New Evaluation on the Preoxidation Extent of Different PAN Precursors

材料科学技术（英）, 2004, 20(4): 369-372.

^1, , ^2, , ^3,

1.Department of Mechanical Engineering, Zhongyuan Institute of Technology, Zhengzhou 450007, China

2.Department of Carbon Fibers and Composites, Beijing University of Chemical Technology, Beijing 100029, China

3.Department of Carbon Fibers and Composites, Beijing University of Chemical Technology, Beijing 100029, China

基金项目: 国家自然科学基金(50172004,50273002 and50333070)

New Evaluation on the Preoxidation Extent of Different PAN Precursors

Structural changes in carbon fibers at each stage of, especially, preoxidation process are well known to play a great role in achieving the ultimate product quality. Differential scanning calorimetry (DSC), scanning electron microscope (SEM), density method and optical microscope were used to characterize the preoxidation extent. A conventional pproach, e.g., density aim, to evaluate the extent of preoxidation is not very exact. A DSC curve of a PAN precursor only can provide general information, major in the temperature regime of preoxidation reaction. However,the evaluation of a preoxidation extent, especially from conventional preoxidation temperature with a great span egime of 200～400℃, is put forward in this paper, in which the evolution of core/shell morphological structure is a kind of straightforward evidence.

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New Evaluation on the Preoxidation Extent of Different PAN Precursors

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