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Polyolefin Thermoplastics for Multiple Shape and Reversible Shape Memory

ACS Applied Materials & Interfaces ( IF 8.456 ) Pub Date : 2017-01-30 , DOI: 10.1021/acsami.6b14728 

Yuan Gao, Weifeng Liu, Shiping Zhu

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.

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