中间相沥青纤维氧化增重过程 - Ingenta Connect.PDF

1158 2012 40 8 Vol. 40No. 8 2 0 1 2 8 JOURNAL OF THE CHINESE CERAMIC SOCIETY August 2012 ( 410082) 230290 Δw t0.3 Arrhenius TQ342.742 A 0454–5648(2012)08–1158–05 2012–07–30 13:23:34 /kcms/detail/11.2310.TQ1323.201208.1158_012.html Mass Increase During Oxidative Stabilization of Mesophase Pitch Fiber YE ChongCHEN ShilinLI Weiwei FEI Youqing (College of Materials Science and Engineering, Hunan University, Changsha 410082, China) Abstract: The effects of heating rate, ultimate oxidation temperature and residence time on the oxidative stabilization of mesophase pitch fiber were investigated by thermogravimetry and scanning electron microscopy. The relationships among oxidation time, tem- perature and mass gain were examined. It was found that the oxidative mass gain at a constant reaction temperature (230–290 ) was proportional to a simple fractional exponent of oxidation time (t0.3). A simple and accurate mathematical model was proposed to de- scribe the overall kinetics of oxidative stabilization for mesophase pitch fiber with respect to temperature effect by the Arrhenius equation. The time required to achieve desired oxidation mass gain at a given reaction temperature can be predicted by the model for isothermal oxidative stabilizations. Key words: mesophase pitch; carbon fiber; oxidative stabilization; thermal analysis; kinetic model (PAN) [3] [4] PAN 1/31/4 PAN [5]