リビングカチオン重合による脂肪族多環基をもつブロックコポリマーの合成および温度応答性フィルムの創製
2005 年 62 巻 2 号 p. 92-95
詳細
2005 年 62 巻 2 号 p. 92-95
Living cationic polymerization of a vinyl ether with a bicycloalkane group (TMVE) was achieved using the Et1.5AICI1.5-based initiating system in the presence of ethyl acetate at 30°C. The molecular weight distribution of the polymers was very narrow (Mw/Mn=1.03-1.08) throughout the polymerization. Diblock copolymers of TMVE with a stimuli-responsive segment were also synthesized to prepare a new class of smart films. The resulting films showed reversible thermosensitive behavior. For example, a film was obtained from a diblock copolymer containing a thermosensitive segment that becomes insoluble in water above 20°C. This film exhibited high affinity to water at 0°C, whereas it repelled water at 30°C. The transition temperature can readily be altered by using a diblock copolymer having a thermosensi-tive segment that has a different critical temperature for LCST-type phase separation in water.
