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Title of Journal: Colloid Polym Sci

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Abbravation: Colloid and Polymer Science

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Springer-Verlag

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DOI

10.1016/0022-3913(64)90193-3

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1435-1536

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Preparation and characterization of pH and temper

Authors: Jinghong Ma Yajing Xu Qingsong Zhang Liusheng Zha Borun Liang
Publish Date: 2006/11/09
Volume: 285, Issue: 4, Pages: 479-484
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Abstract

A new kind of pH and temperatureresponsive semiinterpenetrating polymer network hydrogel based on linear carboxymethylchitosan CMCS and poly Nisopropylacrylamide PNIPA crosslinked by inorganic clay was prepared The pHand temperatureresponsive behaviors the deswelling kinetics and the mechanical properties of the hydrogel were investigated The hydrogels exhibited a volume phase transition temperature around 33 °C with no significant deviation from the conventional PNIPA hydrogels The results of the influence of pH value on the swelling behaviors showed that the minimum swelling ratios of the hydrogels appeared near the isoelectric point IEP of CMCS and when pH deviated from the IEP the hydrogels behaved as polycations or polyanions The novel hydrogels had much higher response rate than the conventional CMCS/PNIPA hydrogels Moreover the semiIPN hydrogels crosslinked by clay could be elongated to more than 800 and the elongation could be recovered almost completely and instantaneously

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