SHAPE MEMORY POLYMER PLASTIC-FORMING METHOD

摘要

In a fastener composed of a shape memory polymer, a portion displaying a fastening function is molded by secondary shaping. An original configuration of the fastener before the shape memory polymer is secondarily shaped is primarily shaped in such a way that the fastener does not have a fastening function. By heating the fastener above the glass transition temperature, the fastener loses a fastening force and can be easily decomposed. As the secondary shaping, cold plastic processing or a hot molding/cold fixing method is used. It is essential to use the shape memory polymer which has a high configuration recovery ratio and whose glass transition temperature can be adjusted in a region sufficiently higher than a room temperature. Thus a polyurethane shape memory polymer is selected.