文献类型：期刊文献

英文题名：Light-Driven Shape-Memory Porous Films with Precisely Controlled Dimensions

作者：Wang, Wei[1,2];Shen, Dingfeng[1];Li, Xiao[2];Yao, Yuan[1];Lin, Jiaping[1];Wang, Aurelia[2];Yu, Jiwoo[2];Wang, Zhong Lin[2];Hong, Suck Won[3];Lin, Zhiqun[2];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat, Minist Educ,Lab Ultrafine Mat, Shanghai 200237, Peoples R China;[2]Georgia Inst Technol, Sch Mat Sci & Engn, Atlanta, GA 30332 USA;[3]Pusan Natl Univ, Dept Opt & Mechatron Engn, Dept Cognomech Engn, Busan 46241, South Korea

年份：2018

卷号：57

期号：8

起止页码：2139

外文期刊名：ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

收录：;EI(收录号：20180504694242);WOS:【SCI-EXPANDED(收录号:WOS:000424879400019)】；

基金：This work is supported by National Natural Science Foundation of China (grant nos. 51622301 and 51573046) and the National Science Foundation (CMMI 1727313). Support from Projects of Shanghai Municipality (14SG29, 222201717001 and 17JC400700) and National Research Foundation of Korea (BK21 Plus program) are also appreciated.

语种：英文

外文关键词：azobenzene; block copolymers; light manipulation; shape memory; thin films

摘要：Shape-memory polymers (SMPs) are an intriguing class of smart materials possessing reversible shape change and recovery capabilities. Effective routes to shape-memory porous films (SMPFs) are few and limited in scope owing to the difficulty in manipulating the shape change of pores by conventional methods. Herein we report an unconventional strategy for crafting light-driven SMPFs by judiciously constructing highly ordered porous films via a facile "breath figure" approach, followed by sequential vapor crosslinking and nondestructive directional light manipulation. Micropores can thus be transformed into other shapes including rectangle, rhombus and size-reduced micropores at room temperature. The transformed micropores can be reverted to their original shapes by either thermal annealing or UV irradiation. As such, this strategy expands the rich diversity of SMPs accessible.