聚合物分散液晶膜的压光效应

Piezo-Optical Effect of Polymer Dispersed Liquid Crystal Films

报道了一种聚合物分散液晶(PDLC)膜在压力作用下从散射膜变为透明膜的实验现象,建议称之为PDLC膜的压光效应。介绍了与压光效应相关的PDLC的应变液晶、剪切液晶和拉伸液晶等概念;给出PDLC压光效应膜样品照片,偏光显微镜照片,电光特性光谱分析和压光效应光谱分析。提出PDLC膜压光效应的原理猜想,给出对PDLC膜光学性质的重新认识,认为只要每个液晶微滴中液晶分子取向一致了,无论不同微滴间液晶分子取向一致与否,PDLC膜都将透明。PDLC膜压光效应将对液晶基础科学提出新课题,将在许多不用加电的新型压光器件(按压窗、功能玻璃和光纤压力传感器等)领域有应用前景。

It is reported that polymer dispersed liquid crystal（PDLC） films are transparency when pressed,and it is called piezo-optical effect of PDLC films.The concepts of stressed liquid crystal,sheared liquid crystal and stretched liquid crystal for PDLC films are described respectively.The pictures of piezo-optical effect,polarized photographs of PDLC films,spectral analysis of electro-optical property and spectral analysis of piezo-optical effect are given.The principle of piezo-optical effect of PDLC films is also proposed,which believes that only if liquid crystal molecules in each micro-droplet are well orientated,the PDLC films will show transparency,no matter liquid crystal molecules in different droplets are well orientated or not.The piezo-optical effect of PDLC films poses questions to basic sciences of liquid crystal and may be applied in a lot of new press-optical applications without electricity（press-windows,functional glass,optical fiber press sensor,etc.）.