石墨烯/聚酰亚胺复合石墨纤维的结构与性能

Structures and Performance of Graphene/Polyimide Composite Graphite Fibers

采用干湿法纺丝工艺制备氧化石墨烯/聚酰亚胺复合纤维,然后将复合纤维进行炭化和石墨化处理得到石墨烯/聚酰亚胺复合碳纤维及石墨纤维。对复合碳纤维进行热重分析、Raman、力学性能、传导性能、形貌等测试分析。结果表明,氧化石墨烯添加量为0.3%(质量分数,下同)的复合纤维的耐热性能最佳;氧化石墨烯的加入,使石墨烯/聚酰亚胺复合碳纤维的力学性能和传导性能明显提高,石墨化程度增加。当复合碳纤维2800℃石墨化后,氧化石墨烯含量增加到2.0%时,复合石墨纤维的热导率达到435.57 W·m-1·K-1,结构更加致密。

Dry-wet spinning process was used to gain graphene oxide/polyimide composite fibers,then graphene/polyimide composite carbon and graphite fibers were obtained through carbonized and graphitized.Different graphene oxide contents of the composite carbon and graphite fibers were measured by thermal gravimetric analysis,Raman,mechanical properties,electrical properties,SEM and so on.The results show that when the GO content is 0.3%（mass fraction,the same below）,the thermal property of the graphene oxide/polyimide composite fibers is the best.The mechanical and electrical properties are obriously improved by the addition of GO,graphitization degree also increases.When the composite carbon fibers are treated at 2800℃,GO content increases to 2.0%,the thermal conductivity of the composite graphite fibers reaches 435.57W·m^-1·K^-1and cross-section structures of carbon fibers are more compact.