Preparation of Liquid Crystal Film Capable of Shielding Visible Light Band by Two‐Phase Coexistence,Journal of Polymer Science Part A: Polymer Chemistry

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Preparation of Liquid Crystal Film Capable of Shielding Visible Light Band by Two‐Phase Coexistence
Journal of Polymer Science Part A: Polymer Chemistry Pub Date : 2020-01-20 , DOI: 10.1002/pol.20190133
Erli Li ₁ , Dongdong Zhang ₁ , Hui Cao ₁ , Yinjie Chen ₂ , Limin Zhao ₁ , Ping Gan ₁ , Zhou Yang ₁ , Dong Wang ₁ , Wanli He ₁

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A broadband reflective film covering the visible region is prepared by twice crosslinking polymerization of active monomer at different temperatures. The system is transformed from cholesteric phase to twist grain boundary A phase with the decrease of temperature. Based on the temperature dependence of pitch in two‐phase coexistence system, the polymer networks formed by free‐radical polymerization fix a part of small pitch when the system is in cholesteric phase at high temperatures, and then the large pitch is fixed by cationic polymerization when system is in twist grain boundary A phase at low temperatures. The non‐uniform distribution of pitch is formed in the system so that the reflection band of the film is broadened.

中文翻译：

两相共存制备可屏蔽可见光波段的液晶薄膜

通过在不同温度下使活性单体两次交联聚合来制备覆盖可见区的宽带反射膜。随着温度的降低，系统从胆甾相转变为扭曲晶界A相。基于两相共存体系中沥青的温度依赖性，当自由基体系在高温下处于胆甾相时，自由基聚合形成的聚合物网络固定一部分较小的沥青，然后通过阳离子聚合固定大间距当系统在低温下处于扭曲晶界A相时。在系统中会形成间距的不均匀分布，从而使薄膜的反射带变宽。

更新日期：2020-01-21

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