聚丙烯/煤矸石复合材料热降解动力学研究

Kinetics of thermal degradation of polypropylene/coal gangue powder composite

通过熔融共混制备了聚丙烯/煤矸石(PP/CG)复合材料,并采用热重分析(TG-DTG)法研究了共混体系的热降解动力学,利用Kissinger法、Flynn-Wall-Ozawa法和Friedman法计算了共混体系的表观活化能。结果表明:共混体系的热降解均表现为单一个失重阶段的降解过程,说明CG与基体PP之间具有良好的相容性;随CG质量分数增加共混体系的起始降解温度(To)和最大失重速率温度(Tm)呈升高趋势,说明体系热稳定性逐渐提高;共混体系的活化能随CG的添加量变化,共混体系的活化能在煤矸石含量为20%达到最大值,比纯PP提高了20.29kJ/mol。

To improve the thermal property of polypropylene（PP）,the polypropylene/coal gangue（PP/CG）compos ires were prepared from CG and PP by melt-blending method. The different methods such as thermogravimetry analysis （TGA）, differential thermogravimetry analysis （DTG）, Kissinger method, Flynn-Wall Ozawa and Friedman method were used to characterize the thermal property of composites. The results showed that the composites had only one-stage thermal degradation process. The CG＂ presence caused a shift of the initial mass 10ss temperature To and the temperature of maxi- mum rate of weight loss Tm to higher temperatures. The activation energies（Ea）changed as the PP/CG content changed. The maximum Eo was achieved when the mass fraction of CG in composites was up to 20%, which was higher（20.29kJ/ mol）than pure PP.