Synthesis and characterization of pH/temperature-sensitive hydrogels based on chitosan derivative

SummaryA series of pH/temperature-sensitive hydrogels composed of maleilated chitosan (MC) and N-isopropylacrylamide (NIPAAm) were prepared and characterized with respect to their swelling behaviors, change of lower critical solution temperature (LCST). These hydrogels showed broad pH-sensitivities...

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Bibliographic Details
Published in:Polymer bulletin (Berlin, Germany) Germany), 2002, Vol.47 (5), p.451-456
Main Authors: MOON SIK SHIN, HYUNG SEOK KANG, TAE GWAN PARK, YANG, Ji-Won
Format: Article
Language:English
Subjects:
Applied sciences
Chitosan
Exact sciences and technology
Hydrogels
Isopropylacrylamide
Moisture content
Natural polymers
Phase transitions
Physicochemistry of polymers
Starch and polysaccharides
Temperature dependence
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Summary:SummaryA series of pH/temperature-sensitive hydrogels composed of maleilated chitosan (MC) and N-isopropylacrylamide (NIPAAm) were prepared and characterized with respect to their swelling behaviors, change of lower critical solution temperature (LCST). These hydrogels showed broad pH-sensitivities below 32 °C, but above that temperature exhibited sharp pH-dependent phase transition behaviors which depended on the content of MC in the hydrogels. The change of ratio of NIPAAm to MC in weight did not affect LCST significantly, while it affected equilibrium water content (EWC) at high pH region. The hydrogels also exhibited a typical of reversibility depending on temperature and pH.
ISSN:0170-0839
1436-2449
DOI:10.1007/s002890200008