68 results match your criteria plasticization resistance

Engineering plasticization resistant gas separation membranes using metal-organic nanocapsules.

Chem Sci 2020 Apr 15;11(18):4687-4694. Epub 2020 Apr 15.

School of Physical Science and Technology, ShanghaiTech University Shanghai 201210 China

Membrane technologies hold great potential for industrial gas separation. Nevertheless, plasticization, a common phenomenon that is responsible for the loss of gas pair selectivity and the decrease of membrane lifespan, is one of the top challenges withholding the deployment of advanced membrane materials in realistic applications. Here, we report a highly generalizable approach, that utilizes PgCCu, a copper metal-organic nanocapsule (MONC) containing 24 open metal sites (OMSs) as a multi-dentate node to coordinatively crosslink polymers. Read More

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Highly Thermal-Wet Comfortable and Conformal Silk-Based Electrodes for On-Skin Sensors with Sweat Tolerance.

ACS Nano 2021 Jun 10;15(6):9955-9966. Epub 2021 Jun 10.

Innovative Centre for Flexible Devices (iFLEX), Max Planck-NTU Joint Lab for Artificial Senses, School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore.

Noninvasive and seamless interfacing between the sensors and human skin is highly desired for wearable healthcare. Thin-film-based soft and stretchable sensors can to some extent form conformal contact with skin even under dynamic movements for high-fidelity signals acquisition. However, sweat accumulation underneath these sensors for long-term monitoring would compromise the thermal-wet comfort, electrode adherence to the skin, and signal fidelity. Read More

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Metal-Free Multilayer Hybrid PENG Based on Soft Electrospun/-Sprayed Membranes with Cardanol Additive for Harvesting Energy from Surgical Face Masks.

ACS Appl Mater Interfaces 2021 May 25;13(17):20606-20621. Epub 2021 Apr 25.

Center for Biomolecular Nanotechnologies, Istituto Italiano di Tecnologia, 73010 Arnesano (Lecce), Italy.

Disposable surgical face masks are usually used by medical/nurse staff but the current Covid-19 pandemic has caused their massive use by many people. Being worn closely attached to the people's face, they are continuously subjected to routine movements, i.e. Read More

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Plasticized Sodium-Ion Conducting PVA Based Polymer Electrolyte for Electrochemical Energy Storage-EEC Modeling, Transport Properties, and Charge-Discharge Characteristics.

Polymers (Basel) 2021 Mar 5;13(5). Epub 2021 Mar 5.

Centre for Foundation Studies in Science, University of Malaya, Kuala Lumpur 50603, Malaysia.

This report presents the preparation of plasticized sodium ion-conducting polymer electrolytes based on polyvinyl alcohol (PVA)via solution cast technique. The prepared plasticized polymer electrolytes were utilized in the device fabrication of electrical double-layer capacitors (EDLCs). On an assembly EDLC system, cyclic voltammetry (CV), electrical impedance spectroscopy (EIS), linear sweep voltammetry (LSV), transfer number measurement (TNM) and charge-discharging responses were performed. Read More

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Cellulose acetate-based membranes by interfacial engineering and integration of ZIF-62 glass nanoparticles for CO separation.

J Hazard Mater 2021 08 13;415:125639. Epub 2021 Mar 13.

Department of Chemical and Environmental Engineering, Faculty Science and Egineering, University of Nottingham, Malaysia, 43500 Semenyih, Selangor Darul Ehsan, Malaysia. Electronic address:

Composite membranes typically used for gas separation are susceptible to interfacial voids and CO plasticization which adversely affects the gas permeation performance. This paper evaluates routes towards the enhancement of CO permeation performance and CO plasticization resistance of composite membranes using non-stoichiometric ZIF-62 MOF glass and cellulose acetate (CA). Single and mixed gas permeation results, obtained with CO and CH, demonstrate that the presence of ZIF-62 glass in CA polymer enhanced the CO permeability and CO/CH ideal selectivity from 15. Read More

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Automotive Steel with a High Product of Strength and Elongation used for Cold and Hot Forming Simultaneously.

Materials (Basel) 2021 Feb 27;14(5). Epub 2021 Feb 27.

School of Materials Science and Engineering, Anhui University of Technology, Maanshan 243002, China.

A low-cost and easy-to-produce C-Mn-Cr automotive steel for both cold and hot forming is presented in this paper. The alloying element Cr was used to replace Mn in medium-Mn steel and instead of B in hot-formed steel, in order to achieve microstructure control and hardenability improvement, replacing the residual austenite-enhanced plasticization with multidimensional enhanced plasticization through multiphase microstructure design, grain refinement, and dispersion enhancement of second-phase particles. The products of strength and elongation for the cold-formed and hot-formed steel were 20 GPa·% and 18 GPa·%, respectively, while the tensile strengths were more than 1000 MPa and 1500 MPa, respectively. Read More

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February 2021

Coal Fly Ash Derived Silica Nanomaterial for MMMs-Application in CO/CH Separation.

Membranes (Basel) 2021 Jan 21;11(2). Epub 2021 Jan 21.

Faculty of Applied Chemistry and Materials Science, Politehnica University of Bucharest, 1-7 Polizu Street, 011061 Bucharest, Romania.

In order to obtained high selective membrane for industrial applications (such as natural gas purification), mixed matrix membranes (MMMs) were developed based on polysulfone as matrix and MCM-41-type silica material (obtained from coal fly ash) as filler. As a consequence, various quantities of filler were used to determine the membranes efficiency on CO/CH separation. The coal fly ash derived silica nanomaterial and the membranes were characterized in terms of thermal stability, homogeneity, and pore size distribution. Read More

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January 2021

An overview on plasticized biodegradable corn starch-based films: the physicochemical properties and gelatinization process.

Crit Rev Food Sci Nutr 2021 Jan 6:1-11. Epub 2021 Jan 6.

State Key Laboratory of Biobased Material and Green Papermaking, Qilu University of Technology, Shandong Academy of Sciences, Jinan, China.

With increasing awareness of environmental protection, petroleum-based raw materials are continuously decreasing, which in turn necessitated the development of eco-friendly sustainable biomaterials, as alternative strategy. Starch could be an ideal substitute. Corn starch has been used as a renewable material for development of biodegradable packaging, owing to great varieties, low cost, large-scale industrial production, and good films forming properties. Read More

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January 2021

Mechanical and Crack-Sensing Capabilities of Mode-I Joints with Carbon-Nanotube-Reinforced Adhesive Films under Hydrothermal Aging Conditions.

Nanomaterials (Basel) 2020 Nov 19;10(11). Epub 2020 Nov 19.

Materials Science and Engineering Area, Escuela Superior de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, Calle Tulipán s/n, 28933 Móstoles, Spain.

The fracture behavior and crack sensing of mode-I joints with carbon nanotube (CNT)-reinforced adhesive films were explored in this paper under hydrothermal aging conditions. The measured fracture energy of CNT-reinforced joints in grit blasting conditions is higher for non-aged samples than for neat adhesive joints (around 20%) due to the nanofiller toughening and crack bridging effects. However, in the case of brushed surface-treated adherents, a drastic decrease is observed with the addition of CNTs (around 70%) due to the enhanced tribological properties of the nanofillers. Read More

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November 2020

Impacts of Multilayer Hybrid Coating on PSF Hollow Fiber Membrane for Enhanced Gas Separation.

Membranes (Basel) 2020 Nov 11;10(11). Epub 2020 Nov 11.

Department of Chemical Engineering, Industrial Membrane Research Institute, University of Ottawa, 161 Louis Pasteur Street, P.O. Box 450, Station A, Ottawa, ON K1N 6N5, Canada.

One of the most critical issues encountered by polymeric membranes for the gas separation process is the trade-off effect between gas permeability and selectivity. The aim of this work is to develop a simple yet effective coating technique to modify the surface properties of commonly used polysulfone (PSF) hollow fiber membranes to address the trade-off effect for CO/CH and O/N separation. In this study, multilayer coated PSF hollow fibers were fabricated by incorporating a graphene oxide (GO) nanosheet into the selective coating layer made of polyether block amide (Pebax). Read More

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November 2020

High performance compatible thiazole-based polymeric blend cellulose acetate membrane as selective CO absorbent and molecular sieve.

Carbohydr Polym 2021 Jan 14;252:117215. Epub 2020 Oct 14.

Department of Applied Chemistry, Faculty of Chemistry, Kharazmi University, Mofatteh Avenue 49, 15719-14911 Tehran, Iran. Electronic address:

Green blend membranes comprise of high thermal resistance ortho-linked thiazole-based polyimine (PM-4) including thioether linkage were fabricated in combination of glassy cellulose acetate (CA). The thermal stabilities of PMs were examined using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). Morphological aspects and functional groups of the membranes were investigated via field emission scanning electron microscopy (FESEM) and Fourier transform infrared spectroscopy-attenuated total reflectance (FTIR-ATR) analysis respectively. Read More

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January 2021

Effects of Hydrothermal Aging of Carbon Fiber Reinforced Polycarbonate Composites on Mechanical Performance and Sand Erosion Resistance.

Polymers (Basel) 2020 Oct 23;12(11). Epub 2020 Oct 23.

National Engineering Research Center for Advanced Polymer Processing Technology, Zhengzhou University, Zhengzhou 450002, China.

Carbon fiber reinforced polycarbonate (CF/PC) composites have attracted attention for their excellent performances. However, their performances are greatly affected by environmental factors. In this work, the composites were exposed to hydrothermal aging to investigate the effects of a hot and humid environment. Read More

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October 2020

Plasticization Effect of Poly(Lactic Acid) in the Poly(Butylene Adipate--Terephthalate) Blown Film for Tear Resistance Improvement.

Polymers (Basel) 2020 Aug 24;12(9). Epub 2020 Aug 24.

Department of Polymer Science and Engineering, Kyungpook National University, Daegu 41566, Korea.

The mechanical properties and tear resistance of an ecofriendly flexible packaging film, i.e., poly(lactic acid) (PLA)/poly (butylene adipate--terephthalate) (PBAT) film, were investigated via a blown film extrusion process. Read More

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Thromboresistance of Polyurethanes Modified with PEO-Silane Amphiphiles.

Macromol Biosci 2020 12 18;20(12):e2000193. Epub 2020 Aug 18.

Department of Biomedical Engineering, Texas A&M University, College Station, TX, 77843, USA.

Surface-induced thrombosis is problematic in blood-contacting devices composed of silicones or polyurethanes (PUs). Poly(ethylene oxide)-silane amphiphiles (PEO-SA) are previously shown effective as surface modifying additives (SMAs) in silicones for enhanced thromboresistance. This study investigates PEO-SAs as SMAs in a PU at various concentrations: 5, 10, 25, 50, and 100 µmol g PU. Read More

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December 2020

Plasticization Effect of Bio-Based Plasticizers from Soybean Oil for Tire Tread Rubber.

Polymers (Basel) 2020 Mar 9;12(3). Epub 2020 Mar 9.

State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

Modified soybean oil (MSO) is synthesized from soybean oil (SO) and sulfur, aiming to reduce the double bond quantity of SO and avoid harmful effects on the crosslink density and mechanical properties of rubber. MSO modified with different weight percentages of sulfur is then used to plasticize tire tread rubber (TR). It is found that the crosslink density and modulus of MSO- plasticized rubber are significantly improved compared with that of SO-plasticized TR. Read More

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Preparation and Characterization of Edible Dialdehyde Carboxymethyl Cellulose Crosslinked Feather Keratin Films for Food Packaging.

Polymers (Basel) 2020 Jan 8;12(1). Epub 2020 Jan 8.

Green Chemical Engineering Institute, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, Guangdong, China.

The development of edible films based on the natural biopolymer feather keratin (FK) from poultry feathers is of great interest to food packaging. Edible dialdehyde carboxymethyl cellulose (DCMC) crosslinked FK films plasticized with glycerol were prepared by a casting method. The effect of DCMC crosslinking on the microstructure, light transmission, aggregate structure, tensile properties, water resistance and water vapor barrier were investigated. Read More

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January 2020

Coating with chitosan-based edible films for mechanical/biological protection of strawberries.

Int J Biol Macromol 2020 May 11;151:1004-1011. Epub 2019 Nov 11.

Department of Chemical Engineering, Institute of Technological and Exact Sciences - ICTE, Federal University of Triângulo Mineiro (UFTM), 1250 Randolfo Borges Júnior Avenue, Uberaba Zip code 38064-200, MG, Brazil. Electronic address:

The present work reports the development of chitosan-based films for application as protective layer for natural foods such as fruits and vegetables. Chitosan is a biopolymer known for its antibacterial and antifungal properties that when combined with its biocompatibility and biodegradability can be widely applied in areas such as cosmetic, pharmaceutical and food industry. In this work, thin films based on chitosan were obtained by the drop-casting method using glycerol to enhance elasticity and hydrophobic character. Read More

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Study on the compatible interface of bamboo fiber/polylactic acid composites by in-situ solid phase grafting.

Int J Biol Macromol 2019 Dec 3;141:325-332. Epub 2019 Sep 3.

College of Materials Science and Engineering, Central South University of Forestry and Technology, 410004 Changsha, PR China. Electronic address:

The in-situ reactive interfacial compatibilization and properties of polylactic acid-g-bamboo fiber (PLA-g-BF)/polylactic acid (PLA) composites, produced by blending with a three-component plasticizer, glycerol/formamide/tributyl citrate, were investigated. The PLA-g-BF/PLA composites were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), differential scanning calorimeter (DSC), thermal gravimetric analyzer (TGA) and rotational rheometer, and the bending, tensile, and water resistance properties were also tested. The bending strength and elongation at break of PLA-g-BF/PLA composite reached 35. Read More

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December 2019

Designing Rosin-Based Plasticizers: Effect of Differently Branched Chains on Plasticization Performance and Solvent Resistance of Flexible Poly(vinyl chloride) Films.

ACS Omega 2019 Feb 13;4(2):3178-3187. Epub 2019 Feb 13.

Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry (CAF); Key Lab. of Biomass Energy and Material, Jiangsu Province; Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Nanjing Forestry University; Key and Open Lab. of Forest Chemical Engineering, SFA; National Engineering Lab. for Biomass Chemical Utilization, 16 Suojin North Road, Nanjing 210042, Jiangsu Province, P. R. China.

In the present study, we report a strategy to prepare rosin-based plasticizers with differently branched chains, which have the same benzene ring and similar alkane structure compared to phthalate plasticizers. Castor oil methyl ester, cardanol, and triethyl citrate were reacted with the chemical structure of rosin-based plasticizers. Rosin-based plasticizers with differently branched chains as alternative plasticizers for preparing phthalate-free flexible poly(vinyl chloride) films. Read More

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February 2019

Plasticized Cellulosic Films by Partial Esterification and Welding in Low-Concentration Ionic Liquid Electrolyte.

Biomacromolecules 2019 05 29;20(5):2105-2114. Epub 2019 Apr 29.

Department of Bioproducts and Biosystems, School of Chemical Engineering , Aalto University , PO Box 16300, FIN-00076 Aalto , Espoo , Finland.

Alternatives to petroleum-based plastics are of great significance not only from the point of view of their scientific and practical impact but to reduce the environmental footprint. Inspired by the composition and structure of wood's cell walls, we used phenolic acids to endow cellulosic fibers with new properties. The fiber dissolution and homogeneous modification were performed with a recyclable ionic liquid (IL) (tetrabutylammonium acetate ([N][OAc]):dimethyl sulfoxide) to attain different levels of reaction activity for three phenolic acids ( p-hydroxybenzoic acid, vanillic acid, and syringic acid). Read More

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Polymers with Side Chain Porosity for Ultrapermeable and Plasticization Resistant Materials for Gas Separations.

Adv Mater 2019 May 9;31(21):e1807871. Epub 2019 Apr 9.

Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Polymer membranes with ultrahigh CO permeabilities and high selectivities are needed to address some of the critical separation challenges related to energy and the environment, especially in natural gas purification and postcombustion carbon capture. However, very few solution-processable, linear polymers are known today that access these types of characteristics, and all of the known structures achieve their separation performance through the design of rigid backbone chemistries that concomitantly increase chain stiffness and interchain spacing, thereby resulting in ultramicroporosity in solid-state chain-entangled films. Herein, the separation performance of a porous polymer obtained via ring-opening metathesis polymerization is reported, which possesses a flexible backbone with rigid, fluorinated side chains. Read More

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Effect of Polyethylene Glycol Content and Molar Mass on Injection Molding of Hydroxypropyl Methylcellulose Acetate Succinate-Based Gastroresistant Capsular Devices for Oral Drug Delivery.

Polymers (Basel) 2019 Mar 19;11(3). Epub 2019 Mar 19.

Dipartimento di Scienze Farmaceutiche, Sezione di Tecnologia e Legislazione Farmaceutiche "Maria Edvige Sangalli", Università degli Studi di Milano, 20133 Milan, Italy.

Capsular devices for oral drug delivery were recently proposed and manufactured by injection molding (IM) as an evolution of traditional reservoir systems comprising a core and a functional coating. IM allowed the fabrication of capsule shells with release-controlling features based on the employed materials and the design characteristics. These features are independent of the drug, with significant savings in development time and costs. Read More

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Synthesis and Gas-Permeation Characterization of a Novel High-Surface Area Polyamide Derived from 1,3,6,8-Tetramethyl-2,7-diaminotriptycene: Towards Polyamides of Intrinsic Microporosity (PIM-PAs).

Polymers (Basel) 2019 Feb 19;11(2). Epub 2019 Feb 19.

Functional Polymer Membranes Group, Advanced Membranes and Porous Materials Center, Division of Physical Sciences and Engineering, King Abdullah University of Science and Technology, Thuwal 23955-6900, Saudi Arabia.

A triptycene-based diamine, 1,3,6,8-tetramethyl-2,7-diamino-triptycene (TMDAT), was used for the synthesis of a novel solution-processable polyamide obtained via polycondensation reaction with 4,4'-(hexafluoroisopropylidene)bis(benzoic acid) (6FBBA). Molecular simulations confirmed that the tetrasubstitution with -methyl groups in the triptycene building block reduced rotations around the C⁻N bond of the amide group leading to enhanced fractional free volume. Based on N₂ sorption at 77 K, 6FBBA-TMDAT revealed microporosity with a Brunauer⁻Emmett⁻Teller (BET) surface area of 396 m² g; to date, this is the highest value reported for a linear polyamide. Read More

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February 2019

Mixed-Matrix Membranes Formed from Multi-Dimensional Metal-Organic Frameworks for Enhanced Gas Transport and Plasticization Resistance.

ChemSusChem 2019 Jun 29;12(11):2355-2360. Epub 2019 Apr 29.

Department of Chemical Engineering, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts, 02139, USA.

Mixed-matrix membranes (MMMs) formed by incorporating metal-organic frameworks (MOFs) into polymers have a general limitation in that the MOFs are typically formed into rather simple dimensionalities (such as 1D, 2D, or 3D). Each design approach has intrinsic-albeit independent-benefits, such as network percolation (1D), access to high-aspect ratios (2D), and ease of processability (3D). However, a design strategy is needed to combine multiple dimensionalities and, thereby, access the full range of transport and compositing benefits of these high-performance materials. Read More

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Interfacial Engineering in Metal-Organic Framework-Based Mixed Matrix Membranes Using Covalently Grafted Polyimide Brushes.

J Am Chem Soc 2018 12 29;140(49):17203-17210. Epub 2018 Nov 29.

School of Physical Science and Technology , ShanghaiTech University , Shanghai 201210 , China.

Good interfacial compatibility is the key to realize the full potential of metal-organic framework-based mix matrix membranes for gas separation. Here we report a new approach that uses polyimide brushes covalently grafted on the MOF surface to engineer the MOF-polymer interface. Benefiting from the strong brush-brush interaction, polyimide grafted MOF particles can form a stand-alone membrane at 88 wt % MOF loading without the addition of polymeric matrix. Read More

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December 2018

Chemical Crosslinking of 6FDA-ODA and 6FDA-ODA:DABA for Improved CO₂/CH₄ Separation.

Membranes (Basel) 2018 Aug 20;8(3). Epub 2018 Aug 20.

Department of Inorganic Technology, University of Chemistry and Technology Prague, Technická 5, 166 28 Prague 6, Czech Republic.

Chemical grafting or crosslinking of polyimide chains are known to be feasible approaches to increase polymer gas-pair selectivity and specific gas permeance. Different co-polyimides; 6FDA-ODA and 6FDA-ODA:DABA were synthesized using a two-step condensation method. Six different cross-linkers were used: (i) -xylylene diamine; (ii) -ethylamine; and (iii) -butylamine, by reacting with 6FDA-ODA's imide groups in a solid state crosslinking; while (iv) ethylene glycol monosalicylate (EGmSal); (v) ethylene glycol anhydrous (EGAn); and (vi) thermally labile iron (III) acetylacetonate (FeAc), by reacting with DABA carboxyl groups in 6FDA-ODA:DABA. Read More

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Enhanced Chemical Separation by Freestanding CNT-Polyamide/Imide Nanofilm Synthesized at the Vapor-Liquid Interface.

ACS Appl Mater Interfaces 2018 Jun 4;10(23):19305-19310. Epub 2018 Jun 4.

Nanoscience for Energy Technology and Sustainability, Department of Mechanical and Process Engineering , Eidgenössische Technische Hochschule (ETH) Zurich , Tannenstrasse 3 , Zurich CH-8092 , Switzerland.

In chemical separation, thin membranes exhibit high selectivity, but often require a support at the expense of permeance. Here, we report a pinhole-free polymeric layer synthesized within freestanding carbon nanotube buckypaper through vapor-liquid interfacial polymerization (VLIP). The VLIP process results in thin, smooth and uniform polyamide and imide films. Read More

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Tuning the Gas Selectivity of Tröger's Base Polyimide Membranes by Using Carboxylic Acid and Tertiary Base Interactions.

ChemSusChem 2018 Aug 10;11(16):2744-2751. Epub 2018 Jul 10.

Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, 606-8501, Kyoto, Japan.

Polyimide-based materials provide attractive chemistries for the development of gas-separation membranes. Modification of inter- and intra-chain interactions is a route to improve the separation performance. In this work, copolyimides with Tröger's base (TB) monomers are designed and synthesized. Read More

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Pentiptycene-Based Polyurethane with Enhanced Mechanical Properties and CO-Plasticization Resistance for Thin Film Gas Separation Membranes.

ACS Appl Mater Interfaces 2018 May 11;10(20):17366-17374. Epub 2018 May 11.

Institute for Integrated Cell-Material Sciences (iCeMS) , Kyoto University , 606-8501 Kyoto , Japan.

The development of thin film composite (TFC) membranes offers an opportunity to achieve the permeability/selectivity requirements for optimum CO separation performance. However, the durability and performance of thin film gas separation membranes are mostly challenged by weak mechanical properties and high CO plasticization. Here, we designed new polyurethane (PU) structures with bulky aromatic chain extenders that afford preferred mechanical properties for ultra-thin-film formation. Read More

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Modeling the effects of lipid contamination in poly(styrene-isobutylene-styrene) (SIBS).

J Mech Behav Biomed Mater 2018 04 31;80:97-103. Epub 2018 Jan 31.

Department of Mechanical and Aerospace Engineering, North Carolina State University, Raleigh, NC, USA. Electronic address:

Lipid uptake and subsequent degradation was characterized as a function of molecular weight and styrene content in four different formulations of poly(styrene-block-Isobutylene-block-styrene) (SIBS). Mechanical testing in uniaxial tension at varying lipid concentrations showed a consistent decrease in tensile strength for all specimens due to lipid contamination. Higher styrene content was associated with an improved resistance to lipid intrusion. Read More

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