MWCNT-CB/PDMS复合电极介电弹性体驱动器的制备与性能优化

介电弹性体驱动器(DEA)的柔性电极发挥着产生电场和约束介电母体形变的重要作用。本文以一维的多壁碳纳米管(MWCNT)和零维的导电炭黑(CB)为共同导电填料，设计浇注了一系列不同尺寸、不同力学、电学性能的聚二甲基硅氧烷(PDMS)复合电极膜(MWCNT-CB/PDMS)。将电极膜黏附在聚氯乙烯凝胶膜的两侧表面，导入脉冲高压电信号，获得一系列电驱动行为变化的新型介电聚合物驱动器。驱动性能测试结果表明：电极覆盖率的增加有利于DEA位移输出；电极厚度的增加限制了DEA的位移输出；随着MWCNT掺杂量的增加，位移输出先增后减。正交实验结果表明：MWCNT掺杂量对DEA的驱动位移有显著的影响，电极覆盖率和厚度有高度显著的影响；最优组合下，驱动器的最大位移输出为1.71 mm。

Fabrication and optimization of dielectric elastomer actuator using MWCNT-CB/PDMS composite electrodes

Flexible electrode of dielectric elastomer actuator (DEA) plays important roles in generating electric fields and constraining dielectric matrix deformation. By using one-dimensional multi-wall carbon nanotubes (MWCNT) and zero-dimensional conductive carbon black (CB) as co-conductive fillers, a series of polydimethyl siloxane (PDMS) composite electrode films (MWCNT-CB/PDMS) were designed with varying size, mechanical and electrical properties. The electrode films were adhered to the lateral surfaces of a polyvinyl chloride gel matrix film and imported into a pulsed high-voltage signal to obtain novel dielectric polymer actuators with various electromechanical behaviors. Tests of electromechanical properties reveal that, the increase of electrode coverage is beneficial to DEA’s strain, the increase of electrode thickness hampers its strain, while the strain exhibits an initial increase following decrease trend with increasing MWCNT loading. Orthogonal experiments show that, the MWCNT loading has a significant effect on the displacement output, while the electrode coverage and thickness present high-level significances to the displacement output. Under the optimal condition, the displacement output of DEA is 1.71 mm at maximum.