Photoinduced Reversible Worm-to-Vesicle Transformation of Azo-Containing Block Copolymer Assemblies Prepared by Polymerization-Induced Self-Assembly
Photoinduced Reversible Worm-to-Vesicle Transformation of Azo-Containing Block Copolymer Assemblies Prepared by Polymerization-Induced Self-Assembly
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DOI：
10.1021/acs.macromol.8b00340
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发表时间：
2018-04
期刊：
影响因子：
5.5
通讯作者：
Qiquan Ye;Meng Huo;Min Zeng;Leichun Liu;Liao Peng;Xiaosong Wang;Jinying Yuan
中科院分区：
文献类型：
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作者：
Qiquan Ye;Meng Huo;Min Zeng;Leichun Liu;Liao Peng;Xiaosong Wang;Jinying Yuan
采用可逆加成-断裂链转移聚合法，在高固含量条件下制备了一系列聚甲基丙烯酸N，N-二甲氨基乙酯-b-聚[甲基丙烯酸苄酯-co-（4-苯基偶氮苯甲基丙烯酸酯）] [PDMA-b-P（BzMA-co-AzoMA）]偶氮共聚物组装体。根据P（BzMA-co-AzoMA）的链长，容易制备球体、蠕虫和囊泡。这些偶氮蠕虫状胶束进行可逆的蠕虫囊泡转换后，交替的紫外/维斯光照射。通过对形态演化的研究，观察到了一系列的中间体，包括聚结的蠕虫以及“章鱼”状和“水母”状结构。形态的转变是合理的P（BzMA-co-AzoMA）块的体积变化所造成的反式-顺式异构化的偶氮苯基团。这是首次证明光刺激的可逆蠕虫到囊泡的转变，并将有利于理解的M。
A series of azo-containing copolymeric assemblies based on poly(N,N-dimethylaminoethyl methacrylate)-b-poly[(benzyl methacrylate)-co-(4-phenylazophenyl methacrylate)] [PDMA-b-P(BzMA-co-AzoMA)] were prepared by reversible addition–fragmentation chain transfer polymerization-induced self-assembly at high solid contents. Depending on the chain length of P(BzMA-co-AzoMA), spheres, worms, and vesicles were readily prepared. These azo-containing wormlike micelles underwent reversible worm-to-vesicle transformation upon alternative UV/vis light irradiation. By investigating the morphology evolution, a series of intermediates were observed, including coalesced worms as well as “octopus”-like and “jellyfish”-like structures. The morphology transformation was rationalized by the volume change of the P(BzMA-co-AzoMA) block caused by the trans–cis isomerization of the azobenzene groups. It is the first demonstration of light-stimulated reversible worm-to-vesicle transition and would benefit for the understanding of m...