碳纳米管改性环氧树脂的导热和阻燃性能

以双酚A二缩水甘油醚(DGEBA)环氧树脂(Epoxy Resin,EP)为基体、甲基六氢苯酐(MHHPA)为固化剂、以多壁碳纳米管(MWCNTs)为添加剂制备了环氧树脂/碳纳米管纳米复合材料。通过对微观结构、玻璃化转变温度(Tg)、热失重、热导率和锥形量热测试结果分析,研究了质量分数少于1.5%的MWCNTs对环氧树脂的导热和阻燃性能影响,结果表明,MWCNTs质量分数为1.5%时,复合材料发生团聚;纳米复合材料随着MWCNTs质量分数的增加Tg值先增加后降低;失重5%时,对应的温度先增加后降低,残炭量增加;样品的热导率呈现先升高后降低的趋势,当MWCNTs质量分数为1%时,复合材料的热导率最大;MWCNTs加入后环氧树脂的总释热量减少,释烟量增加,阻燃性得到一定程度的提高。

Thermal Conductivity and Flame Retardancy of Carbon Nanotube Modified Epoxy Resin

Epoxy resin(EP) nanocomposites have been regarded as high performance materials with the advantages of organic polymers, inorganic materials and nanoparticles. Herein, DGEBA/MWCNTs nanocomposites were prepared based on diglycidyl ether of bisphenol-A(DGEBA),methylhexahydrophthalic anhydride(MHHPA) as curing agent, and multi-walled carbon nanotubes(MWCNTs) as additive.The effect of MWCNTs(mass fraction less than 1.5%) on thermal and flame retardancy of DGEBA epoxy resin was explored by DGEBA/MWCNTs nanocomposites structure, thermal properties, thermal conductivity and cone calorimeter analysis. MWCNTs formed cluster when their mass fraction is 1.5%. With increasing the content of MWCNTs, the glass transition temperature(T_g) and the temperature at which 5% mass loss of the composites increase initially and then decrease, at the same time the residual carbon content increases. Thermal conductivity of the composite exhibits a trend of rising initially and then decreasing afterwards. The maximal thermal conductivity appears when the mass fraction of MWCNTs reaches 1%. The total heat release volume of these composites decreases and the total volume of smoke release increases compared to those of epoxy resin. Cone calorimeter tests show that the incorporation of MWCNTs into epoxy thermosets can improve its flame retardancy to some extent.