Wang Tingting, Zhao Jinghua, Wu Limin, Liu Wei, Li Yi, Yang Yonggang
State and Local Joint Engineering Laboratory for Novel Functional Polymeric Materials, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, China.
School of Environmental Science and Engineering, Yancheng Institute of Technology, Yancheng, Jiangsu 224051, P. R. China.
ACS Appl Mater Interfaces. 2024 Apr 10;16(14):18001-18007. doi: 10.1021/acsami.4c00865. Epub 2024 Mar 26.
Cholesteric liquid crystal polymer network (CLCN) films with a single reflection band have found applications for decoration and anticounterfeiting. The CLCN films with double reflection bands were more suitable for these applications. Herein, they were prepared by using thermochromic cholesteric liquid crystals (CLCs) through a two-step photopolymerization approach. At the first step, due to oxygen inhibition, the CLC monomers near the substrate surface were polymerized at a certain temperature. At the second step, those near the air were polymerized at another temperature. The wavelengths of these two reflection bands of the CLCN film were dominated by the two polymerization temperatures. Based on this approach, patterns with composite colors were prepared, which were suitably applied for decoration. Moreover, a double-layered CLCN film with a broad reflection band was prepared that could potentially be applied for displays.
具有单一反射带的胆甾相液晶聚合物网络（CLCN）薄膜已在装饰和防伪领域得到应用。具有双反射带的CLCN薄膜更适合这些应用。在此，它们是通过使用热致变色胆甾相液晶（CLC），采用两步光聚合方法制备的。第一步，由于氧抑制作用，在一定温度下使靠近基底表面的CLC单体发生聚合。第二步，使靠近空气的那些单体在另一个温度下发生聚合。CLCN薄膜这两个反射带的波长由这两个聚合温度决定。基于此方法，制备了具有复合颜色的图案，这些图案适合用于装饰。此外，还制备了一种具有宽反射带的双层CLCN薄膜，其有可能应用于显示器。
