摘要
在硅橡胶基体中添加碳系导电填料(CB、CNT),利用超临界CO2发泡技术,制备了CB/硅橡胶、CNT/硅橡胶以及CB/CNT/硅橡胶复合导电泡沫材料,研究了混料胶料的流变行为以及发泡前后复合材料电导率、电磁屏蔽效能的变化规律。结果表明,CB与CNT均会阻碍硅橡胶复合材料的初始交联,导电填料含量越多交联越迟缓。CB/CNT/硅橡胶复配体系中更容易形成导电通路,当CB/CNT(1∶1)总含量为8%(质量分数)时,硅橡胶复合材料的电导率可达10^-5 S/cm,其电磁屏蔽效能(EI)为14~26 dB。发泡后,硅橡胶复合材料的电导率及EI值均有所下降。
Carbon-based conductive fillers(CB,CNT)were added to the silicone rubber matrix,and CB/silicone rubber,CNT/silicone rubber and CB/CNT/silicone rubber foams were prepared by supercritical CO2 foaming technology.The rheological behavior of the compound and the electrical conductivity and electromagnetic shielding effectiveness of the composite materials were studied.The results show that both CB and CNT could hinder the initial crosslinking of the silicone rubber composite.The conductive path was easier to form in the CB/CNT/silicone rubber compound system.When the total content of CB/CNT(1∶1)was 8 wt%,the conductivity of the silicone rubber composite could reach 10^-5 S/cm.The electromagnetic shielding effectiveness(EI)was 14~26 dB.After foaming,both of the electrical conductivity and the EI value of the silicone rubber composites decreased.
作者
贾亚兰
张文焕
刘涛
罗世凯
JIA Yalan;ZHANG Wenhuan;LIU Tao;LUO Shikai(Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China;School of Materials Science and Engineering, Southwest University of Science and Technology,Mianyang 621010, China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第3期3056-3065,共10页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51773186,51503189)
关键词
超临界发泡
硅橡胶泡沫
导电性能
电磁屏蔽
supercritical foaming
silicone rubber foam
electrical conductivity
electromagnetic shielding
