A novel type of shape memory polymer blend and the shape memory mechanism
A novel type of shape memory polymer blend and the shape memory mechanism
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DOI：
10.1016/j.polymer.2009.01.011
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发表时间：
2009-03
期刊：
影响因子：
4.6
通讯作者：
Heng Zhang;Haitao Wang;W. Zhong;Q. Du
中科院分区：
文献类型：
--
作者：
Heng Zhang;Haitao Wang;W. Zhong;Q. Du
介绍了一种具有形状记忆性能的新型苯乙烯-丁二烯-苯乙烯三嵌段共聚物（SBS）和聚己内酯（PCL）共混物。与已有的形状记忆聚合物（SMPs）相比，这种新型弹性体和开关聚合物的共混物不仅简化了制造工艺，而且为研究其机理和优化形状记忆性能提供了一种可控的方法。通过差示扫描量热法（DSC）、AFM显微镜观察和拉伸试验对共混物的微观结构进行了表征。DSC结果显示SBS和PCL之间的不混相。AFM图像和应力应变图进一步证实了共混物的两相形态。结果表明，SBS连续相和PCL连续相分别有利于材料的形状恢复和形状固定。在此基础上，详细分析了该SMP体系的形状记忆机理，并以此为基础设计了具有良好恢复和固定性能的优化SMP体系。
A novel styrene–butadiene–styrene tri-block copolymer (SBS) and poly(ɛ-caprolactone) (PCL) blend were introduced for its shape memory properties. Compared to the reported shape memory polymers (SMPs), this novel elastomer and switch polymer blend not only simplified the fabrication process but also offer a controllable approach for the study of mechanisms and the optimization of shape memory performances. Microstructures of this blend were characterized by differential scanning calorimetry (DSC), AFM microscope observation and tensile test. DSC results demonstrated the immiscibility between SBS and PCL. AFM images and stress–strain plot further confirmed the two-phase morphology within the blend. It was found that the SBS and PCL continuous phases contributed to the shape recovery and shape fixing performances, respectively. A detailed shape memory mechanism for this type of SMP system was then concluded and an optimized SMP system with both good recovery and fixing performances was designed from this mechanism.