用偏光显微术研究聚合物分散液晶压光效应膜

Polarization Microscopy Study on Piezo-Optical Effect of Polymer Dispersed Liquid Crystal Films

制备出大液晶微滴的具有压光效应的聚合物分散液晶膜,给出样品按压前后偏光显微镜对比照片。提出压缩液晶微滴模型,采用Fortran软件模拟计算了压光效应液晶微滴双折射透光率分布,用Origin软件作图,计算结果绘图与偏光显微镜图片一致。定义按压后液晶微滴圆球变扁球的扁平度,计算按压后序参数与扁平度的关系,说明按压作用使液晶微滴形同单轴晶体,进而对聚合物分散液晶膜压光效应给出原理解释。

The large size liquid crystal droplet of polymer dispersed liquid crystal （PDLC） films with piezo-optical effect is prepared, the photographs of polarization microscope with press compared with that one without press are given. The model of compressed liquid crystal droplet is proposed, the order of flattening that liquid crystal droplet turns from pellet to the flat one after compressed is defined, the relation between the order parameter and order of flattening with compressing is calculated. The transmittance distribution of liquid crystal droplet birefringence is simulated in Fortran, and the graph is made with Origin software, the results of computation and graph plotting conform with photographs of polarization microscope compressed, further more, the principle of piezo-optical effect of polymer dispersed liquid crystal films is presented.