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EFFECTS OF GELATION RETARDATION ON THERMAL RESPONSE BEHAVIOR OF PNIAPM GELS:A METHOD TO IMPROVE THEIR DESWELLING KINETICS

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Chinese Journal of Polymer Science 2007年第6期25卷 635-640页

作者： Qun-feng Liu Si-dong Li Ping Zhang Yan-xun Lan Man-geng Lu College of Science Guangdong Ocean University Zhanjiang 524088 China Guangzhou Institute of Chemistry Chinese Academy of Sciences P.O. Box 1122 Guangzhou 510650 China

P（N-isopropylacrylamide）（PNIPAM） prepared by reversible addition fragmentation chain transfer （RAFT） polymerization exhibited gelation retardation. The intermediate before gelation was characterized and indicated the presence of branched or hyperbranched chains. The swelling behavior was investigated, and the gel by RAFT polymerization （RAFT gel） showed accelerated shrinking kinetics and higher swelling ratio comparing with conventional gels （CG）. The study was extended to gels prepared by using 2-hydroxy- 1-ethanethiol as chain transfer agent and by using low concentration solutions. The two systems also exhibited retardation effects and improved deswelling kinetics. The different swelling behaviors of these gels and CG could be attributed to the presence of dangling chains caused by gelation retardation.

关键词： Chain transfer Hyperbranched Graft hydrogels.

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DIFFERENT TYPES OF MICROFIBRILLATED CELLULOSE AS FILLER MATERIALS IN POLYSODIUM ACRYLATE SUPERABSORBENTS

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Chinese Journal of Polymer Science 2011年第4期29卷 407-413页

作者： Mikael Larsson Qi Zhou Anette Larssona Department of Chemical and Biological Engineering Chalmers University of Technology 41296 Gothenburg Sweden Wallenberg Wood Science Center Royal Institute of Technology SE-100 44 Stockholm Sweden School of Biotechnology Royal Institute of Technology SE-106 91 Stockholm Sweden

Three types of microfibrillated cellulose （MFC） with differences in structure and surface charge were used at low concentration as filler materials in polysodium acrylate superabsorbents （SAPs）. The swelling of the composite hydrogels.was determined in 0.9% NaCl solution as well as in deionized water. The shear modulus of the samples was determined through uniaxial compression analysis after synthesis and after swelling in 0.9% NaC1 solution. Furthermore, the ability to retain filler effects after washing was investigated. The results showed that all of the investigated MFCs had a strong reinforcing effect on the shear modulus after synthesis. The filler effect on swelling and on the associated shear modulus of swollen samples showed a more complicated dependence on structure and surface charge. Finally, it was found that the filler effects were reasonably retained after washing and subsequent drying. The results confirm that MFC holds great potential as a filler material in superabsorbent applications. Furthermore, the results provide some insight on how the structural properties and surface charge of MFC will affect gel properties depending on swelling conditions. This information should be useful in evaluating the use of different types of MFC in future applications.

关键词： SAP MFC Microfibrillated cellulose Polyacrylic acid hydrogels.

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