Abstract
Polymer gels with various degrees of opacity were first made by copolymerization of N-isopropylacrylamide/N,N‘-methylene(bis)acrylamide solutions at polymerization temperatures of 22−29 °C. The opaque gels underwent a gradual opacity change from transparent to a whitish state with increase in temperature, whereas transparent gels prepared at polymerization temperatures below 21 °C underwent a discontinuous opacity change from transparent to white at 32 °C. These results could be successfully explained by taking into account a microaggregate structure formed by hydrophobic side chains of the gel polymers, in addition to conventional three-dimensional network structure. In particular, the results of temperature-dependent opacity changes of the gels were consistently accounted for by increasing/decreasing of the microaggregate structure upon change in temperature. From the other point of view, such a novel structural changes could be regarded as a sort of microphase separation formed between the hydrophobic ...
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