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.

中文翻译：

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防伪标签用手指测温液晶复合膜

经济的发展增加了对防伪技术的需求，传统技术为大众所熟知，需要新的、更有效的技术。在这项研究中，设计并制备了一系列含有侧链液晶聚合物和小分子量液晶 (LC) 的液晶混合物。LC 混合物的相变行为和自组装结构通过差示扫描量热法、偏振光学显微镜和小角度 X 射线衍射的组合进行研究。混合物膜的光学特性通过UV/VIS/IR光谱研究表征。结果表明，在手指温度控制下，所得薄膜在透明、散射和选择性反射之间表现出不同的光学模式。所以，通过引入共存的热或光聚合物分散网络，成功地展示了一种集成了明显的光开关模式和增强的强度和韧性的液晶复合薄膜。该研究为设计和制备实用的液晶防伪材料提供了通用策略。本研究制备了一种指纹温度检测防伪标签原型，并对其温度响应特性进行了验证。该研究为设计和制备实用的液晶防伪材料提供了通用策略。本研究制备了一种指纹温度检测防伪标签原型，并对其温度响应特性进行了验证。该研究为设计和制备实用的液晶防伪材料提供了通用策略。本研究制备了一种指纹温度检测防伪标签原型，并对其温度响应特性进行了验证。