Gao Yanzi, Yao Wenhuan, Sun Jian, Li Kexuan, Zhang Lanying
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China.
Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China.
Polymers (Basel). 2018 Apr 18;10(4):453. doi: 10.3390/polym10040453.
In the harsh application environment, improving the mechanical properties of liquid crystal materials is a fundamental and important problem in the design of anti-counterfeit materials. In this paper, by a stepwise polymerization of first, photo-polymerization and subsequently thermal-polymerization, a coexistent polymer dispersed network was first constructed in cholesteric liquid crystal materials containing a photo-polymerizable system of urethane acrylate and a thermo-polymerizable system of isocyanate. Results revealed that the coexistent polymer dispersed network exhibited largely enhanced mechanical performance, and the networks obtained by different methods had different contributions to the enhancement of the peel strength and toughness of the composite films. Then an angular photochromic anti-fake label based on a coexistent polymer dispersed network with enhanced mechanical and apparent angular discoloration characteristics, suitable for practical applications, was successfully achieved.
在恶劣的应用环境中，提高液晶材料的机械性能是防伪材料设计中一个基本且重要的问题。本文通过先光聚合后热聚合的逐步聚合方法，在含有聚氨酯丙烯酸酯光聚合体系和异氰酸酯热聚合体系的胆甾相液晶材料中首次构建了共存的聚合物分散网络。结果表明，共存的聚合物分散网络表现出大幅增强的机械性能，且通过不同方法获得的网络对复合膜的剥离强度和韧性增强有不同贡献。然后成功制备出一种基于共存聚合物分散网络的具有增强机械性能和明显角度变色特性的角度光致变色防伪标签，适用于实际应用。
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