摘要
为提高有机硅复合材料的导热性能和力学性能,防止碳纳米管团聚,改善其与聚合物的混容性,通过一种向列型液晶N-(4-甲氧基亚苄基)对丁基苯胺(N-(4'-methoxybenzylidene)-4-butylaniline,MBBA)分子功能化改性多壁碳纳米管(multi-walled carbon nanotubes,MWCNTs),制备了MBBA-MWCNTs有机硅纳米复合材料.测试结果表明,MBBA液晶与碳纳米管之间通过非共价键(π-π堆积)相互结合,不仅提高了碳纳米管在有机硅复合材料中的分散性,而且保证了MBBA功能化碳纳米管与有机硅良好的混容性,从而更好地发挥了碳纳米管优异的热学性能和力学性能.当MWCNTs质量分数为1.0%时,MBBAMWCNTs有机硅复合材料的拉伸强度达到6.78 MPa,比相同质量分数的MWCNTs有机硅复合材料提高了36%,比纯有机硅材料的提高了500%.当MWCNTs质量分数为14.0%时,MBBA-MWCNTs有机硅复合材料的导热系数达到0.561 5 W/(m·K),比MWCNTs有机硅材料的导热系数高54%,约是纯的有机硅材料导热系数的4倍.
This study aims to improve the thermal conductivity and mechanical properties of organic silicone composites,prevent the agglomeration of carbon nanotubes,and improve their compatibility with polymers. The MBBA-MWCNTs-silicone nanocomposites are prepared via a nematic liquid crystal N-（4＇-methoxybenzylidene）-4-butylaniline（MBBA） molecularly modified multi-walled carbon nanotubes（MWCNTs）. The results show that MBBA interacts with MWCNTs via a non-covalent π-π interaction,which not only improves the dispersion of MWCNTs in silicone resin but also guarantees the good compatibility between MWCNTs and the silicone resin matrix. While the mass fraction of MWCNTs is 1.0%,the tensile strength of MBBA-MWCNTs-organic siliconenanocomposites are increased to be 6. 78 MPa,which are enhanced by 500% and 36%,respectively,compared to those of organic silicone and MWCNTs-organic silicone nanocomposites. The thermal conductivity of the silicone resin filled with the MBBA-MWCNTs reaches 0. 561 5 W/（ m·K） at the mass fraction of 14. 0%,which is as about 4 times as that of neat silicone material and 54% over that of MWCNTs-organic silicone nanocomposite with the same filler mass fraction.
作者
贵大勇
刘灿群
宗阳阳
郑进宝
喻思
颜晓梅
王明良
GUI Dayong;LIU Canqun;ZONG Yangyang;ZHENG Jinbao;YU Si;YAN Xiaomei;and WANG Mingliang(College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen 518060, Guangdong Province, P. R. China)
出处
《深圳大学学报（理工版）》
EI
CAS
CSCD
北大核心
2018年第3期278-284,共7页
Journal of Shenzhen University(Science and Engineering)
基金
广东省自然科学基金资助项目(2017A030313322)~~
关键词
聚合物基复合材料
导热材料
碳纳米管
有机硅
液晶
力学性能
导热性能
polymer composites
thermal conductive materials
carbon nanotube
silicone
liquid crystal
mechanical properties
thermal conductivity
