改性石墨烯/介电弹性体的制备及传感性能

Preparation and Sensing Property of Modified Graphene/Dielectric Elastomer

目的制备具有优异介电性能,可用于传感器的热塑性聚氨酯弹性体复合材料。方法使用十八烷基胺修饰氧化石墨烯片层,通过热处理工艺部分还原改性后的氧化石墨烯,利用溶液混合法将改性石墨烯分散到热塑性聚氨酯的基体中,通过絮凝-热压的方法成形,并测试其结构、介电性能及传感性能。结果十八烷基胺通过共价键的形式接枝到氧化石墨烯表面,X射线衍射表明,十八烷基胺通过表面接枝改性,增大了石墨烯片层的层间距。结论改性石墨烯填充的介电弹性体具有较高的介电常数和较低的介电损耗,且表现出良好的弯曲形变-介电敏感响应。

The work aims to fabricate thermoplastic polyurethane elastomer composites with superior dielectric properties used for sensors. Octadecylamine was used to modify the oxidized graphene lamella. The oxidized graphene was partly reduced and modified through the technology of heat treatment. The modified graphene was dispersed into the matrix of thermoplastic polyurethane in the solution blending method and then formed by means of flocculation-hot pressing. Structures, dielectric properties and sensing properties of this material were tested. The octadecylamine was grafted to the oxidized graphene surface in the form of covalent bond. The X-ray diffraction showed that the octadecylamine modified through surface grafting increased the lamellar spacing. The dielectric elastomer filled with the modified graphene has higher dielectric constant and lower dielectric loss, and it exhibits good bending deformation-dielectric sensitive response.