石墨烯/热塑性聚氨酯（TPU）导电复合材料的力-电行为研究

由于易制造和应用广，导电高分子复合材料(Conductive Polymer Composites，CPCs)作为一种功能材料吸引了越来越多研究者的关注，碳纳米管（CNTs）和石墨烯(graphene)，由于具有大比表面积和高导电性，是制备CPCs最适宜的导电填料。本项目以热塑性聚氨酯（TPU）弹性体做为高分子基体，石墨烯(graphene)、石墨烯/CNTs等做为导电填料，制备柔性力敏性的导电高分子复合材料（CPCs），重点研究石墨烯/TPU导电复合材料力学性能和电学性能；单轴拉伸/压缩、循环拉伸下力-电响应机理和电性能的演化行为；拉伸/压缩过程中，导电网络变形、破坏与重构行为、数理模型和数值计算理论；CNTs与石墨烯的协同效应对石墨烯/CNTs/TPU导电纳米复合材料力学性能和力-电响应行为的影响等。本研究将为制备高性能石墨烯/TPU力敏器件提供一定技术路线和理论指导。

Conductive polymer composites (CPCs) have attracted increasing amounts of attention because of their wide range of application and easy fabrication methods. Carbon nanotubes (CNTs) and graphene have been considered as one of the most suitable conductive fillers for the preparation of CPCs because of their large aspect ratio and ultra-high conductivity. In this project, flexible strain sensors will be fabricated using thermoplastic polyurethane (TPU) as polymer matrix and graphene, graphene/CNTs as conductive fillers. The study will pay more attention to mechanical-electrical behavior of graphene/ TPU CPCs, such as the senstive stimuli-response behaviors under extension, compression and cyclic loads. The mechanisms of deformation, destruction and reconstruction of the conductive network will be investigated, and the related mathematical model and numerical calculation methods will be presented. Synergistic effect of CNTs and graphene on Mechanical-electrical behavior of graphene/CNTs/TPU CPCs will be observed. This study will provides a guideline for the preparation of high-performance CPCs strain sensors.