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Thermoreversible hydrogels. VII. Synthesis and swelling behavior of poly(N-isopropylacrylamide-co-3-methyl-1-vinylimidazolium iodide) hydrogels

✍ Scribed by Wen-Fu Lee; Cheng-Hawn Hsu

Publisher
John Wiley and Sons
Year
1999
Tongue
English
Weight
265 KB
Volume
74
Category
Article
ISSN
0021-8995

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✦ Synopsis

A series of N-isopropylacrylamide/3-methyl-1-vinylimidazolium iodide (NIPAAm/MVI) copolymer gels were prepared from the various molar ratios of NIPAAm, cationic monomer MVI, and N,NЈ-methylene bisacrylamide (NMBA) in this study. The influence of the amount of MVI in the copolymer gels on the swelling behaviors was investigated in various aqueous saline solutions. Results showed that the swelling ratios (SRs) of copolymer gels were significantly greater than those of NIPAAm homopolymer gels, and the higher the MVI content, the higher the volume phase transition temperature. The SRs for the NIPAAm/MVI copolymer gels decreased with an increase of the salt concentration. In various saline solutions, results showed that the effect of divalent ions on the SR was greater than that of monovalent ions for these hydrogels.

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