柔性高分子基应变传感复合材料内部导电通路精确构筑与应变传感性能研究

将导电纳米粒子与柔性高分子复合制备得到柔性导电复合材料，材料在外力作用下发生形变，内部导电通路结构随之改变，导致材料输出的电阻信号做出相应响应，因此可用作柔性应变传感材料，在运动监测、健康监测、电子皮肤等新兴领域具有重要应用前景。然而，由于目前柔性高分子基应变传感材料内部导电通路杂乱无章，传感过程中导电粒子形成的导电通路演变及恢复不能完全可控及可重复，其应变传感稳定性、重复性、可控性较差，严重制约了这类材料走向实际应用。针对这一瓶颈问题，本项目拟从内部微观导电通路设计入手，发展3D微纳打印法与模板转印法精确构筑柔性高分子基应变传感材料内部微观导电通路结构，实现传感过程中导电通路的演变及恢复的可控与可重复，系统研究微观导电通路结构-应变传感性能之间的构效关系，明确传感机制，遴选最优导电通路结构，为制备高灵敏、高稳定性及良好重复性的柔性高分子基应变传感材料提供新的方法与思路。

Incorporating electrically conductive nanoparticles into flexible polymer can fabricate the flexible conductive polymer composites (FCPCs). Under strain, the deformation of FCPCs will cause the change of the conductive pathway inside the flexible polymer matrix, thus causing the change of resistance of the composites. Therefore, FCPCs can be used as the strain sensors in human motion monitoring, health monitoring, and e-skins. However, it is found that the destroy and recovery of conductive pathway are not controllable and repeatable during the strain sensing process because of the disorder conductive pathway formed by the conductive nanoparticles inside polymer matrix. As a result, FCPCs-based strain sensors exhibit poor stability and repeatability, which limit their practical applications. In this project, we plan to develop the 3D printing method and nanotransfer printing method to precisely construct the microscopic conductive pathway inside the flexible polymer matrix, which fabricate the FCPCs-based strain sensors with good stability and repeatability. Moreover, we plan to systematically investigate the relationship between the strain sensing properties of FCPCs-based strain sensors and the designed conductive pathways inside the flexible polymer matrix to find the optimal structure of conductive pathway and reveal the sensing mechanisms of each types of strain sensors. Finally, the results of this project can provide new idea and route to design high-performance FCPCs-based strain sensors.