形状记忆聚合物
形状记忆合金
差示扫描量热法
材料科学
复合材料
聚氨酯
热塑性聚氨酯
应变率
热塑性塑料
拉伤
玻璃化转变
造型(装饰)
聚合物
热力学
弹性体
物理
医学
内科学
作者
Mattia Coccia,Emanuele Farotti,Gianluca Chiappini,T. Bellezze,M. Sasso
标识
DOI:10.1177/1045389x221121917
摘要
Shape memory polymers (SMPs) represent a materials class capable of recovering their initial shape, when submitted to deformations, through an external stimulus. This paper focuses on a Shape Memory Thermoplastic Polyurethane (SMPU), characterized by a one-way shape memory effect (SME) activated by temperature. The material was characterized by Differential Scanning Calorimetry (DSC) to find transition temperature; then, it was manufactured by an injection molding machine to perform a campaign of characterization tests. Thermomechanical tests were conducted varying the prescribed strain (up to 25%, 50%, and 80%), imposed at both different strain rates ([Formula: see text], [Formula: see text], and [Formula: see text] s −1 ), and temperatures (50°C, 60°C, and 70°C); the results were investigated in terms of shape fixity and shape recovery ratios. An excellent memory capability was observed for all the tested conditions; otherwise, the shape recoverability is strongly influenced by all investigated parameters, especially by the strain rate, resulted to be the most effective one. In fact, the shape recovery ratio can increase as much as 20%, when the strain rate is increased from [Formula: see text] to [Formula: see text] s −1 . An opposite effect was observed with the variation of prescribed strain and temperature, the increase of which reduces the ability of the material to return to its original shape.
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