摘要
采用熔融复合法制备并研究了聚己二酰间苯二甲胺/多壁碳纳米管(MXD6/MWCNT)复合材料的导电性能。结果表明,MXD6和MWCNT之间的相容性较差,体系中大部分MWCNT倾向于处于团聚状态,使MWCNT构建导电网络的效率大大降低;而添加有机蒙脱土(OMMT)可显著提高复合材料的导电性能,如在MWCNT含量为2份(质量份,下同)的体系中,添加OMMT可使体系的体积电阻率急剧降低7个数量级;OMMT的作用机制在于其在材料混炼过程中,使MWCNT不断分散并承载于更新的OMMT粒子表面上,形成空间上具有高次结构的结构形态,因而极大地改善了导电网络的构筑效率。
Poly（m-xylene adipamide） （MXD6）/multiwalled carbon nanotube （MWCNT） / organo- montmorillonite （OMMT） composites were prepared via melt mixing in a rotational rheometer. The effects of OMMT on the electrical conductivities of the composites were investigated. It was revealed that the poor miscibility between MXD6 and MWCNT led to a strong tendency of aggregation of MWCNTs, therefore sharply decreased the efficiency of the construction of conductive network. Although OMMT was electrically inert, the presence of OMMT could significantly increase the conductivities of the composites. The X-ray diffraction and Molau data revealed that the majority of OMMT was distributed in the MXD6 matrix in the state of intercalation. The morphology of the composites was observed by field emission scanning electron microscopy, showing that MWCNTs adhere to the new surface of OMMT particles during melt mixing, forming a structure with higher dimensions. As a result, the dispersion of MWCNTs in the MXD6 matrix was greatly increased, and led to improved conductivity. Therefore, OMMT- filled MXD6/MWCNT was a promising material with good electrical conductivity
出处
《中国塑料》
CAS
CSCD
北大核心
2012年第12期19-24,共6页
China Plastics
基金
国家自然科学基金(50973053)
高等学校博士学科点专项科研基金(20090002110072)
