论文部分内容阅读
目的分析生物质材料对塑料废弃物热降解的影响,以聚甲基丙烯酸甲酯(PMMA)为对象,探讨甘蔗渣对其热分解行为和动力学的作用。方法利用溶液共混法制备PMMA/甘蔗渣混合物,采用热失重法研究其在氮气中的热分解过程,通过最大失重速率法和Ozawa等失重法计算PMMA热分解反应的动力学参数活化能和频率因子。结果甘蔗渣使得PMMA的初期热分解温度明显降低,但是PMMA的热分解活化能和频率因子却都显著增加。最大失重速率法的计算结果表明,PMMA加入甘蔗渣后的热分解活化能增加了26.2 k J/mol,等失重法的结果显示活化能和频率因子分别为168.14 k J/mol和28.41 min-1,比纯PMMA相应地增大了72.6 k J/mol和12.52 min-1。结论甘蔗渣的加入对PMMA的热降解有显著的影响,使其热分解变得困难,因此有必要进一步探讨其他生物质对PMMA热分解的影响。
Objective To analyze the effect of biomass materials on the thermal degradation of plastic wastes, and to investigate the effect of bagasse on the thermal decomposition behavior and kinetics of polymethylmethacrylate (PMMA). Methods The PMMA / bagasse mixture was prepared by solution blending method. The thermal decomposition process of the PMMA / bagasse mixture was studied by TG method. The kinetic parameters of PMMA thermal decomposition activation energy and frequency were calculated by maximum weight loss rate method and Ozawa weight loss method. factor. As a result, the initial pyrolysis temperature of PMMA decreased obviously with bagasse, but the activation energy and frequency factor of PMMA increased significantly. The calculation results of the maximum weight loss rate method show that the thermal decomposition activation energy of PMMA increased by 26.2 kJ / mol after addition of bagasse, and the weight loss method showed that the activation energy and frequency factor were 168.14 kJ / mol and 28.41 min-1, respectively , An increase of 72.6 kJ / mol and 12.52 min-1, respectively, compared to pure PMMA. Conclusion The addition of bagasse has a significant effect on the thermal degradation of PMMA, making it difficult to thermally decompose PMMA. Therefore, it is necessary to further investigate the effects of other biomass on the thermal decomposition of PMMA.