2,888 results match your criteria Macromolecular rapid communications[Journal]


Multifunctional Gene Carriers Labeled by Perylene Diimide Derivative as Fluorescent Probe for Tracking Gene Delivery.

Macromol Rapid Commun 2019 Apr 16:e1800916. Epub 2019 Apr 16.

School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, China.

Multifunctional carriers with both gene transfection property and fluorescent tracking function have attracted significant attention in recent years. Herein, a kind of perylene diimide derivative (PDI-C10C8) is conjugated onto the polyethylenimine-g-poly(lactide-co-glycolide)-g-polyethylenimine (PLGA-PEI) polymer to obtain fluorescent multifunctional polymer and micelles (abbreviated as MP). Then, the REDV-G-TAT-G-NLS (TP-G) peptide sequence is grafted onto this MP to obtain multifunctional micelles labeled by perylene diimide derivative (MP-TP-G). Read More

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https://onlinelibrary.wiley.com/doi/abs/10.1002/marc.2018009
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http://dx.doi.org/10.1002/marc.201800916DOI Listing
April 2019
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Using Synergistic Multiple Dynamic Bonds to Construct Polymers with Engineered Properties.

Macromol Rapid Commun 2019 Apr 12:e1900038. Epub 2019 Apr 12.

Research School of Chemistry, Australian National University, Canberra, ACT 2601, Australia.

Dynamic bonds have achieved significant attention for their ability to impart fascinating properties to polymeric materials, such as high mechanical strength, self-healing, shape memory, 3D printability, and conductivity. Incorporating multiple dynamic bonds into polymer systems affords an attractive and efficient approach to endow multiple functionalities. This mini-review focuses on the use of complementary dynamic interactions to control the properties of soft materials. Read More

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http://dx.doi.org/10.1002/marc.201900038DOI Listing

Bioinspired Polymeric Helical and Superhelical Microfibers via Microfluidic Spinning.

Macromol Rapid Commun 2019 Apr 10:e1900111. Epub 2019 Apr 10.

Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, State-Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, 215123, China.

The helix and superhelix play critical roles in the achievement of tissue functions. These fascinating structures have attracted increasing interest due to their potential biomimicking applications. However, continuous and controlled fabrication of these structures, especially the superhelical structures, from various polymers for different practical applications still remains a big challenge. Read More

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http://dx.doi.org/10.1002/marc.201900111DOI Listing

Controlled Growth of Ultra-Thick Polymer Brushes via Surface-Initiated Atom Transfer Radical Polymerization with Active Polymers as Initiators.

Macromol Rapid Commun 2019 Apr 10:e1900078. Epub 2019 Apr 10.

Institute of Nuclear Physics and Chemistry, China Academy of Engineering Physics, Mianyang, 621900, China.

Polymer brushes exhibit functionalities useful for a large number of applications. Often these functionalities only emerge when the polymer brushes have a desired thickness. Here, a significant breakthrough is achieved in the synthesis of ultra-thick polymer brushes using polymer initiators in the approach of surface-initiated atom transfer radical polymerization, yielding polymer brushes with a controllable thickness up to 15. Read More

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http://dx.doi.org/10.1002/marc.201900078DOI Listing

Polyamide/PEG Blends as Biocompatible Biomaterials for the Convenient Regulation of Cell Adhesion and Growth.

Macromol Rapid Commun 2019 Apr 10:e1900091. Epub 2019 Apr 10.

WACKER-Lehrstuhl für Makromolekulare Chemie, Lichtenbergstraße 4, Department of Chemistry, Technische Universität München, 85747, Garching bei München, Germany.

In addition to their established usage in textiles, commodities, and automotives, classical polyamides (nylons) are recently becoming increasingly interesting for applications in (bio)medicine. This fact relies on many prosperous properties of these polymers, which are toughness, resistance, biocompatibility, low immunogenicity, tunable biodegradability, and their similarity to natural peptides (amide bonds). Some nylon-based medical products do already exist for wound treatment applications, implants, and biomolecule-interacting membranes, but the systematic use of these polymers for tissue engineering is-although desired-still to be accomplished. Read More

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http://dx.doi.org/10.1002/marc.201900091DOI Listing

Making Nanocomposites of Hydrophilic and Hydrophobic Polymers Using Gas-Responsive Cellulose Nanocrystals.

Macromol Rapid Commun 2019 Apr 10:e1900114. Epub 2019 Apr 10.

Département de chimie, Université de Sherbrooke, Sherbrooke, J1K 2R1, Canada.

Generally, different surface-functionalized cellulose nanocrystals (CNC) are required for use as nanofillers in hydrophilic and hydrophobic polymers. In the present study, for the first time, a kind of "universal" nanofiller for polymer composites is demonstrated by using CNC grafted with a gas-responsive polymer. CNC are functionalized with pyrene-containing poly(2-(N,N-diethylaminoethyl)methacrylate) (CNC-g-PDEAEMA-Py). Read More

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http://dx.doi.org/10.1002/marc.201900114DOI Listing
April 2019
4.941 Impact Factor

Utilization of 4-(trifluoromethyl)benzenesulfonates as Counter Ions Tunes the Initiator Efficiency of Sophisticated Initiators for the Preparation of Well-Defined poly(2-oxazoline)s.

Macromol Rapid Commun 2019 Apr 10:e1900094. Epub 2019 Apr 10.

Laboratory of Organic and Macromolecular Chemistry (IOMC), Friedrich Schiller University Jena, Humboldtstr. 10, 07743, Jena, Germany.

During the last decades, poly(2-oxazoline)s (POx) have gained increased interest due to their versatility. In particular, cationic ring-opening polymerization (CROP) enables the synthesis of well-defined polymers bearing quantitative α- and ω-functionalities. In contrast to small initiating groups, the introduction of more sophisticated, respectively demanding groups remains challenging. Read More

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http://dx.doi.org/10.1002/marc.201900094DOI Listing

Syndioselective Polymerization of Vinylnaphthalene.

Macromol Rapid Commun 2019 Apr 5:e1900061. Epub 2019 Apr 5.

State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, P. R. China.

Coordination polymerizations of 1-vinylnaphthalene (1VN), 2-vinylnaphthalene (2VN) and 6-methoxy-2-vinylnaphthalene (MVN) are carried out at room temperature by using the half-sandwich scandium precursor FluSiMe Sc(CH SiMe ) (THF) (1) and the constrained geometry configuration rare-earth metal precursors FluCH PyLn(CH SiMe ) (THF) [Flu = C H , Py = C H N; Ln = Sc (2a), n = 0; Ln = Lu (2b), Y(2c), n = 1]. Atactic poly(1VN) and perfect syndiotactic poly(2VN) and poly(MVN) are produced by precursors 2a-2c in a controlled way. Treatment of poly(MVN) with boron tribromide at -20 °C provides a syndiotactic poly(6-hydroxy-2-vinylnaphthalene). Read More

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http://dx.doi.org/10.1002/marc.201900061DOI Listing
April 2019
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Responsive and Degradable Highly Branched Polymers with Hypervalent Iodine(III) Groups at the Branching Points.

Macromol Rapid Commun 2019 Apr 3:e1900073. Epub 2019 Apr 3.

Department of Chemistry, Southern Methodist University, 3215 Daniel Avenue, Dallas, TX, 75275, USA.

A hypervalent (HV) iodine(III)-containing crosslinker, (diacryloyloxyiodo)benzene, is synthesized and its crystal structure is reported. Highly branched polymers with hypervalent iodine(III) groups as the building blocks present at the branching points are synthesized by copolymerization of tert-butyl acrylate and the diacrylate crosslinker (up to 12 mol% vs the monovinyl monomer), under reversible deactivation radical polymerization (iodine transfer polymerization) conditions, which are employed to ensure that the incorporation of the crosslinker into the polymer chains is slow and gradual, that is, to limit the average number of pendant double bonds per chain and delay gelation. The branched polymers with (diacyloxyiodo)benzene-type linkers are responsive and react with monocarboxylic acids, for example, acetic acid, which participate in ligand-exchange reactions with the HV iodine(III) centers, and with reducing agents, for example, tributylphosphine, which reduce iodine(III) to iodine(I); both reactions lead to polymer degradation with the formation of random linear copolymers of tert-butyl acrylate and acrylic acid. Read More

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http://dx.doi.org/10.1002/marc.201900073DOI Listing
April 2019
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4.941 Impact Factor

Polar Side Chain Effects on the Thermoelectric Properties of Benzo[1,2-b:4,5-b']Dithiophene-Based Conjugated Polymers.

Macromol Rapid Commun 2019 Apr 3:e1900082. Epub 2019 Apr 3.

Shenzhen Key Laboratory of Polymer Science and Technology, College of Materials Science and Engineering, Shenzhen University, Shenzhen, 518060, China.

The molecular structure of polymers has a great influence on their thermoelectric properties; however, the relationship between the molecular structure of a polymer and its thermoelectric properties remains unclear. In this work, two benzo[1,2-b:4,5-b']dithiophene (BDT)-based conjugated polymers are designed and synthesized, which contain alkyl side chains or polar side chains. The effects of the polymer side chain on the physicochemical properties are systematically investigated, especially the thermoelectric performance of the polymers after doping with 2,3-dichloro-5,6-dicyano-1,4-benzoquinone and 2,3,5,6-tetrafluoro-7,7,8,8-tetracyanoquinodimethane. Read More

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http://dx.doi.org/10.1002/marc.201900082DOI Listing
April 2019
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Particle Mold Synthesis of Block Copolymer Janus Nanomaterials.

Macromol Rapid Commun 2019 Apr 3:e1900067. Epub 2019 Apr 3.

State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing, 100190, China.

A particle mold synthesis of 2D Janus nanomaterials is proposed by crosslinking of copolymer self-assembled monolayers confined within the mold domains. Onto the silica (SiO ) particle surface, mold domains with functional groups such as imidazole are generated. The model copolymer of polyacrylic acid-block-polystyrene (PAA-b-PS) can be preferentially absorbed onto the domains via electrostatic interactions, forming a self-assembled monolayer. Read More

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http://dx.doi.org/10.1002/marc.201900067DOI Listing
April 2019
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A Highly Crystalline Fluorene-Based Porous Organic Framework with High Photoluminescence Quantum Yield.

Macromol Rapid Commun 2019 Apr 3:e1900060. Epub 2019 Apr 3.

Key Laboratory of Polyoxometalate Science of the Ministry of Education, Faculty of Chemistry, Northeast Normal University, Changchun, 130024, P. R. China.

Using 4-connected pyrene-based building blocks with D symmetry and 2-connected fluorene-based linker with C symmetry, a 2D porous organic framework is obtained via imine condensation, PAF-130. PAF-130 has high crystallinity, permanent, and a high photoluminescence quantum yield, which is as high as 29.5% when dispersed in acetonitrile. Read More

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http://dx.doi.org/10.1002/marc.201900060DOI Listing

Rheological Characterization of Biomaterials Directs Additive Manufacturing of Strontium-Substituted Bioactive Glass/Polycaprolactone Microfibers.

Macromol Rapid Commun 2019 Apr 1:e1900019. Epub 2019 Apr 1.

Institute of Health and Biomedical Innovation (IHBI), Queensland University of Technology (QUT), 60 Musk Ave, Kelvin Grove, QLD, 4059, Australia.

Additive manufacturing via melt electrowriting (MEW) can create ordered microfiber scaffolds relevant for bone tissue engineering; however, there remain limitations in the adoption of new printing materials, especially in MEW of biomaterials. For example, while promising composite formulations of polycaprolactone with strontium-substituted bioactive glass have been processed into large or disordered fibres, from what is known, biologically-relevant concentrations (>10 wt%) have never been printed into ordered microfibers using MEW. In this study, rheological characterization is used in combination with a predictive mathematical model to optimize biomaterial formulations and MEW conditions required to extrude various PCL and PCL/SrBG biomaterials to create ordered scaffolds. Read More

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http://dx.doi.org/10.1002/marc.201900019DOI Listing

Principles of Structural Design of Conjugated Polymers Showing Excellent Charge Transport toward Thermoelectrics and Bioelectronics Applications.

Macromol Rapid Commun 2019 Mar 29:e1800915. Epub 2019 Mar 29.

Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Universitätsstr. 30, Bayreuth, 95440, Germany.

Conjugated polymers, especially their second generation with a donor-acceptor alternating structure, have promising properties. These are suitable for two emerging fields, thermoelectrics and bioelectronics, if appropriate structural designs are implemented. This review aims to give a perspective for the potential and challenges of novel conjugated polymers in such applications. Read More

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http://dx.doi.org/10.1002/marc.201800915DOI Listing

Chlorinated Polymers for Efficient Solar Cells with High Open Circuit Voltage: The Influence of Different Thiazole Numbers.

Macromol Rapid Commun 2019 Mar 29:e1900035. Epub 2019 Mar 29.

CAS Key Laboratory of Bio-based Materials, Qingdao Institute of Bioenergy and Bioprocess Technology, Chinese Academy of Sciences, Qingdao, 266101, China.

The chlorination strategy has gradually become a promising approach to improve the open circuit voltage (V ) in polymer solar cells. In this work, by using an efficient thiazole-induced strategy in a polymer backbone, three thieno[3,4-b]thiophene (TT)-based polymers-PBClTTz-0, PBClTTz-1, and PBClTTz-2-are designed and synthesized with a Cl-substituted benzodithiophene (BDT) moiety and a thiazole unit as a π spacer. As expected, all of the polymers show a desirable open circuit voltage (V ) of >0. Read More

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http://dx.doi.org/10.1002/marc.201900035DOI Listing
March 2019
4.941 Impact Factor

Visible Light Rewritable and Long-Lived Colors in Cholesteric Liquid Crystals: A Facile Co-Doping Strategy.

Macromol Rapid Commun 2019 Mar 27:e1900037. Epub 2019 Mar 27.

Department of Materials Science, Fudan University, Shanghai, 200433, China.

Photoresponsive cholesteric liquid crystals (CLCs) are able to selectively reflect colors upon light exposure. Yet, it still remains a formidable challenge to realize simultaneous rewriting and long-life color in CLCs using visible light. Herein, guided by time dependent density functional theory (TD-DFT) computation, an octafluorinated binaphthyl azobenzene is synthesized to achieve the fast response and long-life color upon visible light exposure. Read More

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http://dx.doi.org/10.1002/marc.201900037DOI Listing
March 2019
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Syndiospecific Coordination Polymerization of Si-H-Containing Styrenes Catalyzed by Scandium Complex and Synthesis of Styrene-Based Triblock Copolymers.

Macromol Rapid Commun 2019 Mar 22:e1900048. Epub 2019 Mar 22.

State Key Laboratory of Fine Chemicals, Liaoning Key Laboratory of Polymer Science and Engineering, Department of Polymer Science and Engineering, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, China.

The controlled syndiospecific polymerization of three Si-H-containing styrenes, that is, 4-(methylhydrosilyl)styrene (FSt-1), 4-(dimethylhydrosilyl)styrene (FSt-2) and 4-(diisopropylhydrosilyl)styrene (FSt-3), is realized in the presence of (C Me SiMe )Sc (CH C H ) (THF)/[Ph C][B(C F ) ]. Then a series of FSt-b-styrene-b-FSt triblock copolymers (FSt-St-FSt) are synthesized facilely via a sequential monomer feeding process (FSt-2, styrene, and FSt-2, respectively) during the polymerization. The syndiotactic polystyrene (sPS) block in the middle endows the copolymer with high melting point above 250 °C, whereas the Si-H groups on monomer FSt-2 introduce functional pendants to the end-blocks (with Si-H content of 31-63 mol%). Read More

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http://dx.doi.org/10.1002/marc.201900048DOI Listing
March 2019
2 Reads
4.941 Impact Factor

Self-Assembly of Giant Polymer Vesicles by Light-Assisted Solid Hydration.

Macromol Rapid Commun 2019 Mar 20:e1900027. Epub 2019 Mar 20.

Max Planck Institute for Polymer Research, Ackermannweg 10, 55126, Mainz, Germany.

An amphiphilic copolymer containing a terminal spiropyran (P-SP) forms giant polymer vesicles when exposed to ultraviolet (UV) light. The process involves photoisomerization of the spiropyran to the corresponding hydrophilic merocyanine isomer, which significantly improves the efficiency of film hydration and facilitates the self-assembly of the polymer in water. Giant vesicles formed by light-assisted hydration have diameters ranging from 5 to 25 micrometers, and can be observed and quantified by confocal fluorescence microscopy. Read More

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http://dx.doi.org/10.1002/marc.201900027DOI Listing

Aminal Protection of Epoxide Monomer Permits the Introduction of Multiple Secondary Amine Moieties at Poly(ethylene glycol).

Macromol Rapid Commun 2019 Mar 20:e1900057. Epub 2019 Mar 20.

Institute of Organic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128, Mainz, Germany.

In contrast to acetal groups, aminal moieties are almost unknown in polymer chemistry. The aminal-protected isopropyl-hexahydro-pyrimidine glycidyl amine (PyGA) for the anionic ring-opening polymerization (AROP) is introduced. The monomer is prepared in a two-step synthesis and can be polymerized in a well-controlled manner under AROP conditions. Read More

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http://dx.doi.org/10.1002/marc.201900057DOI Listing

Reprocessable and Multiple Shape Memory Thermosets with Reconfigurability.

Macromol Rapid Commun 2019 Mar 20:e1900001. Epub 2019 Mar 20.

Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu, 610041, China.

Multiple shape memory thermosets for various engineering applications have been quickly developed in recent years, mainly due to their stable thermomechanical performance, environmental stability, excellent chemical, solvent resistance, etc. However, these thermosets are inherently non-recyclable due to their chemically crosslinked properties, and it is difficult to make the permanent shapes of these thermosets sophisticated and geometrically complex, which significantly restricts a great variety of engineering applications in the industry and technology fields, mainly due to the economic inefficiency and environmental impact. Here, a thermoset with recyclability, multiple shape memory effect (multi-SME), and permanent shape reconfiguration is reported. Read More

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http://dx.doi.org/10.1002/marc.201900001DOI Listing

Tailoring Hexagonal Gibbsite Single Crystal Nanoplatelets for Ethylene Polymerization and Nanocomposite Formation on MAO-Free Heterogeneous Bis(imino)pyridine Iron (II) Catalyst.

Macromol Rapid Commun 2019 Mar 20:e1900015. Epub 2019 Mar 20.

Freiburg Materials Research Center (FMF) and Institute for Macromolecular Chemistry, Albert-Ludwigs-University Freiburg, Stefan-Meier-Strasse 31, D-79104, Freiburg, Germany.

Ultrathin single crystal γ-Al(OH) (Gibbsite) nanoplatelets with average thickness <20 nm and length <800 nm, pretreated with trimethylaluminum (TMA), represent highly efficient activators and supports bis(imino)pyridine iron (II) (FeBIP) complex to produce high density polyethylene (HDPE) as well as gibbsite/HDPE nanocomposites in exceptionally high yields. Opposite to both methylaluminoxane (MAO)-activated homogeneous FeBIP catalyst and heterogenous silica-supported single site catalysts, no addition of MAO is required. At low TMA/Fe = 50 molar ratio, the superior catalyst activity (up to 6500 kg mol h bar ) of FeBIP@TMA@Gibbsite is paralleled by controlled polyethylene particle growth without encountering reactor-fouling problems typical for homogeneous catalysts. Read More

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http://dx.doi.org/10.1002/marc.201900015DOI Listing
March 2019
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High Potential of Aerosol-Made 3D Graphene-Based Composites for Enhanced Energy Storage.

Macromol Rapid Commun 2019 Mar 20:e1800832. Epub 2019 Mar 20.

Resources Utilization Research Center, Korea Institute of Geoscience and Mineral Resources, Daejeon, 34132, Korea.

Recently, many researchers have developed advanced energy storage and energy conversion systems to address the increased demand for energy resources. The performance of these electrochemical energy storage and conversion devices depends considerably on the properties of their unique electrode materials. Among electrode materials, graphene (GR) has attracted much attention due to its unique properties of high flexibility, a large specific surface area, and superior electric conductivity rates that are well-suited to energy storage systems. Read More

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http://dx.doi.org/10.1002/marc.201800832DOI Listing

New Bio-Polyamides from Terpenes: α-Pinene and (+)-3-Carene as Valuable Resources for Lactam Production.

Macromol Rapid Commun 2019 Mar 20:e1800903. Epub 2019 Mar 20.

Fraunhofer IGB, Straubing Branch Bio, Electro and Chemocatalysis BioCat, Schulgasse 11a, 94315, Straubing, Germany.

The synthesis and polymerization of two β-lactams and two ε-lactams derived from the terpenes α-pinene and (+)-3-carene are reported. The new biopolymers can be considered as polyamide 2 (PA2) and polyamide 6 (PA6)-types with aliphatic stereoregular side chains, which lead to remarkable new properties. The macromolecules are investigated by gel permeation chromatography (GPC), nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC), and infrared (IR). Read More

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http://dx.doi.org/10.1002/marc.201800903DOI Listing

Surface Microstructure Regulation of Porous Polymer Microspheres by Volume Contraction of Phase Separation Process in Traditional Suspension Polymerization System.

Macromol Rapid Commun 2019 Mar 12:e1800768. Epub 2019 Mar 12.

School of Applied and Natural Sciences, Northwestern Polytechnical University, Xi'an, 710129, P. R. China.

In the present work, the suspension polymerization method is used for the preparation of porous polymer microspheres with different surface morphology, and the preparation mechanism is systematically expounded. The morphology results show that the smooth, convex, and wrinkled microspheres could be controlled by adjusting the ratio of monomer to porogens. The micelles forming the framework support the "Eggshell," and its size and shape directly affect the morphology of "Eggshell. Read More

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http://dx.doi.org/10.1002/marc.201800768DOI Listing
March 2019
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Rapid Two-Photon Polymerization of an Arbitrary 3D Microstructure with 3D Focal Field Engineering.

Macromol Rapid Commun 2019 Apr 12;40(8):e1900041. Epub 2019 Mar 12.

State Key Laboratory for Mesoscopic Physics, Collaborative Innovation Center of Quantum Matter, Department of Physics, Peking University, Beijing, 100871, China.

Two-photon polymerization is a powerful method for three-dimensional (3D) precision nanofabrication. To facilitate the fabrication speed, for the first time, single-exposure or single-scan two-photon polymerization of an arbitrary 3D microstructure with smaller or larger volume is demonstrated through focal field engineering. The constraints and the initial conditions of the Gerchberg-Saxton algorithm for the retrieval of the incident wavefront are adapted for the shape fidelity and the smoothness of the 3D focal field intensity distribution. Read More

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http://dx.doi.org/10.1002/marc.201900041DOI Listing
April 2019
4.941 Impact Factor

A Three-Armed Polymer with Tunable Self-Assembly and Self-Healing Properties Based on Benzene-1,3,5-tricarboxamide and Metal-Ligand Interactions.

Macromol Rapid Commun 2019 Mar 12:e1800909. Epub 2019 Mar 12.

MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions and Department of Applied Chemistry, School of Science, Northwestern Polytechnical University, Xi'an, 710072, China.

The dynamic nature of supramolecules makes them useful in the fields of smart devices. The combination of multiple dynamic interactions in one material may bring some enhanced properties in mechanical property, self-healing property, or recyclability. Thus, it is significantly meaningful to design new materials with multi-dynamic bonds and clarify their bonding mechanisms. Read More

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http://dx.doi.org/10.1002/marc.201800909DOI Listing
March 2019
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Light-Switching Azo-Copolymers Self-Assembly in Multi-Stationary States.

Macromol Rapid Commun 2019 Mar 7:e1900058. Epub 2019 Mar 7.

School of Optoelectronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China.

In the present research, novel tri-block-copolymers bearing polyethylene glycol (PEG), azobenzene (Azo), and tetra-ortho-methoxy-substituted Azo (mAzo) segments are synthesized and explored. Light-controlled PEG-PmAzo-PAzo self-assemblies switching between multi-stationary states is realized. Under controlling of UV, blue, green, and red light, PEG-PmAzo-PAzo isomerize between 4 photostationary states. Read More

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http://dx.doi.org/10.1002/marc.201900058DOI Listing

Fabrication and Characterization of Reconstituted Silk Microgels for the Storage and Release of Small Molecules.

Macromol Rapid Commun 2019 Apr 6;40(8):e1800898. Epub 2019 Mar 6.

X. Liu, Z. Toprakcioglu, A. J. Dear, Dr. A. Levin, Dr. F. S. Ruggeri, C. G. Taylor, M. Hu, Dr. J. R. Kumita, Dr. M. Andreasen, Prof. C. M. Dobson, Prof. T. P. J. Knowles, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.

Silk fibroin is a natural protein obtained from the Bombyx mori silkworm. In addition to being the key structural component in silkworm cocoons, it also has the propensity to self-assemble in vitro into hierarchical structures with desirable properties such as high levels of mechanical strength and robustness. Furthermore, it is an appealing biopolymer due to its biocompatability, low immunogenicity, and lack of toxicity, making it a prime candidate for biomedical material applications. Read More

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http://dx.doi.org/10.1002/marc.201800898DOI Listing
April 2019
2 Reads

Optical Patterns on Drawn Polyethylene by Direct Laser Writing.

Macromol Rapid Commun 2019 Mar 6:e1800811. Epub 2019 Mar 6.

Eindhoven University of Technology, P.O. Box 513, 5600, MB, Eindhoven, The Netherlands.

Optical patterns are produced on the surface of drawn linear polyethylene containing 2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol (BZT), a photothermal dye, by direct laser writing. The photothermal dye absorbs the UV light and dissipates heat in the polyethylene film. This heat locally results in the melting, shrinking, and recrystallization of PE and the loss of the fibrillar crystalline morphology which is typical for these materials. Read More

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http://dx.doi.org/10.1002/marc.201800811DOI Listing
March 2019
3 Reads

Soft Materials Research at IMRE.

Macromol Rapid Commun 2019 Mar;40(5):e1800914

Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, Innovis #08-03, Singapore, 138634.

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http://dx.doi.org/10.1002/marc.201800914DOI Listing
March 2019
1 Read

pH-Responsive Polymer Nanoparticles for Drug Delivery.

Macromol Rapid Commun 2019 Mar 5:e1800917. Epub 2019 Mar 5.

School of Chemistry, The University of Melbourne, Parkville, Victoria, 3010, Australia.

Stimuli-responsive nanoparticles have the potential to improve the delivery of therapeutics to a specific cell or region within the body. There are many stimuli that have shown potential for specific release of cargo, including variation of pH, redox potential, or the presence of enzymes. pH variation has generated significant interest for the synthesis of stimuli-responsive nanoparticles because nanoparticles are internalized into cells via vesicles that are acidified. Read More

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http://dx.doi.org/10.1002/marc.201800917DOI Listing
March 2019
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Aqueous Synthesis of Multi-Carbon Dot Cross-Linked Polyethyleneimine Particles with Enhanced Photoluminescent Properties.

Macromol Rapid Commun 2019 Mar 4:e1800869. Epub 2019 Mar 4.

Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, P. R. China.

Heavy-metal-free fluorescent nanoparticles with high photostability and low toxicity are highly desirable as imaging probes for biological applications. Here, a novel synthetic strategy to prepare ultrabright multi-carbon dot cross-linked PEI particles, namely CDs@PEI, through self-assembly of hydrophobically modified PEI and in situ generations of carbon dots within residual monomer-swollen micelles is reported. The resulting particles consist of numerous carbon dots, which are individually and homogeneously embedded within the PEI network, and have an average hydrodynamic diameter of approximately 100 nm with ζ-potential above +35 mV. Read More

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http://dx.doi.org/10.1002/marc.201800869DOI Listing
March 2019
2 Reads
4.941 Impact Factor

Convenient Access to α-Amino-ω-Hydroxyl Heterobifunctional PEG and PPO via a Sacrificial Hexahydro-Triazine Star Strategy.

Macromol Rapid Commun 2019 Mar 1:e1900020. Epub 2019 Mar 1.

Institute of Organic Chemistry, Johannes Gutenberg University, Duesbergweg 10-14, 55128, Mainz, Germany.

The anionic ring opening polymerizations of ethylene oxide (EO) and propylene oxide (PO) are performed by using 1,3,5-triethanol hexahydro-1,3,5-triazine (TrAz) as a "sacrificial" trifunctional initiator. Well-defined three-arm star polymers are obtained with a narrow molecular weight distribution (M /M < 1.1). Read More

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http://dx.doi.org/10.1002/marc.201900020DOI Listing
March 2019
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Smart Delivery Systems Based on Poly(glycidyl methacrylate)s-Coated Organic/Inorganic Core-Shell Nanohybrids.

Authors:
Li-Li Tan Li Shang

Macromol Rapid Commun 2019 Feb 28:e1800879. Epub 2019 Feb 28.

State Key Laboratory of Solidification Processing, Center for Nano Energy Materials, School of Materials Science and Engineering, Northwestern Polytechnical University and Shaanxi Joint Laboratory of Graphene (NPU), Xi'an, 710072, P. R. China.

Smart delivery systems have gained momentum over the last few decades due to their potential to realize enhanced therapeutic efficacy. Poly(glycidyl methacrylate)s (PGMAs), which spring up like mushrooms, have drawn great attention in the theranostics field, especially in multifunctional theranostic systems. The marriage of PGMAs with functional inorganic cores is expected to integrate diagnosis (e. Read More

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http://dx.doi.org/10.1002/marc.201800879DOI Listing
February 2019
3 Reads

Near-Infrared-Induced Cationic Polymerization Initiated by Using Upconverting Nanoparticles and Titanocene.

Macromol Rapid Commun 2019 Feb 28:e1900047. Epub 2019 Feb 28.

School of Chemical & Materials Engineering, Jiangnan University, Wuxi, Jiangsu, 214122, China.

A new near-infrared (NIR)-sensitized photoinitiating system for free-radical-promoted cationic polymerization of oxirane and vinyl monomers such as cyclohexene oxide, and n-butyl vinyl ether (BVE), and N-vinyl carbazole (NVC) is described. A three-component photoinitiating system consists of upconverting nanoparticles (UCNPs), titanium-complex free radical photoinitiator (Irgacure 784, titanocene), and diphenyl iodonium hexafluorophosphate (Ph I PF ). Upon NIR laser irradiation at 980 nm, the radicals generated from titanocene by the visible light emitted by UCNP abstract hydrogen or add to the monomer, forming electron donor radicals that can be oxidized by iodonium salt to initiate cationic polymerization. Read More

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http://dx.doi.org/10.1002/marc.201900047DOI Listing
February 2019
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A Novel Reprocessable and Recyclable Acrylonitrile-Butadiene Rubber Based on Dynamic Oxime-Carbamate Bond.

Macromol Rapid Commun 2019 Feb 28:e1800733. Epub 2019 Feb 28.

Northwestern Polytechnical University, School of Science, MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions, Xi'an 710072, Shaanxi, China.

The covalent cross-linked rubber has outstanding mechanical properties and chemical resistance, making it possible for a wide range of applications. Towards efforts to resource waste and environmental pollution, rubber recycling is a concerning problem. However, it is a big challenge to endow the most widely used commercial rubber systems with recyclability. Read More

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http://dx.doi.org/10.1002/marc.201800733DOI Listing
February 2019
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The Trimerization of Isocyanate-Functionalized Prepolymers: An Effective Method for Synthesizing Well-Defined Polymer Networks.

Macromol Rapid Commun 2019 Feb 28:e1800867. Epub 2019 Feb 28.

Technical Medical Centre, Faculty of Science and Technology, Department of Biomaterials Science and Technology, University of Twente, P.O. Box 217, 7500, AE Enschede, The Netherlands.

For the study of polymer networks, having access to polymer networks with a controlled and well-defined microscopic network structure is of great importance. However, typically, such networks are difficult to synthesize. In this work, a simple, effective, and widely applicable method is presented for synthesizing polymer networks with a well-defined network structure. Read More

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http://dx.doi.org/10.1002/marc.201800867DOI Listing
February 2019
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Organic Molecule-Driven Polymeric Actuators.

Macromol Rapid Commun 2019 Apr 27;40(7):e1800896. Epub 2019 Feb 27.

Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, Stockholm, 10691, Sweden.

Inspired by the motions of plant tissues in response to external stimuli, significant attention has been devoted to the development of actuating polymeric materials. In particular, polymeric actuators driven by organic molecules have been designed due to their combined superiorities of tunable functional monomers, designable chemical structures, and variable structural anisotropy. Here, the recent progress is summarized in terms of material synthesis, structure design, polymer-solvent interaction, and actuating performance. Read More

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http://doi.wiley.com/10.1002/marc.201800896
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http://dx.doi.org/10.1002/marc.201800896DOI Listing
April 2019
3 Reads

Facile Access to Completely Deuterated Single-Chain Nanoparticles Enabled by Intramolecular Azide Photodecomposition.

Macromol Rapid Commun 2019 Feb 25:e1900046. Epub 2019 Feb 25.

Centro de Física de Materiales (CSIC, UPV/EHU)-MPC Materials Physics Center, Paseo Manuel de Lardizabal 5, 20018, San Sebastian, Spain.

Access to completely deuterated single-chain nanoparticles (dSCNPs) has remained an unresolved issue. Herein, the first facile and efficient procedure to produce dSCNPs is reported, which comprises: i) the use of commercially available perdeuterated cyclic ether monomers as starting reagents, ii) a ring-opening copolymerization process performed in bulk to produce a neat dSCNP precursor, iii) a standard azidation reaction to decorate this precursor with azide moieties, and iv) a facile intramolecular azide photodecomposition step carried out under UV irradiation at high dilution providing with highly valuable, completely deuterated soft nano-objects from the precursor. dSCNPs are used to investigate by means of neutron-scattering measurements the form factor (radius of gyration, scaling exponent) of polyethylene oxide (PEO) chains in nanocomposites with different amounts of dSCNPs. Read More

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http://dx.doi.org/10.1002/marc.201900046DOI Listing
February 2019
2 Reads

Constructing Artificial Light-Harvesting Systems by Covalent Alignment of Aggregation-Induced Emission Molecules.

Macromol Rapid Commun 2019 Feb 21:e1800892. Epub 2019 Feb 21.

State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, 2699 Qianjin Street, Changchun, 130012, China.

The characteristics of chloroplasts harvesting solar energy and conducting energy transfer have inspired chemists to mimic similar processes. However, accurate manipulation to gain regularly displayed antenna chromophores in mimicking chloroplasts is a great challenge. Herein, a rational design is presented that combines orderly arranged chromophores with aggregation-induced emission (AIE) to develop artificial light-harvesting systems. Read More

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http://dx.doi.org/10.1002/marc.201800892DOI Listing
February 2019
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Stiffness-Changing of Polymer Nanocomposites with Cellulose Nanocrystals and Polymeric Dispersant.

Macromol Rapid Commun 2019 Feb 20:e1800910. Epub 2019 Feb 20.

Adolphe Merkle Institute, University of Fribourg, Chemin des Verdiers 4, CH-1700, Fribourg, Switzerland.

Bio-inspired, water-responsive, mechanically adaptive nanocomposites are reported based on cellulose nanocrystals (CNCs), poly(ethylene oxide-co-epichlorohydrin) (EO-EPI), and a small amount of poly(vinyl alcohol) (PVA), which is added to aid the dispersion of the CNCs. In the dry state, the CNCs form a reinforcing network within the polymer matrix, and the substantial stiffness increase relative to the neat polymer is thought to be the result of hydrogen-bonding interactions between the nanocrystals. Exposure to water, however, causes a large stiffness reduction, due to competitive hydrogen bonding of water molecules and the CNCs. Read More

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http://dx.doi.org/10.1002/marc.201800910DOI Listing
February 2019
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3D Printing of Photocuring Elastomers with Excellent Mechanical Strength and Resilience.

Macromol Rapid Commun 2019 Apr 19;40(8):e1800873. Epub 2019 Feb 19.

State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou, 730000, China.

Three-dimensional (3D) printing elastomers, as a combination of transformative technology and widely used materials, have received great demand in many fields. However, commercial photocuring elastomer inks for 3D printing usually exhibit poor mechanical strength, inferior resilience, and lower elongation at break. In this study, photocuring inks that can be employed for digital light processing 3D printing are developed with acryloyl-modified polyethylene glycol (Acryl@PEG). Read More

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http://dx.doi.org/10.1002/marc.201800873DOI Listing
April 2019
4 Reads

Asymmetric Wide-Bandgap Polymers Simultaneously Improve the Open-Circuit Voltage and Short-Circuit Current for Organic Photovoltaics.

Macromol Rapid Commun 2019 Apr 19;40(8):e1800906. Epub 2019 Feb 19.

Beijing National Laboratory for Molecular Science, CAS State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry Chinese Academy of Science, Beijing, 100190, P. R. China.

A trade-off between open-circuit voltage (V ) and high short-circuit (J ) becomes one of the most vital problems limiting further improvement in polymer solar cells' (PSCs) efficiency. In this work, two asymmetric polymer donors PBDT-F-2TC and PBDT-SF-2TC are designed and synthesized. When blended with a state-of-the-art acceptor IT-4F with low lowest-unoccupied molecular orbital level, simultaneously high V (up to 0. Read More

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http://dx.doi.org/10.1002/marc.201800906DOI Listing
April 2019
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Nanoscale Film Morphology and n-Type Digital Memory Characteristics of π-Conjugated Donor-Acceptor Alternating Copolymer Based on Thiophene and Thiadiazole Units.

Macromol Rapid Commun 2019 Apr 19;40(8):e1900005. Epub 2019 Feb 19.

Department of Chemistry, Division of Advanced Materials Science, Pohang Accelerator Laboratory and Polymer Research Institute, Pohang University of Science and Technology, Pohang, 37673, Republic of Korea.

Various molecular weight π-conjugated donor-acceptor polymers based on thiadiazole and thiophene units are investigated with respect to nanoscale film morphology and digital memory performance. Interestingly, all polymers reveal excellent n-type digital permanent memory characteristics, which are governed by the combination of Ohmic and trap-limited space charge limited conductions via a hopping process using thiadiazole and thiophene units as charge traps and stepping stones. The digital memory performance is significantly influenced by the film morphology details that vary with the polymer molecular weight as well as the film thickness. Read More

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http://dx.doi.org/10.1002/marc.201900005DOI Listing
April 2019
2 Reads

Redox-Responsive Nanogel with Intracellular Reconstruction and Programmable Drug Release for Targeted Tumor Therapy.

Macromol Rapid Commun 2019 Apr 19;40(8):e1800824. Epub 2019 Feb 19.

School of Chemical Engineering and Technology, Shanxi Key Laboratory of Energy Chemical Process Intensification, Institute of Polymer Science in Chemical Engineering, Xi'an Jiao Tong University, Xi'an, China, 710049.

A tumor-selective drug delivery nanogel with redox-responsive size swelling and co-instantaneous drug release is developed. The nanogel is formed by poly(ethylene glycol) diglycidyl ether and cystamine double crosslinked hyaluronic acid (HA). The disulfide bond in cystamine (Cys) is in charge of the responsiveness, while the compact polymer network turns the nanogel a capsule for effective drug loading. Read More

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http://dx.doi.org/10.1002/marc.201800824DOI Listing
April 2019
3 Reads

Effective Separation of Enantiomers Based on Novel Chiral Hierarchical Porous Metal-Organic Gels.

Macromol Rapid Commun 2019 Apr 13;40(8):e1800862. Epub 2019 Feb 13.

College of Chemistry, Chemical Engineering and Materials Science, Key Laboratory of Molecular and Nano Probes, Ministry of Education, Collaborative Innovation Center of Functionalized Probes for Chemical Imaging in Universities of Shandong, Institute of Molecular and Nano Science, Shandong Normal University, Jinan, 250014, P. R. China.

Metal-organic gel (MOG) matrices with tunable pore sizes ranging from micropore to macropore, derived from microporous metal-organic coordination polymers (PCPs), has attracted great attention for their enhanced pore accessibility compared with the multifunctional PCP materials themselves. The enhanced pore accessibility of chiral MOGs is especially imperative for mass transfer applications, including enantioseparations and purifications. Here, for the first time, a novel hierarchical porous MOG-coated SiO , derived from a chiral metal-organic coordination polymer, is employed as chiral stationary phase for effective high-performance liquid chromatography (HPLC) separation of enantiomers. Read More

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http://dx.doi.org/10.1002/marc.201800862DOI Listing

Functional Brush Poly(2-ethyl-2-oxazine)s: Synthesis by CROP and RAFT, Thermoresponsiveness and Grafting onto Iron Oxide Nanoparticles.

Macromol Rapid Commun 2019 Feb 12:e1800911. Epub 2019 Feb 12.

ARC Centre of Excellence in Convergent Bio-Nano Science & Technology, Monash Institute of Pharmaceutical Sciences, Monash University, Parkville, VIC, 3052, Australia.

Brush polymers are highly functional polymeric materials combining the properties of different polymer classes and have found numerous applications, for example, in nanomedicine. Here, the synthesis of functional phosphonate-ester-bearing brush polymers based on poly(2-oxazine)s is reported through a combination of cationic ring-opening polymerization (CROP) of 2-ethyl-2-oxazine and reversible addition-fragmentation chain transfer (RAFT) polymerization. In this way, a small library of well-defined (Đ ≤ 1. Read More

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http://dx.doi.org/10.1002/marc.201800911DOI Listing
February 2019
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Ultraporous Membranes Electrospun from Nonsolvent-Induced Phase-Separated Ternary Systems.

Macromol Rapid Commun 2019 Feb 12:e1800880. Epub 2019 Feb 12.

Département de Génie Mécanique, École de Technologie Supérieure, 1100 rue Notre-Dame Ouest, Montréal, Québec, H3C 1K3, Canada.

Electrospinning of nonsolvent-induced phase-separated ternary (NIPST) systems has gained a lot of interest due to its potential to produce (nano)fibers, which are superficially and internally porous with nanoscale surface roughness. Membranes produced from such systems are expected to have a high specific surface area (SSA; e.g. Read More

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http://dx.doi.org/10.1002/marc.201800880DOI Listing
February 2019
4 Reads

Flaw-Insensitive Hydrogels under Static and Cyclic Loads.

Macromol Rapid Commun 2019 Apr 10;40(8):e1800883. Epub 2019 Feb 10.

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA.

New applications of hydrogels draw growing attention to the development of tough hydrogels. Most tough hydrogels are designed through incorporating large energy dissipation from breaking sacrificial bonds. However, these hydrogels still fracture under prolonged cyclic loads with the presence of even small flaws. Read More

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http://dx.doi.org/10.1002/marc.201800883DOI Listing
April 2019
2 Reads

Non-Tacky Fluorinated and Elastomeric STEM Networks.

Macromol Rapid Commun 2019 Feb 10:e1800876. Epub 2019 Feb 10.

Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, PA, 15213, USA.

Soft, elastomeric, non-tacky polymer networks are synthesized by reversible deactivation radical polymerization (RDRP). First, the pristine, structurally tailored and engineered macromolecular (STEM) networks are synthesized by reversible addition-fragmentation chain transfer (RAFT) polymerization and incorporated an atom transfer radical polymerization (ATRP) inimer into the network. Subsequently, poly(n-butyl acrylate) (PBA) and/or poly(octafluoropentyl acrylate) (POFPA) side chains are grafted from the network by photo-induced ATRP. Read More

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http://dx.doi.org/10.1002/marc.201800876DOI Listing
February 2019
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