Department of Chemical Engineering, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada.
School of Chemistry and Chemical Engineering, South China University of Technology , Guangzhou, Guangdong 510640, China.
ACS Appl Mater Interfaces. 2017 Feb 8;9(5):4882-4889. doi: 10.1021/acsami.6b14728. Epub 2017 Jan 30.
This work reports the first pure hydrocarbon thermoplastic polyolefin material with reversible shape memory effect under stress-free or very small external loading condition. A thermoplastic ethylene/1-octene diblock copolymer with designed chain microstructure was synthesized. The polyolefin material performed not only the conventional one-way multishape memory effects, but also a two-way reversible shape memory effect (RSME). The elongation and contraction induced by oriented crystallization with heating was confirmed as the mechanism of RSME without chemical cross-linking. This work demonstrated that the thermoplastic reversible shape memory could be achieved through careful design of chain microstructure, based on sole hydrocarbon materials such as ethylene-1-octene copolymer.
本文报道了首例在外力或很小的外部加载条件下具有应力松弛型形状记忆效应的纯碳氢热塑性聚烯烃材料。设计了具有特定链结构的热塑性乙烯/1-辛烯嵌段共聚物，并对其进行了合成。该聚烯烃材料不仅表现出常规的单向多重形状记忆效应，而且表现出双向可逆形状记忆效应（RSME）。通过加热诱导的取向结晶产生的伸长和收缩被证实是 RSME 的机制，而无需化学交联。这项工作表明，基于乙烯-1-辛烯共聚物等纯碳氢材料，通过仔细设计链结构，可以实现热塑性可逆形状记忆。
