具有双螺旋结构胆甾相液晶聚合物复合材料研究进展

Research Progress in Cholesteric Liquid Crystal Polymer Composites with a Dual Circularly Polarized Light Reflection Band

胆甾相液晶(Ch-LC)的特征螺旋结构使其具有选择性反射和圆二向色性的光学性质,其反射强度被限制在自然光(非偏振光)的50%。若Ch-LC聚合物复合体系中同时具有左右双螺旋结构,那么Ch-LC的反射强度将超过非偏振光50%的上限,从而可制备具有高反射通量的Ch-LC薄膜。具备这种特性的反射器件在无偏振片反射式显示器和需要智能控制太阳光的建筑、汽车、温室等领域具有潜在的应用前景。本文结合作者在该领域的研究工作,综述了近年来可同时反射左右旋圆偏振光的胆甾相液晶聚合物薄膜材料研究进展,并对该类材料未来的发展提出了展望。

The special helical structure of cholesteric liquid crystal （Ch-LC） make them characteristic optical properties of selective reflection and circular dichroism, the reflection intensity is limited to 50% of natural light （non-polarized light）. If Ch-LC/polymer composites have double helical structure, the reflection intensity of the Ch-LC will be more than 50% maximum limitation of the non- polarized light, thus a high reflectivity flux of Ch-LC film will be prepared. This characteristic can extend practical applications of Ch-LCs used as reflector for reflective polarizer-free liquid crystal display and smart windows in buildings and vehicles, greenhouses and other applications in which light management is desired. This paper reviews the research progress of Ch-LC polymer composites reflecting double circular polarized light, and gives an outlook for the development of this field.