聚丙烯/纳米金刚石复合材料热降解动力学研究

用熔融共混法制备了纳米金刚石（Nano-diamond）/聚丙烯复合材料，利用热重分析（TGA）法研究了复合材料的热降解动力学，并采用Flynn-Wall-Ozawa，Friedman和Kissinger三种方法计算了共混物的热降解反应活化能(Ea)。结果表明，复合材料呈现单一阶段的降解过程，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%时，复合材料的热稳定性最好，热降解反应的Ea提高了5-30 kJ/mol。

Kinetics of Thermal Degradation of Nano-diamond/Polypropylene Composite Material

The different proportions of Nano-diamond/ polypropylene(PP) composites were prepared by melt blending, and thermal degradation kinetics of the composite material was investigated by means of thermogravimetry analysis(TGA). The thermal degradation activation energy(Ea) of the blends was calculated by Flynn-Wall-Ozawa, Friedman and Kissinger methods. The results show that the non-isothermal degradation of Nano-diamond/PP composites is a one-stage degradation process and Nano-diamond could visibly enhance thermal stability of the composite material. However, the enhancement of thermal stability becomes obvious with the increasing of Nano-diamond concentration, and then slight. When the content of Nano-diamond is 3%, the enhancement stands at maximum. And the increase of thermal degradation Ea varies from 5 kJ/mol to 30 kJ/mol.