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Report No.
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Ultraslow thermoresponse in hydrogels synthesized with radiation technique

Hiroki, Akihiro; Maekawa, Yasunari; Katakai, Ryoichi*; Yamashita, Takashi*; Muroya, Yusa*; Katsumura, Yosuke*; Yoshida, Masaru

Hydrogels, which were synthesized by radiation-induced polymerization and cross-linked reactions of acryloyl-L-proline methyl ester at 0$$^{circ}$$C in aqueous alcohol solutions, exhibit ultraslow volume change in response to variations in external temperature. The shrinking speed of the hydrogels prepared in aqueous alcohol is 1000 times slower than that of the hydrogel prepared in pure water; e.g., the hydrogel prepared in aqueous 1-propanol at 0$$^{circ}$$C shrank in 6 months. It is revealed that the ultraslow thermo-response consists of quick-shrinking and slow-shrinking periods; the ratio between the duration of the two periods depends on the alcohol molecules in the solution. The generation of hydroxyl group at the side chain of the polymer by the coupling reaction between $$alpha$$-hydroxyalkyl radicals of alcohols and $$alpha$$-radical of proline moiety was confirmed by GC/MS analysis of the radiation products. The hydrogen bonding domain containing the hydroxyl groups is proposed to be responsible for the ultraslow response.

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Category:Polymer Science

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