乙基纤维素电纺纤维调控PDMS/CNT柔性复合材料性能的研究

Properties of PDMS/CNT flexible composite materials improved with ethyl cellulose electrospinning fiber

研究了乙基纤维素(EC)电纺纤维调控PDMS/CNT柔性复合材料的力学和电学性能.结果表明,引入电纺EC纤维后,PDMS/CNT柔性复合材料的拉伸强度从1.73 MPa提高至3.97 MPa,断裂应变由86.56%提高到115.00%,韧性由0.61 MJ·m^(-3)提高到1.58 MJ·m^(-3);有缺口PDMS/CNT柔性复合材料的拉伸强度从0.34 MPa提高至1.57 MPa,断裂应变由18.85%提高到27.54%,韧性由0.04 MJ·m^(-3)提高到0.27 MJ·m^(-3);导电电阻由550 kΩ下降至228 kΩ,导电性上升.基于EC电纺纤维调控的PDMS/CNT复合材料组装的应力传感器灵敏度和循环稳定性获得了有效提升,引入1 wt%EC电纺纤维后,柔性应力传感器的灵敏度从0.341 kPa^(-1)提高至4.922 kPa^(-1),提升了14倍,引入电纺EC纤维后的传感器循环电阻变化率曲线变得相对更加规整,异常波动更小.

In this paper,the mechanical and electrical properties of PDMS/CNT flexible composites controlled by ethyl cellulose(EC)electrospun fiber were studied.The results showed that after the introduction of electrospun EC fibers,the tensile strength of PDMS/CNT flexible composite materials increased from 1.73 MPa to 3.97 MPa,the fracture strain increased from 86.56%to 115.00%,and the toughness increased from 0.61 MJ·m^(-3)to 1.58 MJ·m^(-3);The tensile strength of the notched PDMS/CNT flexible composite material increased from 0.34 MPa to 1.57 MPa,the fracture strain increased from 18.85%to 40.12%,and the toughness increased from 0.04 MJ·m^(-3)to 0.27 MJ·m^(-3);The conductive resistance decreased from 550 kΩ to 228 kΩ,and the conductivity increased.The stress sensor sensitivity and cyclic stability of PDMS/CNT composite material assembly based on EC electrospun fiber regulation have been effectively improved.After introducing 1 wt%EC electrospun fiber,the sensitivity of the flexible stress sensor has been increased from 0.341 kPa^(-1)to 4.922 kPa^(-1),a 14 fold increase,after the introduction of electrospun EC fibers,the cyclic resistance change rate curve of the sensor becomes relatively more regular,with less abnormal fluctuations.