论文部分内容阅读
石油沥青在氮气氛中420℃热缩聚7h,制得软化点为295℃的炭纤维前驱体沥青。此前驱体沥青在单孔纺丝器中熔纺获得沥青纤维。将沥青纤维于空气中320℃稳定化处理,最后在氮气流中1000℃炭化制成炭纤维。应用SEM、TGA、FTIR和XRD对石油沥青、前驱体沥青、沥青纤维、预氧化纤维和炭纤维分别进行表征。发现:前驱体沥青中含有质量分数70.5%中间相组分,炭纤维具有径核结构,其最大抗拉强度为650MPa.
The petroleum pitch was thermally shrink-polymerized at 420 ℃ for 7h in a nitrogen atmosphere to prepare a carbon fiber precursor pitch with a softening point of 295 ° C. The precursor bitumen was melt-spun in a single-hole spinner to obtain pitch fibers. The asphalt fiber in the air at 320 ℃ for stabilization, and finally in a stream of carbon at 1000 ℃ charcoal carbon fiber. The petroleum pitch, precursor bitumen, pitch fiber, preoxidation fiber and carbon fiber were characterized by SEM, TGA, FTIR and XRD respectively. It is found that the precursor bitumen contains 70.5% mass fraction of mesophase, and the carbon fiber has a core-and-core structure with a maximum tensile strength of 650 MPa.