摘要
采用三元乙丙橡胶(EPDM)对聚丙烯(PP)进行共混改性,并对所得共混物进行超临界二氧化碳(Sc-CO_(2))发泡,分别以该共混物和所得发泡样品为介电层组装得到不同的PP基电容式压力传感器。对该共混物和发泡样品的微观结构和力学性能进行表征,基于此分析研究了EPDM和发泡对PP基介电层形变能力进而对相应传感器灵敏度(S)和压强响应范围的影响及其机理。结果表明:EPDM的加入及其含量的提高显著增强了PP基介电层的形变能力,使得该介电层屈服点应力值和大形变区间内的模量均显著降低。Sc-CO_(2)发泡进一步增强了该介电层的形变能力,使得其在较低应力范围内的模量显著降低,且屈服点消失。最终,以质量分数30%EPDM共混物发泡样品为介电层的电容式压力传感器展现出较好的压强-电容响应性能:压强响应范围和S从PP的25~40 MPa和0.0271 MPa^(-1)分别拓宽和增加至该传感器的0~40 MPa和0.1207 MPa^(-1)。应用测试结果表明,该传感器在面部肌肉运动和手腕弯曲等人体运动检测中表现出良好的应用前景。
Ethylene propylene diene monomer rubber(EPDM)is adopted to modify PP,and the prepared blends are foamed with supercritical carbon dioxide(Sc-CO_(2)).By using the blends and the foamed sample as dielectric layers,different PP-based capacitive pressure sensors are assembled.The microstructure and mechanical properties of the blends and their foamed samples are characterized.Based on this,the influence of the EPDM and foaming on the deformation ability of the PP-base dielectric layers,and thus on sensitivity(S)and pressure response range of the corresponding sensor are studied.The results show that the addition of EPDM and its increase significantly enhance the deformation ability of the PP-based dielectric layer:the stress value at yield point and the modulus in large deformation interval are significantly reduced.The Sc-CO_(2)foaming further enhances the deformation ability of the PP-based dielectric layer:its modulus in the lower stress range significantly reduces,and the yield point disappears.As a result,the capacitive pressure sensor with the foam sample as the dielectric layer shows better pressure response performance:the pressure response range and S are widened and increased from 25~40 MPa and 0.0271 MPa^(-1)of the sensor with PP to 0~40 MPa and 0.1207 MPa^(-1)of the sensor with foamed blend sample with 30%(weight)EPDM,respectively.The application test results show that the prepared PP-based sensor can be well applied in human motion detection such as facial muscle motion and wrist bending.
作者
曾鹏程
肖书平
杨柳
谈灵操
徐百平
Zeng Pengcheng;Xiao Shuping;Yang Liu;Tan Lingcao;Xu Baiping(School of Mechanical and Automation Engineering,Wuyi University,Jiangmen,Guangdong 529020,China;Jiangmen Key Laboratory of Polymer Intelligent Manufacturing,Wuyi University,Jiangmen,Guangdong 529020,China)
出处
《机电工程技术》
2025年第3期58-63,共6页
Mechanical & Electrical Engineering Technology
基金
国家自然科学基金资助项目(11972023,12102306)
广东省教育厅重点项目(2020ZDZX2051)。
关键词
电容式压力传感器
压强响应范围
灵敏度
聚丙烯
超临界二氧化碳发泡
capacitive pressure sensor
pressure response range
sensitivity
polypropylene
supercritical carbon dioxide foaming
