CAJ | 학술논문

均苯四甲酸二酐和二氨基二苯醚溶解在N,N-二甲基乙酰胺中,室温下聚合为聚酰胺酸。以聚酰胺酸溶液作为前驱体,在20 kV电压下静电纺丝,然后进行350℃热亚胺化处理可得到定向排列的聚酰亚胺纳米纤维,再于900℃炭化、3000℃石墨化,得到均匀连续、定向排列的聚酰亚胺基炭纳米纤维,纤维直径约100 nm。结果表明,聚酰胺酸质量分数为20%的溶液电纺性能最佳,3000℃石墨化处理后的炭纳米纤维具有典型的石墨结构。
균분사갑산이항화이안기이분미용해재N,N-이갑기을선알중,실온하취합위취선알산。이취선알산용액작위전구체,재20 kV전압하정전방사,연후진행350℃열아알화처리가득도정향배렬적취선아알납미섬유,재우900℃탄화、3000℃석묵화,득도균균련속、정향배렬적취선아알기탄납미섬유,섬유직경약100 nm。결과표명,취선알산질량분수위20%적용액전방성능최가,3000℃석묵화처리후적탄납미섬유구유전형적석묵결구。
Polyimide ( PI) is a good carbon precursor owing to its high carbon yield and easy graphitization. PI nanofibers pre-pared by electrospinning were carbonized and graphitized to prepare aligned carbon nanofibers. Pyromelliticdianhydride and 4,4'-di-aminodiphenyl ether were dissolved in N,N-dimethylacetamide at room temperature and stirred for 2 h to obtain a polyamide acid ( PAA) solution, which was electrospun into aligned PAA nanofibers at 20 kV and collected by a rolling cylinder 18 cm below the needle with a rolling speed of 2 800 r/min. The PAA nanofibers were first imidized into the PI nanofibers at 350 ℃, then carbon-ized at 900 ℃ at a heating rate of 5 ℃/min and finally graphitized at 3 000 ℃ to obtain continuous and aligned polyimide-based carbon nanofibers. The PAA solution with a concentration of 20% was the most suitable for electrospinning. SEM characterization shows that the average diameter of the carbon nanofibers is around 100 nm. The carbon nanofibers after graphitization at 3 000 ℃have a typical graphite structure.