Abstract
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.
Highlights
Consumption upgrading is happening with the development of the global economy
Huang et al reported a kind of color tunable composite film of carbon nanotubes (CNTs) and anodic aluminum oxide (AAO) [11]
Two exothermic peaks at about 41.60 ◦ C and about 163.47 ◦ C were detected in the differential scanning calorimetry (DSC) curve of sample 3HG8020 during the first cooling scan, and no other peaks shown indicated that the polymer only had one liquid crystal (LC) phase
Summary
Consumption upgrading is happening with the development of the global economy. The demand for new anti-counterfeiting technologies has begun to emerge and new ones have been invented to meet the demand. The first-line anti-counterfeiting technology is a kind of anti-counterfeiting technology that could show obvious optical features through direct observation It has characters such as a simple identification method, no need for any instrument, and wide application scenarios. Side-chain liquid crystal co-polymer (SCLCP) has the characteristics of periodic arrangement structure of small molecular LC, and has the good processability and mechanical properties of polymer materials [19,20,21]. It is a good choice for anti-counterfeiting applications. The synthetic SCLCPs could be mixed to prepare materials with different reflective wavelengths to meet the needs of different application scenarios
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