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Production of polyamic acid in supercritical carbon dioxide with N,N‐dimethylformamide

13-09-2013 | Masashi Haruki, Yumi Hasegawa, Naoya Fukui, Shin‐ichi Kihara, Shigeki Takishima, Journal of Applied Polymer Science, 2013

ABSTRACT To develop a microscale processing technique for aromatic polyimides (APIs) in supercritical carbon dioxide (scCO2), the relationships between the polymerization condition, the phase behavior during polymerization and the molecular weight of polyamic acid (PAA)—an intermediate in the ...


Composite films of N,O‐carboxymethyl chitosan and bamboo fiber

13-09-2013 | Xue Zheng, Hao Zhang, Ying She, Junwen Pu, Journal of Applied Polymer Science, 2013

ABSTRACT To obtain an antibacterial chitosan derivative, composite films of N,O‐Carboxymethyl Chitosan (N,O‐CMCS) and bamboo fiber were prepared. A water‐soluble chitosan derivative‐N,O‐CMCS was synthesized from chitosan with chloroacetic acid in alkaline solution. Composite films with 1–5 wt ...


Montmorillonite‐reinforced sulfonated poly(phthalazinone ether sulfone ketone) nanocomposite proton exchange membranes for direct methanol fuel cells

13-09-2013 | Zhengwen Hu, Gaohong He, Shuang Gu, Yuanfa Liu, Xuemei Wu, Journal of Applied Polymer Science, 2013

ABSTRACT To produce a composite membrane with high conductivity and low permeability, SPPESK with a degree of sulfonation of 101% was carefully selected for the preparation of montmorillonite (MMT)‐reinforced SPPESK using solution intercalation. The fundamental characteristics such as water ...


Extraction of protein from skim natural rubber latex using PEG as a surfactant via low speed centrifugation and continuous flow

13-09-2013 | Duangkamol Danwanichakul, Ornthana Rattanaphan, Jirarat Srisatjang, Panu Danwanichakul, Journal of Applied Polymer Science, 2013

ABSTRACT Protein extractions from skim natural rubber latex using 3 %w/v polyethylene glycol (PEG6000) via both low speed centrifugation and continuous flow were investigated. In centrifugal extraction, when the speed was 1000 rpm, the extractable protein (EP) content in serum increased with ...


Remarkably stable amphiphilic random copolymer assemblies: A structure‐property relationship study

11-09-2013 | Krishna Dan, Priya Rajdev, Jolly Deb, Siddhartha S. Jana, Suhrit Ghosh, Journal of Polymer Science Part A: Polymer Chemistry, 2013

ABSTRACT Synthesis of a library of amphiphilic random copolymers from a single reactive pre‐polymer and their self‐assembly is reported. Post‐polymerization modifications of the parent polymer containing pendant N‐hydroxy succinimide (NHS) ester groups with various oligooxyethylene (OE) amines ...


Study of factors affecting the results of natural water analyses by total reflection X‐ray fluorescence

10-09-2013 | G. V. Pashkova, A. G. Revenko, A. L. Finkelshtein, X-Ray Spectrometry, 2013

The study aims to choose the conditions for the direct analysis of different types of natural water samples by total reflection X‐Ray fluorescence spectrometry (TXRF). The effect of some factors on TXRF results was studied such as the surface density of dried water residue on the sample carrier, ...


A highly sensitive “test paper” for Hg2+ ions based on polyurethane membrane

10-09-2013 | Xianghong Li, Zhen Yang, Xinjian Cheng, Huijuan Zhang, Guiping Wu, Aiqing Zhang, Polymers for Advanced Technologies, 2013

Heavy metals have caused a lot of serious problems to human beings. A reusable, highly sensitive metal sensor based on polyurethane membrane, which can detect and remove Hg2+ ions, was prepared and tested in this work. A sensor with hydroxyl (−OH) group was grafted to polyurethane, and the heavy ...


Preparation and characterization of composite gels and films containing gelatin and hydroxypropyl methylcellulose phthalate

10-09-2013 | S. H. Bang, J. R. Son, S. Y. Lee, H. J. Park, Journal of Applied Polymer Science, 2013

ABSTRACT Composite gels and films were prepared by the blending of hydrated gelatin as a base material and hydroxypropyl methylcellulose phthalate (HPMCP) at various mass ratios. A composite technology was applied to obtain improved mechanical, physicochemical, and antimicrobial properties of ...


Spatial variability in sulphur isotope values of archaeological and modern cod (Gadus morhua)

09-09-2013 | Olaf Nehlich, James H. Barrett, Michael P. Richards, Rapid Communications in Mass Spectrometry, 2013

RATIONALE This study presents the first sulphur isotope data of modern and archaeological cod (Gadus morhua) bone collagen, undertaken to identify large‐scale spatial variability of significance as both baseline values for studies of human diet and a potential variable in isotope‐based studies ...


Foam‐like polymer/clay aerogels which incorporate air bubbles

08-09-2013 | Rocco P. Viggiano, Matthew D. Gawryla, David A. Schiraldi, Journal of Applied Polymer Science, 2013

ABSTRACT The structure/property relationships of polymer/clay aerogels interfused with uniformly distributed air bubbles were examined. Through the incorporation of a polyelectrolyte in a montmorillonite(MMT) clay solution, the viscosity was systematically changed by the addition of ions with ...


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