微米级聚甲基丙烯酸甲酯的热解特性及动力学研究

Kinetics and thermal decomposition characteristics of micron poly(methyl methacrylate)

随着超细粉体技术的发展,微米级高分子聚合材料的应用越来越广泛,但鲜见有对其热分解特性及动力学研究的报道。采用不同的加热速率对微米级聚甲基丙烯酸甲酯(PMMA)在氮气中的热分解特性进行了实验研究,结果表明,随着加热速率的提高,TG和DTG曲线均向高温区移动,热分解的起始温度、最大速率温度和终止温度也相应增加。通过微分法和积分法的综合运用,计算了不同加热速率下的平均表观活化能和指前因子,揭示了微米级PMMA在氮气中的热解机理,得出了热解模型。通过模型计算得到的TG曲线和实验测得的TG曲线吻合较好,进一步验证了所建热分解模型的可靠性。

With the development of ultra-fine powder technology,the micron polymer materials are widely used,but the research of thermal decomposition characteristics and kinetics of micron poly （methyl methacrylate）（PMMA） were rarely reported. The thermal behavior of PMMA was investigated by thermo gravimetric analysis in nitrogen atmosphere at different heating rates. The results showed that the TG and DTG curves shifted to higher temperature zone as the increase of the heating rate, and the initial temperature, final temperature, temperature at the maximum rate and the maximum rate also increased. Furthermore, the average apparent kinetic parameters were determined by the combination of differentiation and integration method. While,the thermal decomposition mechanism and thermal decomposition model of micron PMMA were proposed. Besides, the TG curves obtained by simulation were agree well with those of experiment measured, the reliability of this thermal decomposition model was further proved.