Abstract
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.
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