Side-Chain Liquid Crystal Co-Polymers for Angular Photochromic Anti-Counterfeiting Powder and Fiber

Crystals

Lanying Zhang¹  Yanzi Gao²  Jin Zhang²  Ke Feng² 

[1] Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China;School of Economics, Peking University, Beijing 100871, China;

关键词: liquid crystal;    anti-counterfeiting;    cholesteric phase;    side-chain liquid crystal co-polymers;   

DOI  :  10.3390/cryst10020128

来源: DOAJ

【 摘 要 】

Anti-counterfeiting technologies with the features of easy distinguishability, high cost performance, and good processability are needed to meet the demands of a market during the consumption upgrading moment. A series of side-chain liquid crystal co-polymers (SCLCPs) are designed, synthesized, and blended, and the preparation of a series of angular photochromic materials that have different center reflection wavelengths in the visible and near infra-red region is reported in this article. Differential scanning calorimetry and polarized optical microscopy were utilized to characterize the phase transition behaviors and self-assembling structures of the SCLCPs. The selective reflection properties were characterized with a UV/VIS/IR spectrum study and further verified by scanning electron microscopy. The results showed that the SCLCPs had the desired reflection wavelengths and thermal stability. The SCLCPs could easily form a planar texture of cholesteric liquid crystal and, depending on the good processability, anti-counterfeiting powders and fibers with angular photochromic features were prepared and characterized to prove the potential applications of the SCLCPs in anti-counterfeiting labels.

【 授权许可】

Unknown