光敏液晶弹性体的温度调制光机械驱动
Temperature-Modulated Photomechanical Actuation of Photoactive Liquid Crystal Elastomers
摘要：
光活性液晶弹性体是嵌有发色团如偶氮苯的液晶介晶的聚合物网络。当它们通过光化学反应被特定波长的光照射时会发生大的变形，激发了令人兴奋的新应用。然而，尽管最近在这些材料的实验和理论方面取得了进展，但通过各种分子到介观尺度过程对其光机械致动的温度效应的基本理解仍然在很大程度上未被探索。本文构建了一个理论模型来研究这种温度调制的光机械驱动，通过整合不同的温度依赖过程到一个连续的框架。该模型研究了一种特殊的工作条件下，材料受到单轴拉伸载荷，规定的温度，和偏振光照明。我们探讨了系统的自由能景观和单轴应力拉伸响应在各种条件下。我们利用在一个单一的光致动的温度和光的个人控制之间的耦合几个工作场景，包括温度调制的光致动管理单元通过不稳定性，具体的工作，和阻塞应力。我们研究了温度依赖的发色团反向异构化对光机械驱动的影响。这些结果有望激发未来各种光机械材料系统的基础研究和新应用。
英文摘要：
Photoactive liquid crystal elastomers are polymer networks of liquid crystal mesogens embedded with chromophores like azobenzene. They undergo large deformation when illuminated by light of a certain wavelength through photochemical reaction, inspiring exciting new applications. However, despite the recent progresses in both the experiment and theory of these materials, the fundamental understanding of the temperature effect on their photomechanical actuation through various molecular-to-mesoscale processes have remained largely unexplored. This paper constructs a theoretical model to investigate this temperature-modulated photomechanical actuation, by integrating different temperature-dependent processes into a continuum framework. The model studies a special working condition where the material is subjected to a uniaxial tensile load, a prescribed temperature, and a polarized light illumination. We explore the free energy landscape of the system and the uniaxial stress-stretch responses under various conditions. We exploit the coupling between individual controls of temperature and light in a single photomechanical actuation for several working scenarios, including the temperature-modulated photomechanical snap-through instability, specific work, and blocking stress. We study the effect of the temperature-dependent backward isomerization of chromophores on the photomechanical actuation. These results are hoped to motivate future fundamental studies and new applications of various photomechanical material systems.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
