EAA基热致型热塑性形状记忆高分子弹性体的制备与性能研究

Preparation and Properties of Heat-Triggered Thermoplastic Shape Memory High Polymer Elastomers Based on EAA

采用乙烯-丙烯酸共聚物(EAA)热塑性弹性体制备了热致型形状记忆高分子材料,并对其力学性能、微观取向结构、结晶行为和不同变形模式下的形状记忆效应进行了研究,还对变形温度与回复温度对其形状记忆效应的影响进行了探讨。结果表明,EAA样品拉伸表面存在明显取向结构,为其形状回复提供了驱动力;根据EAA样品的熔融、结晶和粘弹行为可确定其形状记忆变形温度和回复温度范围;在拉伸、旋转和卷曲模式下,EAA样品均表现出良好形状记忆效应;当变形温度接近EAA熔点且为95℃时,EAA样品同时具备优异的形状固定率(98.7%)和良好的形状回复率(91.5%);升高回复温度可提高EAA样品形状回复速率。

A heat-triggered shape memory polymer was prepared by using ethylene-acrylic acid copolymer(EAA)thermoplastic elastomer,the mechanical properties,orientation microstructure,crystallization behavior and shape memory effct under different deformation modes were researched,the influences of deformation temperature and recovery temperature on shape memory effect was also studied.The results showed that the surface of the stretched EAA sample had obvious orientation texture,which would provide the driving force for the shape recovery.The ranges of the deformation temperature and recovery temperature of shape memory could be determined by the melting,crystallization and viscoelasticity behaviors of EAA samples.The EAA specimens exhibited the excellent shape memory effect under the stretching,spiraling and curling deformation modes.EAA specimen could obtain excellent shape fixing ratio(98.7%)and good shape recovery ratio(91.5%)when the deformation temperature was close to the melting temperature of EAA and was 95℃.The shape recovery speed could be significantly promoted by increasing the recovery temperature.