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采用TG/DTG法对煤沥青基炭纤维原丝和预氧化丝的热转化进行了研究。选用Freeman-Carroll动力学模型进行了非等温微分计算,计算结果表明煤沥青炭纤维原丝和预氧化丝在350～420℃的反应活化能分别为17.77 kJ/mol和33.65 kJ/mol,在同一温度下预氧化丝反应速率受温度的影响程度比原丝大。在热转化温度区间内原丝的热转化反应为1级反应,预氧化丝的热转化反应为较复杂的1.4级反应。
The thermal conversion of coal tar pitch based carbon fiber precursor and preoxidized silk was studied by TG / DTG method. Freeman-Carroll kinetics model was used to calculate the non-isothermal differential. The calculated results show that the activation energies of coal tar pitch carbon fibers and preoxidized fibers are 17.77 kJ / mol and 33.65 kJ / mol at 350-420 ℃, respectively. Pre-oxidized silk reaction temperature under the influence of temperature greater than the original thread. The thermal conversion reaction of the precursor yarns is a first order reaction in the thermal conversion temperature range. The thermal conversion reaction of the preoxidized yarns is a more complex 1.4-step reaction.