基于扭曲晶界A相/胆甾相共存的液晶复合材料的制备及宽波反射性能研究

调制具有较高清亮点温度的胆甾相（Ch相）液晶复合材料，研究手性化合物的化学结构及组成等因素对手性化合物与向列相（N相）液晶的相容性、Ch相温域的影响规律。进一步调制具有较宽扭曲晶界A相（TGBA相）温域的液晶复合材料，研究手性化合物、N相及SmA相液晶的化学结构及组成、液晶复合材料中SmA相和Ch相的温域等因素对TGBA相温域、螺距尺寸及反射波长的影响规律。采用紫外分步聚合的聚合方式，制备TGBA相/Ch相共存的液晶复合材料，研究液晶复合材料中各组分的化学结构及组成、紫外光照射强度及时间、聚合温度等因素对聚合物网络的微观结构的影响规律，进一步研究液晶复合材料中聚合物网络的微观结构、螺距微区分布、各组分材料的化学结构及组成等因素对TGBA相/Ch相共存的液晶复合材料的宽波反射性能的影响规律，并揭示相关机理，为开发可适用于不同反射波长及反射波宽的液晶宽波反射材料提供实验方法和理论依据。

Cholesteric liquid crystal composites with higher clearing point will be prepared. The influences of the chemical structures and the compositions of chiral compounds on the compatibility of chiral compounds and nematic liquid crystals, the temperature range of cholesteric phase will be investigated. Furthermore, liquid crystal composite materials with wider temperature range of twist grain boundary A phase will be prepared. The influences of the chemical structures and the compositions of chiral compounds, nematic liquid crystals and smectic liquid crystals, the temperature range of smectic phase and cholesteric phase on the temperature range of twist grain boundary A phase, the pitch length and the reflection wavelength will be investigated. Liquid crystal composite materials based on the coexistence of twist grain boundary A and cholesteric phase will be prepared by stepwise UV polymerization. The influences of the chemical structures and the compositions of each component, UV light intensity and time, curing temperature on the microstructures of polymer network will be investigated. Furthermore, the influences of the microstructures of polymer network, microdistributions of pitch, the chemical structures and the compositions of each component on the broadband reflectance properties of liquid crystal composite materials based on the coexistence of twist grain boundary A and cholesteric phase will be investigated, and the correlative mechanisms will be revealed, to provide the experimental method and theoretical guidance for broadband reflective liquid crystal materials with different reflection wavelength and wavelength range.