新型炭材料2019，Vol.34Issue(1)：20-29,10.
交联稳定化对聚酰亚胺基石墨纤维结构和性能的影响
Effect of crosslinking method on the microstructures and properties of polyimide﹣based graphite fibers
摘要
Abstract
Different polyimide (PI) fibers with and without carboxyl groups on the polymer chain were prepared by dry﹣jet wet spinning using 1,2,4,5﹣benzene tetracarboxylic dianhydride (PMDA), p﹣phenylenediamine (p﹣PDA) and 3,5﹣diaminobenzoic acid (DABA) as the PI monomers with a PMDA/(DABA+p﹣PDA) mass ratio of 1. 02 :1 and different DABA/p﹣PDA mass ratios. The PI fibers were chemically crosslinked with 1,4﹣butanediol to improve their thermal stability. The PI fibers before and after chemical crosslinking were carbonized at 1400℃ for 1 h and graphitized at 2800℃ for 1 h to prepare graphite fibers. Results indicate that the crosslinking by hydrogen bonding between carboxyl groups significantly increased the thermal stability and increased the carboniza﹣tion and graphitization yields of the PI fibers. The graphitization degree and thermal conductivity of the graphite fibers from the PI with carboxyl groups are higher than those from the corresponding chemically crosslinked ones. The graphitization degree and ther﹣mal conductivity increase with the DABA/p﹣PDA ratio. The highest degree of graphitization (97. 9 % ) was obtained at a DABA/p﹣PDA ratio of 5 :95 while the highest thermal conductivity (245. 6 W/(m·K)) was obtained at a DABA/p﹣PDA ratio of 10 :90.关键词
交联稳定化/ PI纤维/石墨纤维Key words
Crosslinking stabilization/Polyimide fiber/Graphite fiber分类
通用工业技术引用本文复制引用
肖萌,徐红玉,马兆昆,宋怀河..交联稳定化对聚酰亚胺基石墨纤维结构和性能的影响[J].新型炭材料,2019,34(1):20-29,10.基金项目
先进功能复合材料技术重点实验室基金. （）
