Novel Wormlike Nanostructures Self-Assembled in a Well Defined Liquid Crystalline Diblock Copolymer with Azobenzene Moieties
Novel Wormlike Nanostructures Self-Assembled in a Well Defined Liquid Crystalline Diblock Copolymer with Azobenzene Moieties
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DOI：
10.1002/marc.200600901
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发表时间：
2007-04
影响因子：
4.6
通讯作者：
Haifeng Yu;A. Shishido;T. Iyoda;T. Ikeda
中科院分区：
文献类型：
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作者：
Haifeng Yu;A. Shishido;T. Iyoda;T. Ikeda
通过原子转移自由基聚合（ATRP）制备了一种具有偶氮苯结构的嵌段共聚物，并在其本体膜中自组装了蠕虫状纳米结构。为了比较，还制备了与共聚物中的偶氮苯重复单元几乎相同的均聚物。它们都具有明确的结构，并表现出近晶液晶相。退火后的共聚物膜，聚（甲基丙烯酸甲酯）形成了一个矩阵具有优异的光学性能，和偶氮苯部分在少数相自组装成蠕虫状介晶域的散装膜。这种嵌段共聚物薄膜通过消除可见光的散射而表现出稳定性和透明性，表明它们作为光响应功能材料的潜在应用。虽然蠕虫状的形态已经获得了胶束从嵌段共聚物的解决方案，据我们所知，这种蠕虫状的纳米结构从来没有被探索在散装薄膜。
Novel wormlike nanostructures were self-assembled in bulk films of a well defined diblock copolymer with azobenzene moieties, which was prepared by atom transfer radical polymerization (ATRP). For comparison, a homopolymer with almost the same repeat units of azobenzene as those in the copolymer was also prepared. They both had well defined structures and exhibited a smectic liquid crystalline phase. Upon annealing the copolymer films, poly (methyl methacrylate) formed a matrix with excellent optical properties, and the azobenzene segment in the minority phase self-assembled into a wormlike mesogenic domain in the bulk films. Such block copolymer films exhibited stability and transparency by eliminating the scattering of visible light, indicating their potential application as photoresponsive functional materials. Although wormlike morphologies have been obtained in micelles from block copolymer solutions, to the best of our knowledge, such wormlike nanostructures have never been explored in bulk films.