Shape memory rubbery elastomer

Abstract

Abstract PURPOSE:To obtain a shape memory rubbery elastomer comprising a vulcanizate of a rubbery polymer or polymer blend having a specified glass transition point, a specified melting point, and a specified crystallinity. CONSTITUTION:A shape memory rubbery elastomer comprising a vulcanizate of a rubbery polymer or polymer blend having a glass transition temperature <=-10 deg.C, a melting point of 35-90 deg.C and a crystallinity of 10-50% Said vulcanizate can be molded into a predetermined shape in the same way as in the vulcanization and molding of an usual rubber. Its deformation can be fixed by crystallization at a temperature >=the glass transition point. It shows elasticity at normal temperature and can be restored to the initial predetermined shape by heating again to a temperature >= the melting point. It is preferable that at least 50wt% of a polymer material for the polymer or its blend is polychloroprene rubber of a crystallinity >=20%. When attaining an object, e.g., for sealing or connection by a technique comprising restoring to the initial shape by heat generation by application of an electricity, impartation of electroconductivity can be effected by the addition of or doping with, for exam ple, an electroconductive additive such as graphite or carbon.

Inventors

• 👤 Kazuyoshi Mitsunari
• 👤 光成　和敬

Bibliographic Details