Ti_(3)C_(2)T_(x)/聚酰亚胺复合气凝胶的制备及其压阻传感性能研究

Preparation of Ti_(3)C_(2)T_(x)/Polyimide Composite Aerogel and Its Piezoresistive Sensing Properties

将Ti_(3)C_(2)T_(x)(MXene)片层引入聚酰亚胺(PI)前驱体中,经过物理共混、冷冻干燥和热环化过程,制备得到不同配比的MXene/PI复合气凝胶。分析了气凝胶的形貌结构,并详细研究了不同配比复合气凝胶的压阻传感性能。结果表明,MXene与PI两种材料在气凝胶内部相容性良好,随着MXene的引入,MXene/PI气凝胶产生了紧密且有序的三维多孔结构,为结构内部提供了一定的力学支撑,提升了气凝胶的力学柔韧性与回弹性。同时MXene/PI在10%~60%应变范围内有较宽的传感范围(0%~65.57%),在低压区(0~15 kPa)下灵敏度为0.03 kPa^(-1),在高压区(15~40 kPa)下灵敏度为0.007 kPa^(-1),且传感曲线的峰值变化基本与压缩应变的变化同步,线性度高达99.7%,并且在长时间的多循环测试下显示出了良好的耐疲劳性和传感稳定性。

Ti_(3)C_(2)T_(x)(MXene)lamellar was introduced into polyimide(PI)precursor,and MXene/PI composite aerogel with different proportions was prepared through physical blending,freeze drying and thermal cyclization.The morphology and piezoresistive sensing performance of aerogel were investigated,and the composite aerogels with different ratio were compared.The results showed that MXene and PI had good compatibility in the aerogel.With the introduction of MXene,MXene/PI aerogel produced a tight and ordered three-dimensional porous structure,which provided certain mechanical support for the interior and improved the mechanical flexibility and resilience of the aerogel.Meanwhile,MXene/PI has a wide sensing range(0%~65.57%)in the strain range of 10%~60%,with a sensitivity of 0.03 kPa^(-1) in the low pressure region(0~15 kPa)and 0.007 kPa^(-1) in the high pressure region(15~40 kPa).Moreover,the peak value of the sensing curve is basically synchronized with the change of the compression strain,and the linearity is as high as 99.7%.Furthermore,it shows good fatigue resistance and sensor stability under the longtime multi-cycle test.