Photocontrolled microphase separation of block copolymers in two dimensions.
Photocontrolled microphase separation of block copolymers in two dimensions.
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DOI：
10.1021/ja051200j
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发表时间：
2005-05
影响因子：
15
通讯作者：
Sohei Kadota;K. Aoki;Shusaku Nagano;T. Seki
中科院分区：
文献类型：
--
作者：
Sohei Kadota;K. Aoki;Shusaku Nagano;T. Seki
通过原子转移自由基聚合合成了一种新型ABA型三嵌段共聚物，其中A和B分别对应于含有聚甲基丙烯酸酯和聚环氧乙烷（PEO）的偶氮苯（Az）。 Langmuir-Blodgett 单分子层表现出特征性微相分离结构，具体取决于 Az 单元的异构化状态。反式到顺式异构化导致 Az 聚合物的域平行于保持宽度的棒的各向异性伸长。因此，成功地对由嵌段共聚物形成的纳米结构进行了二维光控制。提出了 Az 堆积和 PEO 构象的合理模型。
A novel ABA-type triblock copolymer, where A and B correspond to azobenzene (Az) containing polymethacrylate and poly(ethylene oxide) (PEO), respectively, was synthesized by atom transfer radical polymerization. Langmuir-Blodgett monolayers showed characteristic microphase separation structures depending on the isomerization state of the Az unit. The trans-to-cis isomerization induced an anisotropic elongation of the domain of the Az polymer parallel to the rod maintaining the width. Thus, successful photocontrol of nanostructures formed by the block copolymer in the two dimensions was performed. A plausible model for the Az packing and PEO conformation is proposed.