The aqueous solution of copolymers of N-(2-hydroxypropyl)methacrylamide (HPMA) and alkyl methacrylate (RMA, alkyl : methyl or butyl) with molar ratio of RMA more than 0.08 was found to exhibit the LCST though no phase transition occurred for the case of the homopolymer of HPMA.
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Sugiyama et al. (1997) studied this question.
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