通过原位分散方法将不同含量的多壁碳纳米管(MWNTs)引入聚对苯撑苯并二嗯唑(PBo)聚合体系,共混产物采用液晶纺丝法纺制成高性能MWNTs/PBO纤维.用偏光显微镜观察了MWNTs的分散状况,发现将MWNTs先预分散在多聚磷酸(PPA)中再添加可以有效地改善其分散性,热失重分析仪、强力仪研究了纤维的热稳定性能和力学性能.结果表明,MWNTs质量分数为2%的共混纤维的拉伸强度和模量分别达到4.69 GPa和128.8 GPa,比相同卷绕速度下PBO纤维提高了24.2%和23.5%,起始热分解温度也从668.9℃提高到700.8℃.MWNTs的质量分数达到5%时由于团聚严重,降低了PBO的可纺性,影响了纤维的性能.
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