通过动态TG和DTG分析,研究了木浆和棉浆粘胶纤维于200℃～500℃、在惰性气体中的热裂解反应.经过初始的平台区后,木浆和棉浆粘胶纤维在300℃～350℃较窄的温度区间内迅速降解,紧接着则是逐渐缓慢地失重.通过TG和DTG两条曲线,利用Friedman方程,并对其传统解法进行改进,可以确定粘胶纤维降解的活化能、反应级数和指前因子等动力学参数.结果表明,两种粘胶纤维和其他种类纤维素物质有着相似的热裂解行为.
The thermal pyrolysis behaviors of two types of rayon fibers derived from wood pulp and cotton pulp have been investigated in the temperature range of 200～500℃ by dynamic TG and DTG in an argon atmosphere. Like other cellulosic materials, the weight loss of the wood-derived and cotton-derived rayon fibers levels off after a sharp decrease over a narrow temperature range of 300～350℃. The values of activation energy E, order of reaction n, and frequency factor A have been determined by the modified Friedman equation, using TG and DTG data. Results show that both types of rayon fibers have similar kinetic behaviors, comparable with those of other cellulosic materials.
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