Direct Observation of Faceted Grain Growth of Hexagonal Cylinder Domains in a Side Chain Liquid Crystalline Block Copolymer Matrix
Direct Observation of Faceted Grain Growth of Hexagonal Cylinder Domains in a Side Chain Liquid Crystalline Block Copolymer Matrix
复制标题
DOI：
10.1021/ma4015643
复制
发表时间：
2013-11
期刊：
影响因子：
5.5
通讯作者：
M. Komura;Hideaki Komiyama;K. Nagai;T. Iyoda
中科院分区：
文献类型：
--
作者：
M. Komura;Hideaki Komiyama;K. Nagai;T. Iyoda
用原位原子力显微镜（AFM）研究了由聚环氧乙烷（PEO）和聚甲基丙烯酸酯（PMA）组成的液晶嵌段共聚物侧链上含偶氮苯（Az）介元的圆柱形微相分离结构（周期约20 nm）的形成。两亲液晶嵌段共聚物PEO-b- pma （Az）通过对各种衬底的热退火而无需任何预处理，在整个薄膜上形成正常取向的PEO圆柱体。掠入射小角x射线散射（GISAXS）分析用x射线折射效应的简单补偿方法证实了从⟨110⟩取向的bcc-sphere结构到正态取向的六柱结构的有序转变，这是冷却过程中同时发生的液体结晶。利用温度控制的原子力显微镜成功地观察了液晶诱导OOT中圆柱形微相分离晶粒的生长过程。微相分离晶粒w…
Formation of a cylindrical microphase-separated structure (∼20 nm periodicity) of a liquid crystalline block copolymer comprising poly(ethylene oxide) (PEO) and poly(methacrylate) (PMA) bearing azobenzene (Az) mesogens in the side chains was investigated by in situ atomic force microscopy (AFM). The amphiphilic liquid crystalline block copolymer, PEO-b-PMA(Az), forms normally oriented PEO cylinders over the entire film by thermal annealing of various substrates without any pretreatment. Grazing incidence small-angle X-ray scattering (GISAXS) analysis with the simple compensation method of X-ray refraction effect confirmed an order–order transition from a ⟨110⟩-oriented bcc-sphere structure to normally oriented hex-cylinder structure, which is simultaneous liquid crystallization in a cooling process. The growth of cylindrical microphase separation grains in the liquid-crystallization-induced OOT was successfully visualized in the film surface by temperature-controlled AFM. The microphase-separated grains w...