Journal
POLYMER DEGRADATION AND STABILITY
Volume 92, Issue 9, Pages 1737-1742Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2007.05.020
Keywords
stabilized fiber; pre-carbonization; chemical structure; pyrolysis; carbon fiber
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A series of PAN-based pre-carbonized fibers were prepared in pilot carbonization line at gradient temperature of 350-600 degrees C. DSC, FTIR, X-ray diffraction, EPR and elemental analysis were used to study the evolution of chemical structures in these pre-carbonized fibers. At the same time, the reaction mechanism during the pre-carbonization was also explored. According to the chemical structural changes, the process of pre-carbonization below 600 degrees C can be divided into three stages. Below 450 degrees C, cross-linking and aromatization are the main reactions accompanied by heat liberation and rearrangement of oxygen-containing groups. But around 500 degrees C the pyrolysis reactions acquire the priority and the aromatization structure is dominant in the fibers. Until 600 degrees C the ladder polymers cross-link to form the carbon basal planes, resulting in the growth of aromatization structures. Based on the dependence of fiber structure on temperature, the pre-carbonization technology was optimized. (C) 2007 Elsevier Ltd. All rights reserved.
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