Achieving High Performance Electric Field Induced Strain: A Rational Design of Hyperbranched Aromatic Polyamide Functionalized Graphene-Polyurethane Dielectric Elastomer Composites
Achieving High Performance Electric Field Induced Strain: A Rational Design of Hyperbranched Aromatic Polyamide Functionalized Graphene-Polyurethane Dielectric Elastomer Composites
复制标题
实现高性能电场诱导应变：超支化芳香族聚酰胺功能化石墨烯-聚氨酯介电弹性体复合材料的合理设计
DOI：
10.1021/jp508864b
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发表时间：
2015-03-26
影响因子：
3.3
通讯作者：
Wang, Xiaoliang
中科院分区：
文献类型：
--
作者：
Chen, Tian;Qiu, Jinhao;Wang, Xiaoliang
介电弹性体具有变形量大、重量轻、机械柔顺性好、成本低等优点，在微机电系统（MEMS）柔性驱动器中具有很大的应用潜力。这些弹性体的低介电常数需要相当高的电压电场，这极大地限制了它们的应用。在这项工作中，一种包含超支化芳族聚酰胺官能化石墨烯（HAPFG）填料嵌入到聚氨酯（PU）介电弹性体基质的柔性微致动器进行了描述。合理设计的HAPFG片材在PU基体中分散均匀，并通过氢键偶联与PU基体形成较强的粘合。因此，HAPFG-PU复合材料具有高介电性能和低损耗模量。利用Fotonic传感器研究了超支化芳香聚酰胺功能化石墨烯对高压电场诱导应变的影响。通过施加不同的交流电场，讨论了复合材料的高电场响应。此外，HAPFG-PU复合材料之间的击穿强度与纯PU进行了比较。
Dielectric elastomers have great potentials as flexible actuators in micro-electromechanical systems (MEMS) due to their large deformation, light weight, mechanical compliancy, and low cost. The low dielectric constant of these elastomers requires a rather high voltage electric field, which has greatly limited their applications. In this work, a diaphragm-type flexible microactuator comprising a hyperbranched aromatic polyamide functionalized graphene (HAPFG) filler embedded into the polyurethane (PU) dielectric elastomer matrix is described. The rational designed HAPFG sheets exhibits uniform dispersion in PU matrix and strong adhesion with the matrix by hydrogen-bond coupling. Consequently, the HAPFG-PU composites possess high dielectric performance and low loss modulus. The effect of hyperbranched aromatic polyamide functionalized graphene on high voltage electric field induced strain was experimentally investigated using the Fotonic sensor. The high electric field response of the composite was discussed by applying different kinds of alternating-current field. In addition, a comparison of the breakdown strength between the HAPFG-PU composite and the pure PU was carried out.