title: Polyolefin Thermoplastics for Multiple Shape and Reversible Shape Memory.
abstract: 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.
authors.affiliation: Department of Chemical Engineering, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Gao
authors.affiliation: 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.
authors.forename: Weifeng
authors.initials: W
authors.lastname: Liu
authors.affiliation: Department of Chemical Engineering, McMaster University , 1280 Main Street West, Hamilton, Ontario L8S 4L7, Canada.
authors.forename: Shiping
authors.identifier: http://orcid.org/0000-0001-8551-0859
authors.initials: S
authors.lastname: Zhu
keywords: POE; diblock copolymers; one-way shape memory polymers; polyolefin elastomers; reversible shape memory polymers; thermoplastics