FORMED SHAPE-MEMORY MATERIAL

摘要

PURPOSE:To obtain a formed shape-memory material taking advantage of abrupt change of physical properties at the glass transition temperature or thereabout. CONSTITUTION:The formed shape-memory material contains a urethane elastomer having a glass transition temperature set to a temperature near the working temperature and synthesized from an isocyanate compound, a polyol compound and a chain extender. The material is formed to a desired shape at a temperature above the glass transition temperature of the urethane elastomer, cooled to a temperature below the glass transition temperature while keeping the desired shape to memorize the shape and heated in use at a temperature above the glass transition temperature to restore the memorized shape.