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用偏光显微镜,光学衍射,电子显微镜(透射电镜,扫描电镜)等方法研究了全芳香族热致液晶在形变时从微区结构到棒状结构转变的全部过程。分析了形变下结构特征与分子长轴方位周期性变化的关系。电镜图象表明,形态结构的基本单元是由棒形分子规则排列形成的微区,微区进一步排列形成麻花棒形结构,这种结构主要贡献于热致液晶高聚物的自增强作用。提出了用电镜方法测全芳族热致液晶高聚物分子量的可能性,初步讨论了分子量和取向关系。
The whole process of all-aromatic thermotropic liquid crystal (LCD) transition from micro-structure to rod-like structure was studied by means of polarizing microscope, optical diffraction and electron microscope (TEM, SEM) The relationship between the structural features and the periodic changes of the long axis orientation is analyzed. Electron microscopy images show that the basic unit of the morphological structure is a micro-zone formed by the regular arrangement of rod-shaped molecules. The micro-zones are further arranged to form a twisted rod-shaped structure. This structure mainly contributes to the self-enhancement effect of the thermotropic liquid crystal polymer. The possibility of using electron microscopy to measure the molecular weight of all-aromatic thermotropic liquid crystal polymer was discussed. The relationship between molecular weight and orientation was discussed preliminarily.