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Textile Research Journal
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Effect of Heating Rate on the Chemical Reaction during Stabilization of Polyacrylonitrile Fibers

Yongping Hou

Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China, yongpinghou04{at}yahoo.com.cn

Tongqing Sun

Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China

Haojing Wang

Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China

Dong Wu

Key Laboratory of Carbon Materials, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, People's Republic of China

The influence of the heating rate on the stabilization process of polyacrylonitrile (PAN) fibers was studied. The results show that with an increase in heating rate, the density and oxygen content show a continuous decrease. As a result, the strength continues to increase and the skin-core structure becomes more evident. However, the amount of shrinkage and the conversion index (A I) are lowest at 5°C/min. On the basis of these observations, we conclude that at a heating rate lower than 5°C/min the intramolecular cyclization is the main reaction and its extent decreases with an increase in heating rate. Above 5°C/min, an intermolecular cross-linking reaction becomes more obvious and increases with an increase in heating rate.

Key Words: chemical reaction • heating rate • polyacrylonitrile fiber

Textile Research Journal, Vol. 78, No. 9, 806-811 (2008)
DOI: 10.1177/0040517507090500
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