Double UV polymerisation with variable temperature-controllable selective reflection of polymer-stabilised liquid crystal (PSLC) composites
Double UV polymerisation with variable temperature-controllable selective reflection of polymer-stabilised liquid crystal (PSLC) composites
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聚合物稳定液晶 (PSLC) 复合材料的可变温控选择性反射双 UV 聚合
DOI：
10.1080/02678292.2016.1172351
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发表时间：
2016
期刊：
影响因子：
2.2
通讯作者：
Yang Huai
中科院分区：
文献类型：
--
作者：
Xiao Ling;Cao Hui;Sun Jian;Wang Huihui;Wang Dong;Yang Zhou;He Wanli;Xiao Jiumei;Ding Hangjun;Yang Huai
本文提出了一种利用紫外自由基聚合和紫外阳离子聚合相结合的方法制备宽带反射型液晶薄膜的方法。由于手性掺杂剂的螺旋扭转力（HTP）随温度升高而降低，并且UV引发的自由基聚合的聚合速率比UV引发的阳离子聚合快，因此通过调节温度，获得具有不均匀螺距分布的宽带反射膜。通过扫描电子显微镜（SEM）观察了宽带反射膜的聚合物网络的断裂表面，这揭示了不均匀的间距分布的存在。此外，还研究了单体浓度、紫外光强度和紫外光固化时间对树脂不均匀分布的影响。图形摘要
ABSTRACT In this study, a method of preparing wide-band reflection cholesteric liquid crystals (CLCs) films by UV-radical polymerisation in combination with UV-cationic polymerisation is proposed. Because the helical twisting power (HTP) of the chiral dopant decreases with increasing temperature and the polymerisation rate of UV-initiated free radical polymerisation is faster than UV-initiated cationic polymerisation, by adjusting the temperature, broadband reflective films with non-uniform pitch distribution are obtained. The fractured surface of the polymer network of the broadband reflective films is observed by scanning electron microscopy (SEM), which reveals the presence of non-uniform pitch distribution. In addition, the influences of monomer concentration, UV light intensity and UV curing time on the consequent non-uniform pitch distribution have been studied. GRAPHICAL ABSTRACT