Duan Man-Yu, Cao Hui, Wu Yong, Li Er-Li, Wang Hui-Hui, Wang Dong, Yang Zhou, He Wan-Li, Yang Huai
State Key Laboratory for Advanced Metals and Materials, Department of Materials Physics and Chemistry, School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
Center for Nanochemistry (CNC), College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Phys Chem Chem Phys. 2017 Jan 18;19(3):2353-2358. doi: 10.1039/c6cp07066c.
In this study, we demonstrate a novel method for fabricating polymer stabilized cholesteric liquid crystal (PSCLC) films with non-uniform pitch distribution by utilizing two kinds of photo-induced processes. Based on the large HTP temperature dependence of a chiral dopant, polymer networks were formed at two distant temperature points in sequence. The influence of the polymerization conditions on the reflectance properties of PSCLCs before and after polymerization was investigated. The results strongly suggest that the location and bandwidth of the reflection band can be controlled preferably by adjusting the ultraviolet light intensity and irradiation time of UV-light. In addition, the morphology of the polymer network in the composites was studied using scanning electron microscopy (SEM). A general correlation between polymerization conditions, the network morphology, and the reflective region will be outlined.
在本研究中，我们展示了一种通过利用两种光诱导过程来制造具有非均匀间距分布的聚合物稳定胆甾相液晶（PSCLC）薄膜的新方法。基于手性掺杂剂的大HTP温度依赖性，聚合物网络依次在两个不同的温度点形成。研究了聚合条件对聚合前后PSCLC反射特性的影响。结果有力地表明，通过调节紫外光强度和紫外光照射时间，可以较好地控制反射带的位置和带宽。此外，使用扫描电子显微镜（SEM）研究了复合材料中聚合物网络的形态。将概述聚合条件、网络形态和反射区域之间的一般相关性。
