新型炭材料2021，Vol.36Issue(4)：827-834,8.DOI:10.1016/S1872-5805(20)60516-9
PAN预氧结构径向调控及其对炭纤维性能的影响
Regulating the radial structure of polyacrylonitrile fibers during pre-oxidation and its effect on the mechanical properties of the resulting carbon fibers
摘要
Abstract
The radial structure of polyacrylonitrile fibers oxidized before carbonization and its distribution directly affect the per-formance of the resulting carbon fibers. Optimizing the radial distribution of the oxidized structure and establishing a relationship between this structure and the mechanical properties of the final carbon fibers will help optimize the oxidation conditions for the pre-paration of high-performance carbon fibers. Solid-state nuclear magnetic resonance spectroscopy, optical microscopy, thermogravi-metric analysis, and mechanical tests were used to investigate the effect of the oxidation reaction rate on the radial distribution of the structure of the oxidized fibers and the mechanical properties of the resulting carbon fibers. The oxidation reaction rates were con-trolled by regulating the oxidation temperature gradient. Results show that the degree of oxidation increases with both the average and initial oxidation rates. By increasing the average oxidation reaction rate, the oxidized structure penetrates deeper into the core re-gion of the fibers, the content of oxygen-containing functional groups increases, the thermal stability of the fibers decreases, and the degree of graphitization of the final carbon fibers increases, but the density of the fibers is decreased and their mechanical properties are degraded. Compared with sample obtained with the lower initial oxidation rate, the number of oxygen-containing functional groups, thermal stability, degree of graphitization and density of the final carbon fibers of the sample with the higher initial oxidation rate are higher, and its tensile strength and modulus are respectively 4.2％ and 2.2％ higher. A new type of carbon fiber with high strength, medium modulus and a relatively large diameter is obtained under the optimized oxidation conditions.关键词
预氧纤维/反应速率/径向分布/预氧温度/力学性能Key words
Pre-oxidized fibre/Reaction rate/Radial distribution/Pre-oxidation temperature/Mechanical properties分类
化学化工引用本文复制引用
王云峰,王一苇,徐樑华,王宇..PAN预氧结构径向调控及其对炭纤维性能的影响[J].新型炭材料,2021,36(4):827-834,8.基金项目
The Joint Fund of the Ministry of Education for Pre-research (6141A02033231 and 6141A02033223),the Fundamental Research Funds for the Central Uni-versities (JD2012) and the Basic Research Plan(JCKY2018110C139). 基金项目:装备预研教育部联合基金(6141A02033231,6141A02033223) （6141A02033231 and 6141A02033223）
国防基础科研计划项目(JCKY2018110C139) （JCKY2018110C139）
中央高校基本业务费项目(JD2012). （JD2012）
