文献类型：期刊文献

英文题名：Mainchain Alternating Azopolymers with Fast Photo-Induced Reversible Transition Behavior

作者：Shen, Dingfeng[1];Yao, Yuan[1];Zhuang, Qixin[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Frontiers Sci Ctr Materiobiol & Dynam Chem, Sch Mat Sci & Engn, Shanghai Key Lab Adv Polymer Mat,Minist Educ,Key, Shanghai 200237, Peoples R China

年份：2021

卷号：54

期号：21

起止页码：10040

外文期刊名：MACROMOLECULES

收录：;EI(收录号：20214511136350);WOS:【SCI-EXPANDED(收录号:WOS:000718193500025)】；

基金：This work was financially supported by the National Natural Science Foundation of China (52073092, 52073094, and 51873061). Support by Shanghai Scientific and Technological Innovation Projects (19JC1411700, 18JC1410802, and 20ZR1415600) are also appreciated.

语种：英文

外文关键词：Isomerization - Ethylene glycol - Irradiation - Isomers - Piles - Glass transition

摘要：The trans-to-cis rate and ratio are key factors to azopolymers for many valuable photoresponsive applications. In this work, we designed and synthesized a series of mainchain azopolymers (P(EG(x)-alt-Azo)(n)) composed of alternatingly connected rigid azobenzene (Azo) units and flexible oligo ethylene glycol (EG(x)) units to accomplish a fast photo-induced reversible transition. Herein, the flexible EG(x) units submerge the individual Azo units to adapt to the isomerization of the Azo units. The rigid Azo units can pile up through interchain pi-pi stacking and isomerize adequately upon UV irradiation to accomplish swift photo-induced reversible transitions. Therefore, P(EG(6)-alt-Azo)(19) features very fast and effective trans to cis isomerization and exhibits distinct a photo-switchable glass-transition temperature (T-g) and rapid solid-to-liquid transition, which is promising for applications such as healable coatings, switchable adhesives, and athermal nanopatterning. This study gives an unusual insight into designing smart polymer materials with certain topology structures.