Journal
POLYMER
Volume 43, Issue 18, Pages 4997-5003Publisher
ELSEVIER SCI LTD
DOI: 10.1016/S0032-3861(02)00350-6
Keywords
beta-cyclodextrin; N-isopropylacrylamide; pH- and temperature-sensitive hydrogel
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A reactive P-Cyclodextrin (P-CD) based monomer carrying vinyl carboxylic acid functional groups was synthesized via reaction of P-CD with maleic anhydride (MAH) in N,N-dimethylformamide (DMF) at 80degreesC. By copolymerization of the monomer with N-isopropylacrylamide (NIPA), a novel hydrogel, poly(NIPA-co-MAH-P-CD) with pH and temperature sensitivities plus molecular inclusion function, was obtained using free radical polymerization in aqueous solution. The hydrogel's composition was determined by element analysis and infrared spectroscopy. Equilibrium swelling ratio (ESR) of hydrogels was tested under different environment of pH, temperature and ionic strength. The results indicated that ESR of hydrogels presents marked variations following the change of experimental conditions used. (C) 2002 Elsevier Science Ltd. All rights reserved.
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