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Polymers 2018, 10(4), 453; https://doi.org/10.3390/polym10040453

Angular Photochromic LC Composite Film for an Anti-Counterfeiting Label

1
Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
2
Key Laboratory of Polymer Chemistry and Physics of Ministry of Education, Peking University, Beijing 100871, China
3
School of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 620100, China
4
Department of Applied Statistics and Science, Xijing University, Xi’an 710123, China
*
Authors to whom correspondence should be addressed.
Received: 16 March 2018 / Revised: 7 April 2018 / Accepted: 14 April 2018 / Published: 18 April 2018
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Abstract

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. View Full-Text
Keywords: liquid crystal; anti-fake; cholesteric phase; side-chain liquid crystal polymers liquid crystal; anti-fake; cholesteric phase; side-chain liquid crystal polymers
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Gao, Y.; Yao, W.; Sun, J.; Li, K.; Zhang, L. Angular Photochromic LC Composite Film for an Anti-Counterfeiting Label. Polymers 2018, 10, 453.

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