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- Title
Finger-Temperature-Detecting Liquid Crystal Composite Film for Anti-Counterfeiting Labels.
- Authors
Gao, Yanzi; Feng, Ke; Zhang, Jin; Zhang, Lanying
- Abstract
The development of the economy has increased the demand for anti-counterfeiting technologies, and with the traditional ones becoming known to the public, new and more effective ones are needed. In this study, a series of liquid crystal mixtures containing side-chain liquid crystal polymers and small-molecular-weight liquid crystals (LCs) were designed and prepared. The phase transition behavior and self-assembling structures of the LC mixtures were investigated by a combination of differential scanning calorimetry, polarized optical microscopy, and small-angle X-ray diffraction. The optical properties of the mixture film were characterized with a UV/VIS/IR spectrum study. The results reveal that the obtained film exhibited different optical modes between transparent, scattering, and selective reflection under finger-temperature control. Therefore, by the introduction of a coexisting thermal- or optical-polymer-dispersed network, a liquid crystal composite film with an integration of apparent optical switching modes and enhanced strength and toughness was successfully demonstrated. This research provides a versatile strategy for the design and preparation of liquid crystal anti-counterfeiting materials for practical use. In this study, a prototype finger-temperature-detecting anti-counterfeiting label was prepared, and its temperature-response property was demonstrated.
- Subjects
LIQUID crystal films; POLYMER liquid crystals; MICROSCOPY; OPTICAL properties; DIFFERENTIAL scanning calorimetry; OPTICAL switches
- Publication
Molecules, 2020, Vol 25, Issue 3, p521
- ISSN
1420-3049
- Publication type
Article
- DOI
10.3390/molecules25030521