A fastener of a shape memory polymer is formed by secondary shaping of a portion having a fastening function. When the preform before the secondary shaping of the fastening portion is primarily shaped into a form having no fastening function, the fastener loses the fastening performance and can be easily decomposed by heating the fastener above its glass transition point. The secondary shaping is effected by cold plastic shaping, or hot forming/cold fixing. The shape memory polymer is essential to have a large shape recoverability and a glass transition point adjustable in a region much higher than room temperature, and a polyurethane shape memory polymer is selected.
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