导电炭黑/杜仲胶复合材料电磁屏蔽性能的研究

采用机械共混法制备了导电炭黑/杜仲胶复合材料,研究炭黑用量对复合材料电性能和电磁屏蔽性能的影响。结果表明：随着炭黑用量的增加,复合材料的导电率增大,当炭黑用量为25份时,导电率达到3.3S/cm,导电率遵循导电逾渗规律；复合材料的Payne效应越来越大,有利于形成稳定的导电网络；复合材料的拉伸强度逐渐增大后略微降低,断裂伸长率先增加后逐渐下降。复合材料的屏蔽效能增大,当炭黑用量为20份时,屏蔽效能最高能达到33.2dB,可以满足一般工业或者商业用电子设备的要求。

Study on Electromagnetic Properties of Conductive Carbon Black/ Eucommia Ulmoides Gum Composites

Conductive carbon black/eucommia ulmoides gum(CCB/EUG) composites were prepared by mechanical blending. The effects of CCB contents on the electrical conductivity and electromagnetic shielding properties of CCB/EUG composites were investigated. The results showed that the electrical conductivity of CCB/EUG composites was increased with the increasing of CCB content, and reached 3.3S/cm when 25phr CCB was loaded. The electrical conductivity well agrees with the conductivity percolation behavior. The Payne effect of CCB/EUG composites was larger and larger with the increasing CCB content, which leaded to forming a complete conductivity network. The tensile strength and elongation at break increased at first and then decreased slightly with the increasing CCB content. The electromagnetic interference shielding effectiveness of CCB/EUG composites was increased with the increasing of CCB content, and reached 33.2dB when 20phr CCB was loaded, which could meet the requirements of electronic equipments for the common industry and business.