摘要
研究了原丝在氧化过程中体密度、线密度、力学性能、环化交联程度、元素组成的变化,结果表明:(1)随着氧化温度的加深,预氧丝交联度和环化指数增加,线密度降低,体密度增加,预氧丝模量、断裂伸长和强度降低。(2)随着氧化程度的加深,纤维致密性增加。(3)随着氧化程度的加深,纤维C、H、N元素含量及H/C、N/C比例逐步降低,预氧丝总体O和O/C增加,在氧化反应初期纤维Si含量迅速减少,然后基本稳定。(4)氧化过程中预氧丝表面的O含量基本恒定,预氧丝表面的含氧量高于中心含氧量。
The changes of volume density, linear density, mechanical properties, surface composition, the amount of cyclization and crosslinking in fibers during oxidative stabilization in air were investigated. Results show that the amount of crosslinkiing, cyclization. and volume density of oxidized PAN fibers increase, while linear density, elastic modulus, tensile strength and elongation to failure decrease with increasing oxidation temperature. The fibers were densified during stabilization. The content of carbon, hydrogen and nitrogen and the ratios of hydrogen and nitrogen to carbon decrease while the total oxygen and the ratio of oxygen to carbon increase from the outside to inside of the oxidized PAN fiber. The amount of silicon decreases sharply at first, then levels off during stabilization. The oxygen content in the surface of the fiber remains unchanged during stabilization, and is always greater than that in the core.
出处
《新型炭材料》
SCIE
EI
CAS
CSCD
2003年第3期186-190,共5页
New Carbon Materials
基金
中国科学院创新方向性项目(KGCX2 SW 204)
山西省自然科学青年科技研究基金(20021013)
太原市科技启明星计划
