用于电响应红外反射窗的液晶聚合物薄膜特性研究

提出了一种红外反射器件,通过载体液晶在电场下的转向控制胆甾型液晶聚合物粒子在器件中的排布方向,实现红外反射与透射之间切换.其中,胆甾型液晶聚合物粒子是实现红外反射关键.介绍了胆甾型液晶聚合物薄膜的制备方法,并采用超声波破碎的方法制备液晶粒子.研究了液晶混合物中不同比例的交联剂液晶1对液晶聚合物薄膜脆性和反射波段的影响,发现当液晶1占100%时,液晶聚合物薄膜的脆性最大,且其清亮点最高,并且薄膜的反射波段随着液晶1比例的增加而向短波方向偏移.同时,研究了薄膜厚度对液晶聚合物粒子的影响,发现液晶薄膜厚度越小,制备的液晶聚合物粒子越小且越均匀,其制成的器件电驱动性更好.该研究有利于帮助电响应红外反射窗的性能优化.

Properties of Liquid Crystal Polymer Films for Electricity-responsive IR Reflective Windows

A novel infrared reflective device was proposed.The alignment direction of cholesteric liquid crystal particles in the device are driven by the diversion of host liquid crystal,which can realize the work state switch from infrared reflection to transmission.So the cholesteric liquid crystal particle is the key of this device.The preparation method of cholesteric liquid crystal polymer film was introduced,and the liquid crystal polymer particles were obtained by ultrasonic processor.The influence of different proportions crosslinker liquid crystal 1 on liquid crystal film brittleness and reflection band was studied.It was found that when the proportion of crosslinker liquid crystal 1 is 100％,the brittleness of liquid crystal film is maximum and the clear point is the highest.In addition,the reflection band of liquid crystal films is getting closer to shortwave with crosslinker liquid crystal 1 concentration increasing.At last,the influence of the liquid crystal film thickness on liquid crystal polymer particles was conducted.It was found that the size of liquid crystal polymer particles became smaller and evener with the film thinning.This work will support the optimization of electricity-responsive infrared reflective windows performance.