酞菁-聚硅氧烷衍生物(PCPS)六方柱状相的结构和缺陷

R. Ries, G. Lieser, S. Schwiegk, G. Wegner
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引用次数: 4

摘要

采用溶液浇铸法制备了具有不同取代模式的酞菁-聚硅氧烷(pps)的烷基氧基衍生物。经过这段时间的处理后,它们形成溶性六角形柱状中间相。在“冷冻”状态(溶剂蒸发)下,用光学显微镜和电子显微镜分析了织构和缺陷。除了单个分子占据的空间外,PCPS衍生物在液晶状态下的行为没有显着差异。所调查样品的侧链太短,无法排序,但在冷冻液晶状态下,主链是登记的。光学显微镜和电子显微镜都提供了分子轨迹具有优先取向的波动的证据。典型的六方柱状相缺陷,如各种来源和可发展区域的壁。与波动一起,横向边缘位错发生,可以通过高分辨率电子显微镜证明。插入的点阵半平面使系统在弯曲导向场中使高持久性分子的弹性能最小化。
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Textures and defects of the hexagonal columnar phase of phthalocyaninato-poly(siloxane) derivatives (PCPS)

Samples of alkyloxy derivatives of phthalocyaninato-poly(siloxane) (PCPS) with various patterns of substitution were prepared by solution casting. After this history of treatment they form lyotropic hexagonal columnar mesophases. Textures and defects were analyzed in the “frozen” state (with the solvent evaporated) by optical and electron microscopy. With the exception of the space occupied by a single molecule, significant differences of the behavior in the liquid crystalline state were not found among the PCPS derivatives. The side chains of the samples under investigation are too short to be ordered but in the frozen liquid crystalline state the main chains are in register. Both optical and electron microscopy provide evidence for undulations of the molecular trajectories with preferential orientation. Defects typical of hexagonal columnar phases, e.g. walls of various origin and developable domains, where observed. Together with the undulations, transversal edge dislocations occur, as can be demonstrated by high resolution electron microscopy. Inserted lattice half-planes enable the system to minimize the elastic energy of the highly persistent molecules in the bent director field.

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