摘要
利用Fenton试剂处理多壁碳纳米管(MWNTs),采用原位复合法制备多壁碳纳米管/氰酸酯(M/B)与羟基化改性的多壁碳纳米管/氰酸酯(M—OH/B)复合材料。研究结果表明,Fenton试剂处理能在MWNTs表面接枝羟基(—OH);MWNTs的加入导致材料的Tg降低,耐热性下降;而MWNTs—OH的加入,使得材料的Tg基本保持不变,且热稳定性显著提高。复合材料的介电常数随多壁碳纳米管的含量增加而迅速增加,但当多壁碳纳米管的含量到达一定程度后介电常数反而下降。M—OH/B复合材料发生渗流效应时的渗流阈值大于M/B复合材料的相应值;发生渗流效应时,复合材料的介电常数和介电损耗都随实验频率增加迅速降低。
Multi-walled carbon nanotubes（MWNTs） was treated with Fenton s reagents,and composites based on cyanate ester（BADCy） and MWNTs or treated MWNTs were developed,coded as M/B and Results show that hydroxyl groups（—OH） are grafted on the surface of MWNTs.The addition of MWNTs into BADCy resin decreases the glass transition temperature（Tg） and thermal stability,while the incorporation of MWNTs—OH does not decline Tg and significantly improve the thermal stability of BADCy resin.Dielectric constant of both kinds of composites initially increases with the increase of MWNTs or MWNTs---OH content, and reaches the maximum value at some MWNTs or MWNTs--OH content. After that dielectric constant of both kinds of composites decreases with continuous increase of MWNTs or MWNTs--OH content. Comparing to M/B, the percolation threshold of M--OH/B is larger. In addition, when percolation oecurres, dielectric constant and dielectric loss of both kinds of composites decrease quickly with the increase of the test frequency, respectively.
出处
《武汉理工大学学报》
CAS
CSCD
北大核心
2009年第21期28-32,共5页
Journal of Wuhan University of Technology
基金
国家自然科学基金(50773048)
江苏省2008年"333工程"科研项目
关键词
碳纳米管
氰酸酯
热性能
介电性能
multi-walled carbon nanotubes
cyanate ester
thermal stability
dielectric properties
