Photo-switching Behavior of Microphase Separated Structure in Liquid Crystalline Azobenzene Block Copolymers Possessing Different Poly(alkyl methacrylate) Blocks
Photo-switching Behavior of Microphase Separated Structure in Liquid Crystalline Azobenzene Block Copolymers Possessing Different Poly(alkyl methacrylate) Blocks
复制标题
具有不同聚甲基丙烯酸烷基酯嵌段的液晶偶氮苯嵌段共聚物中微相分离结构的光开关行为
DOI：
10.1080/15421406.2015.1075356
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
T. Seki
中科院分区：
文献类型：
--
作者：
M. Sano;T. Murase;M. Hara;S. Nagano;Y. Shinohara;Y. Amemiya;T. Seki
我们最近报道了嵌入在由无定形聚甲基丙烯酸丁酯（PBMA）和光响应LC偶氮苯（Az）嵌段组成的二嵌段共聚物薄膜中的液晶（LC）相中的微相分离（MPS）圆柱结构的分级结构的光切换过程。在本工作中，引入了聚甲基丙烯酸己酯（PHMA）和聚甲基丙烯酸十八烷基酯（PODMA）的同系聚甲基丙烯酸烷基酯作为圆柱体形成聚合物嵌段。这些聚合物中的Az介晶和MPS圆柱体沿面内方向排列，并且通过改变LPL照射方向来光切换排列。含有PODMA的嵌段共聚物表现出与含有PHMA或PBMA的嵌段共聚物不同的重新取向行为。有人认为圆柱形聚合物的粘度或流动性影响光开关取向行为。
We have recently reported the photo-switching process of hierarchical structures of microphase separated (MPS) cylindrical structures embedded in a liquid crystalline (LC) phase in a film of a diblock copolymer composed of amorphous poly(butyl methacrylate) (PBMA) and a light responsive LC azobenzene (Az) blocks. In the present work, homologous poly(alkyl methacrylate) of poly(hexyl methacrylate) (PHMA) and poly(octadecyl methacrylate) (PODMA) are introduced as the cylinder forming polymer block. The Az mesogens and MPS cylinders in these polymers were aligned in the in-plane direction, and the alignments were photo-switched by changing LPL irradiation direction. The PODMA containing block copolymer exhibited a different reorientation behavior from PHMA or PBMA contained block copolymer. It was suggested that the viscosity or fluidity of cylindrical polymer affect the photoswitching alignment behavior.