Gradual phase transition of poly(N-isopropylacrylamide-co-acrylic acid) gel induced by electric current |
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Authors: | Byung Cheol Shin Sung Soo Kim Jae Kyung Ko Jonggeon Jegal Byung Min Lee |
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Affiliation: | Advanced Materials Division, Korea Research Institute of Chemical Technology, P.O. Box 107, Yusong, Taejon 305-600, South Korea |
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Abstract: | The copolymer gels showing gradual phase transition induced by temperature were synthesized by redox random copolymerization of N-isopropylacrylamide (NIPAAm) and acrylic acid (AAc) monomer under a constant electric current. The behavior of gradual phase transition induced by temperature was examined by measuring the thermal properties, pKa values and swelling ratio. The experimental results indicate that temperature-induced gradual phase transitions of poly(NIPAAm-co-AAc) gel are mainly driven by transport before polymerization and protonation/ionization of the AAc, caused by the electric current. |
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Keywords: | Gradual phase transition Temperature-sensitive hydrogel Electric current Copolymer |
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