聚苯胺功能化多壁碳纳米管/环氧树脂复合材料的热性能与电性能研究

Study on thermal and electrical property of polyaniline functionalized multi-walled carbon nanotubes/Epoxy composites

采用可溶性导电聚苯胺功能化多壁碳纳米管(PANI-MWNTs)与环氧树脂(Epoxy)溶液共混制备了PANIMWNTs/Epoxy复合材料。当PANI-MWNTs溶解分散于Epoxy溶液中时,包覆在MWNTs表面的PANI分子链溶解和溶胀把MWNTs隔开,使MWNTs均匀分散在Epoxy中。MWNTs良好地分散及MWNTs与Epoxy间的界面粘结作用,阻碍Epoxy大分子链段的运动和热分解在复合材料中的传播,复合材料的玻璃化转变温度和热稳定性显著提高。PANI-MWNTs的引入使复合材料电导率上升,当其含量为1.25wt%时,复合材料的室温电导率为9.35×10-6 S·cm-1比Epoxy提高7个数量级。

Polyaniline functionalized multi-walled carbon nanotubes（PANI-MWNTs）/Epoxy composites were pre pared by Epoxy resin solution blended with conducting and soluble PANI MWNTs. When PANI MWNTs were dissolved and dispersed in Epoxy solution, MWNTs were segregated by soluble and swelling PANI chains on the surface of MWNTs, which resulted in MWNTs homogenously dispersed in Epoxy matrix. Owing to well dispersion of MWNTs as well as inter facial adhesion between MWNTs and Epoxy,mobility of segments in Epoxy macromolecules and propagation of decomposition reactions in the composites were impeded. As a result,glass transition temperature and thermal stability of the composites were significantly improved. Incorporation of DBSA doped PANI MWNTs increased electrical conductivity of the composites. When content of PANI-MWNTs was 1. 25 wt%, electrical conductivity at room temperature of the composite reached 9.35 × 10^-6S · cm^-1 and was increased by seven orders of magnitude compared with Epoxy.