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.
Highlights
Due to the fast development of the global economy during the last several decades, counterfeiting is creating more and more profit
According to the results described above, the liquid crystals (LCs) mixture film of NB1GJ1 exhibited abundant optical modes under body-temperature regulation, which could be favorable for application in the optical modes under body-temperature regulation, which could be favorable for application in the intelligent anti-counterfeiting field
The maximum counterfeiting labels was nearly two times of that of the LC of mixture film of NB1GJ1, indicating that elongation of the composite film for anti-counterfeiting labels was nearly two times of that of the the polymer network sufficiently improved the toughness of the film
Summary
Due to the fast development of the global economy during the last several decades, counterfeiting is creating more and more profit. Emissions from the fluorophore could be observed when the bisthienylethene moiety was in its open-ring form, while under UV irradiation, fluorescence quenching happened Based on these properties, a security image could be fabricated using a bisthienylethene-bridge embedded polymethylmethacrylate (PMMA) film, which may find potential application in the field of security recording. Zschieschang et al described a carefully designed organic thin-film transistor (TFT) that was embedded in a banknote [12] Using this polymer ferroelectric memory device, the fabrication of organic circuits on banknotes will become a promising approach for developing organic electronic-based anti-counterfeiting systems. The patterns of the schlieren textures in different cells were evaluated, and the maximum coefficients were 0.09, indicating that their patterns in different cells were unique These results suggest that the non-uniform patterns of schlieren textures have potential applications in anti-counterfeiting materials. We strongly believe that it could offer an innovative insight into the design and preparation of LC anti-counterfeiting materials for practical use
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