文献类型：期刊文献

英文题名：Dual-Control Mechanism of Water and Temperature in Automatically Programmable Shape Memory Polymers

作者：Zhang, Jun[1];Xu, Wanli[1];Heng, Kejie[1];Chu, Mingyu[1];Qian, Binjie[1];Tang, Junkun[1];Liu, Zuozhen[2];Huang, Farong[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Specially Funct Polymer Mat & Related Tec, Shanghai 200237, Peoples R China;[2]East China Univ Sci & Technol, Huachang Polymers Co Ltd, Shanghai 200241, Peoples R China

年份：2022

卷号：307

期号：10

外文期刊名：MACROMOLECULAR MATERIALS AND ENGINEERING

收录：;EI(收录号：20223112464850);WOS:【SCI-EXPANDED(收录号:WOS:000831343900001)】；

基金：This work was supported by "the National Natural Science Foundation of China" (grant no. 21805088), and "the Fundamental Research Funds for the Central Universities" (grant no. JKD01211701, grant no. JKD01211611, grant no. 222201814003).

语种：英文

外文关键词：auto-programming memory polymers; dual control of water and temperature; poly(1; 2; 3-triazolium); shape memory polymers

摘要：Auto-programmable shape memory polymers (AP-SMPs) can deform automatically without external manipulation, exhibiting either a free-standing temporary shape or a permanent shape. The unique shape memory behaviors derive mainly from control by two factors, water and temperature. However, the control mechanism is unknown. This study analyzes and demonstrates the dual-control mechanism of water and temperature in the three shape-changing processes of AP-SMPs. First, the AP-SMP is immersed in warm water (50 degrees C). Asymmetric swelling of bilayer films provides the driving force for the shape auto-programming of the AP-SMP. The solvent effect of water reduces the glass transition temperature (T-g) of the AP-SMP, which becomes lower than the medium temperature in warm water. AP-SMP can be programmed automatically. Then, the AP-SMP is removed from water and placed in air at room temperature. The T-g value of the matrix film increases notably in air and exceeds the medium temperature. The temporary shape of the AP-SMP can thus be fixed. Finally, the AP-SMP can quickly return to its permanent shape when the medium temperature exceeds the matrix film T-g in air. The dual control shape memory mechanism provides insights into the design and development of AP-SMPs.