Polyimide/graphene (PI/G) composite fibers containing p-phenylenediamine (p-PDA), 3,3′,4,4′-Biphenyl tetracarboxylic diandhydride (BPDA) and graphene (G) were prepared by wet spinning and thermal imidization. The mechanical properties, thermal stability, orientation factor and morphology of PI/G composite fibers were characterized and studied. Within the scope of the study, the tensile strength and tensile modulus of the fibers increased first and then decreased with the increase of the graphene content. Moreover, the glass transition temperature and thermal decomposition temperature of the PI/G composite fibers increased with the increased of the graphene content. X-ray diffraction (XRD) showed that the degree of orientation of the of prepared fibers increase firstly and then decrease with the content of graphene increasing. SEM indicated that graphene was dispersed evenly in the PI/G composite fibers and graphene had satisfactory compatibility with PI matrix.

含对苯二胺的聚酰亚胺/石墨烯（PI / G）复合纤维（p-PDA），3,3'，4,4'-联苯四甲酸二酐（BPDA）和石墨烯（G）通过湿法纺丝和热酰亚胺化制备。对PI / G复合纤维的力学性能，热稳定性，取向因子和形貌进行了表征和研究。在研究范围内，随着石墨烯含量的增加，纤维的拉伸强度和拉伸模量先增加，然后降低。而且，PI / G复合纤维的玻璃化转变温度和热分解温度随着石墨烯含量的增加而增加。X射线衍射（XRD）表明，随着石墨烯含量的增加，所制备纤维的取向度先升高后降低。