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New Dielectric Elastomers with Variable Moduli

机译：可变模量的新型介电弹性体

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摘要

Dielectric elastomers have been widely investigated for muscle-like soft actuators and capacitive sensors. Mechanical properties play a central role in the performances of the active material. Most elastomers have specific moduli pre-determined by the polymers' molecular structures, which are not suitable for applications in changing working conditions as natural muscles are capable of. Here new dielectric elastomers are described exhibiting variable moduli controlled via thermal treatment. The elastomers contain furan-maleimide Diels-Alder adduct moieties to administer the crosslinking densities of the elastomeric networks via reversible Diels-Alder/retro-Diels-Alder cycloaddition reaction, resulting in changes in the elastomers' moduli. One of the synthesized elastomers has moduli that can be controlled between 0.17 and 0.52 MPa incrementally and reversibly. Capacitive strain sensors based on this elastomer can be operated in both rigid and soft modes to achieve variable sensing response up to 30% linear strain. Actuators were fabricated and operated in both high strain mode (35% actuation area strain at 65 MV m(-1)) and high force output mode (0.55 MPa at 104 MV m(-1)). The elastomers can exhibit a range of stress-strain outputs in similar fashion as muscle.
机译：介电弹性体已被广泛研究用于类似肌肉的软致动器和电容式传感器。机械性能在活性材料的性能中起着核心作用。大多数弹性体具有由聚合物的分子结构预先确定的特定模量，这不适合天然肌肉能够改变工作条件的应用。这里描述了新的介电弹性体，其表现出通过热处理控制的可变模量。弹性体包含呋喃-马来酰亚胺的Diels-Alder加合物部分，以通过可逆的Diels-Alder / retro-Diels-Alder环加成反应来控制弹性体网络的交联密度，从而导致弹性体的模量发生变化。合成的弹性体之一的模量可以递增且可逆地控制在0.17和0.52 MPa之间。基于这种弹性体的电容应变传感器可以在刚性和软模式下运行，以实现高达30％线性应变的可变传感响应。执行器在高应变模式（65 MV m（-1）下为35％的致动区域应变）和高力输出模式（104 MV m（-1）下为0.55 MPa）下进行制造和操作。弹性体可以以与肌肉类似的方式表现出一系列的应力-应变输出。

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