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Thermosensitive copolymers with pyridyl and/or pyridinium groups were prepared by copolymerization of 4-vinylpyridine (4VP) and N-isopropylacrylamide (NIPAAm) followed by the reaction of 4VP–NIPAAm copolymers with benzyl chloride.The copolymer 4VP–NIPAAm was soluble in dilute HCl below 32°C, but the quaternized 4VP–NIPAAm copolymer was soluble even in aqueous solutions of pH 6.5 below 28°C. The thermosensitivity...
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