title: New Strategy to Access Dual-Stimuli-Responsive Triple-Shape-Memory Effect in a Non-overlapping Pattern.
abstract: Multistimuli-responsive shape-memory polymers are highly desirable in various applications, and numerous modes have been developed in recent years. However, most of them need to reprogram before they are ready to respond to another stimulus while one is triggered. Here, a new strategy is developed to achieve dual-stimuli-responsive triple-shape memory with non-overlapping effect in one programming cycle. Here, a series of poly(l-lactide)-poly(tetramethylene oxide) glycol copolymers (PLA-PTMEG-A) is prepared by selected dangling photoresponsive anthracene moieties on the crystalline PTMEG backbone. The architectures of the copolymers are well-controlled in order to keep a good balance between the crystallinity of the soft segment and the mobility of the anthracene moieties. Thus, PLA-PTMEG-A's can respond to heat and light with non-overlapping effect. The thermally-induced shape-memory effect (TSME) is realized by the crystallization-melting transition of PTMEG soft segments, while the light-induced shape-memory effect (LSME) is achieved by the reversible photodimerization of anthracene groups. In view of the non-overlapping effect of TSME and LSME in the copolymers, a triple-shape-memory effect triggered by dual-stimuli is realized in one programming and recovery cycle.
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Hui
authors.initials: H
authors.lastname: Xie
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Xiao-Ying
authors.initials: XY
authors.lastname: Deng
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Chuan-Ying
authors.initials: CY
authors.lastname: Cheng
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Ke-Ke
authors.initials: KK
authors.lastname: Yang
authors.affiliation: Center for Degradable and Flame-Retardant Polymeric Materials, National Engineering Laboratory of Eco-Friendly Polymeric Materials (Sichuan), State Key Laboratory of Polymer Materials Engineering, College of Chemistry, Sichuan University, Chengdu, 610064, China.
authors.forename: Yu-Zhong
authors.initials: YZ
authors.lastname: Wang
mesh_terms: D006018:Glycols / Q000138:chemical synthesis / Q000737:chemistry*; D015394:Molecular Structure; D011091:Polyesters / Q000138:chemical synthesis / Q000737:chemistry*; D013696:Temperature
chemical_list: D006018:Glycols; D011091:Polyesters; C047554:polytetramethylene glycol; C033616:poly(lactide)
keywords: anthracene; dual-stimuli-responsive; functionalization of polymers; shape memory; stimuli-sensitive polymers