Abstract
Recently, high polymer hydrogel is applied to various fields, and is put in practical use. Gel causes volume change in reversible by changing surrounding environment (pH, an electric field, solvent composition, temperature) etc. Because its hardness is comparatively high, it pays attention to PVA gel as an actuator material. But, because reactivity was poor, PVA made it have reactivity by mixing copolymeric PVA. Degree of swelling increased as a result. It can be said that it is excellent as an actuator material from this result about the copolymeric PVA.
