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首页> 外文期刊>Journal of Microelectromechanical Systems >Physical Properties of Anisotropically Swelling Hydrogen-Bonded Liquid Crystal Polymer Actuators
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Physical Properties of Anisotropically Swelling Hydrogen-Bonded Liquid Crystal Polymer Actuators

机译：各向异性溶胀氢键液晶聚合物致动器的物理性质

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摘要

Glassy polymeric actuators are described which reversibly deform in response to changes in pH and/or the presence of water. Hydrogen-bonded liquid crystalline monomers act as precursors, and these materials are photopolymerized (without mechanical drawing) into monodomain nematic networks. We discuss the influence of film composition, polymerization conditions, and chemical treatments on the properties of these anisotropic networks. We show that large-amplitude reversible motion can be generated in response to small changes in pH. Pretreatment in basic solutions also activates a response to water, and this effect is investigated in detail. Elastic moduli, which are directly related to the generation of work, have not been reported previously, and therefore particular attention is given to mechanical properties. A marked anisotropy is observed in the moduli parallel and perpendicular to the nematic director. We find that pretreatment in basic solutions reduces this anisotropy yet preserves magnitudes on the order of 2 GPa. Employing complex director profiles (such as the twisted configuration), extremely large amplitude bending-mode deformations are induced in response to small pH changes, immersion in water, or variations in the relative humidity. Since the elastic moduli are large, work output significantly greater than conventional liquid crystal elastomers is predicted. 2006-0076
机译：描述了玻璃状聚合物致动器，其响应于pH的变化和/或水的存在而可逆地变形。氢键合液晶单体充当前体，并且这些材料被光聚合（没有机械拉伸）成单畴向列型网络。我们讨论了膜组成，聚合条件和化学处理对这些各向异性网络性能的影响。我们表明，可以响应pH的微小变化而产生大幅度的可逆运动。在碱性溶液中进行预处理还会激活对水的响应，对此效果进行了详细研究。与功的产生直接相关的弹性模量以前没有被报道过，因此特别注意机械性能。在平行和垂直于向列导向器的模量中观察到明显的各向异性。我们发现，在基本溶液中进行预处理可以减少这种各向异性，但仍可将幅度保持在2 GPa左右。使用复杂的导向器轮廓（例如扭曲的配置），响应较小的pH值变化，浸入水中或相对湿度变化，会引起极大幅度的弯曲模式变形。由于弹性模量大，因此预计功输出将显着大于常规液晶弹性体。 2006-0076

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