文献类型：期刊文献

英文题名：Light-Induced Reversible Hierarchical Self-Assembly of Amphiphilic Diblock Copolymers into Microscopic Vesicles with Tunable Optical and Nanocarrier Properties

作者：Sun, Yao[1];Gao, Fei[1];Yao, Yuan[1];Jin, Haibao[1];Li, Xinxin[1];Lin, Shaoliang[1]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Minist Educ, Key Lab Ultrafine Mat,Shanghai Key Lab Adv Polyme, Shanghai 200237, Peoples R China

年份：2021

卷号：10

期号：5

起止页码：525

外文期刊名：ACS MACRO LETTERS

收录：;EI(收录号：20211910314466);WOS:【SCI-EXPANDED(收录号:WOS:000654292600003)】；

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

语种：英文

外文关键词：Block copolymers - Self assembly - Light - Synthesis (chemical) - Assembly

摘要：In contrast to the conventional hierarchical self-assembly process, effective methods to enable reversible hierarchical self-assembly of block copolymers are comparatively few and limited in scope. Herein, we report, for the first time, a simple yet robust strategy for light-induced reversible hierarchical self-assembly of an amphiphilic diblock copolymer, poly(4-vinylpyridine)-block-poly[6-[4-(4-butyloxyphenylazo)phenoxy]hexyl methacrylate] (denoted P4VP-b-PAzoMA). The hierarchical structures are constructed via a two-step self-assembly process (first-level reverse micelles, second-level compound micelles, and rearrangement into micrometer-sized vesicles) driven by use of solvent. Intriguingly, because of reversible photoinduced trans-to-cis isomerization of azobenzene moieties in PAzoMA, the vesicles could disassemble into subunits upon UV light and then recover the nearly identical vesicular morphology upon visible light. Such a reversible hierarchical self-assembly process is accompanied by reversible fluorescence, encapsulation, and controlled release of dyes and can be used as a template for the synthesis of nanoparticles. Clearly, the ability to render the light-enabled reversible hierarchical self-assembly provides a unique platform for smart delivery vehicles and templates for nanomaterials.