聚丙烯/纳米金刚石复合材料热降解动力学研究

Kinetics of Thermal Degradation of Polypropylene/Nano-diamond Composites

用熔融共混法制备了聚丙烯/纳米金刚石(PP/Nano-diamond)复合材料,利用热失重分析法(TGA)研究了复合材料的热降解动力学,并采用Flynn-Wall-Ozawa、Friedman和Kissinger 3种方法计算了复合材料的热降解反应活化能(E_a)。结果表明,复合材料只呈现出一个热降解阶段,Nano-diamond有助于提高材料的热稳定性;复合材料的热稳定性随Nano-diamond含量的增加先增大后减小,当其含量为3%(质量分数,下同)时,复合材料的热稳定性最好,E_a提高了5~30 kJ/mol。

Polypropylene(PP)/Nano-diamond composites were prepared by melt blending,and their thermal degradation kinetics was investigated by means of thermogravimetry analysis(TGA).The thermal degradation activation energy(E_a) of the blends was calculated by Flynn-Wall-Ozawa,Friedman,and Kissinger methods.The non-isothermal degradation of PP/Nano-diamond composites is a one-stage process,and Nano-diamond could visibly enhance thermal stability of the composites.When the content of Nano-diamond was 3%,the thermal stability was the optimal,and E_a increased from 5 to 30 kJ/mol.