摘要
为研究石墨烯和不同预氧化条件对碳纳米纤维结构的影响,采用静电纺丝法制备了聚丙烯腈(PAN)/石墨烯纳米纤维,然后通过预氧化和炭化处理获得碳纳米纤维。借助傅里叶红外变换光谱仪、X射线衍射仪、差示扫描量热仪、激光显微拉曼光谱仪和扫描电子显微镜研究预氧化丝和碳纳米纤维的结构变化。结果表明:预氧化处理过程中,PAN分子发生脱氢、环化和氧化反应,最终形成稳定的梯形结构;随着预氧化温度的升高,PAN纤维的相对环化率、芳构化指数和环化度逐渐提高;石墨烯的加入提高了碳纳米纤维的石墨化程度,对脱氢、环化反应有一定的抑制作用,从而降低碳纳米纤维的断裂程度;当预氧化温度为260℃时,新的纤维结构已基本形成。
In order to study the effect of graphene addition and different preoxidation conditions on the structure of pre-oxidized fibers and carbon nanofibers,polyacrylonitrile(PAN)nanofibers were prepared by electrospinning.And then carbon nanofibers were obtained by preoxidation and carbonization.Finally,the structural change of pre-oxidized fibers and carbon nanofibers were characterized by Fourier transform infrared spectroscopy,X-ray diffraction,differential scanning calorimetry,Raman spectrometer and scanning electron microscopy.The results show that a stable trapezoidal structure is formed by the dehydrogenation,cyclization and oxidization reactions of PAN molecules during the preoxidation process.The relative cyclization rate,aromatization index and degree of cyclization of PAN fibers gradually increase with the rise of preoxidation temperature.The addition of graphene improves the graphitization degree of carbon nanofibers and has a certain inhibition effect on the dehydrogenation and cyclization reaction.Therefore,the fracture degree of carbon nanofibers reduces.When the preoxidation temperature is 260℃,a new structure of the fibers is substantially formed.
作者
田银彩
张浩鹏
李博琛
康广杰
李根宇
TIAN Yincai;ZHANG Haopeng;LI Bochen;KANG Guangjie;LI Genyu(Department of Material and Chemical Engineering,Henan Institute of Engineering,Zhengzhou,Henan 450007,China)
出处
《纺织学报》
EI
CAS
CSCD
北大核心
2018年第10期24-31,共8页
Journal of Textile Research
基金
"纺织新产品开发"河南省工程实验室2016年度开放基金项目(GCSYS201610)
关键词
聚丙烯腈
石墨烯
静电纺丝
预氧化处理
炭化处理
polyacrylonitrile
graphene
electrospinning
preoxidation treatment
carbonization
