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- 2015
炭黑/聚丙烯-聚(苯乙烯-乙烯/丁烯-苯乙烯)复合材料的介电性能和压阻性能
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Abstract:
为了制备柔性较好的聚合物基压阻材料, 利用熔融共混法制备了炭黑/聚丙烯-聚(苯乙烯-乙烯/丁烯-苯乙烯) (CB/PP-SEBS)复合材料, 并研究了CB含量对CB/PP-SEBS复合材料介电性能和压阻性能的影响。结果表明:随着CB含量的增加, CB/PP-SEBS复合材料的介电常数、介电损耗及电导率均提高; CB/PP-SEBS复合材料发生导电逾渗时, CB的含量为12.2wt%; 在CB/PP-SEBS复合材料发生弹性形变时, 由于外力破坏了CB的导电网络, 复合材料的电阻随着应变的增大而增大; 循环压阻测试结果显示, 在弹性变形区CB/PP-SEBS复合材料的电阻随着应变呈现周期性变化。研究结果可为制备具有稳定电阻变化的聚合物基压阻材料提供借鉴。 In order to prepare polymer piezoresistive materials with good flexibility, carbon black/polypropylene-poly(styrene-ethylene/butylene-styrene) (CB/PP-SEBS) composites were fabricated through melt blending method. The effects of CB content on the dielectric properties and piezoresistive properties of CB/PP-SEBS composites were investigated. The results indicate that the dielectric constant, dielectric loss and electrical conductivity of CB/PP-SEBS composites are all enhanced with the increasing of CB content. The electrical conductivity percolation of CB/PP-SEBS composites occurs when the CB content is 12.2wt%. Owing to the external force destruction of conductive network of CB, the electrical resistivity of CB/PP-SEBS composites increases with the strain increasing during the elastic deformation process of CB/PP-SEBS composites. The periodic piezoresistive measurement results indicate that the electrical resistivity of CB/PP-SEBS composites varies periodically with strain in the elastic deformation region. The results could give some experience for the preparation of polymer piezoresistive materials with stable resistance variation. 北京市教育委员会科技计划面上项目(KM2015100120095)
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