聚丙烯／纳米碳管复合材料热降解动力学研究

以TGA为手段，进行了聚丙烯／纳米碳管复合材料的热降解动力学研究，采用了Kissinger和Vlynn—Wall—Ozawa两种方法计算了复合材料降解反应活化能。TG及DTG结果表明：降解一阶段完成。在5℃／min、10℃／min、20℃／min、40％／min升温速率下，最大热失重速率温度分别为441℃、452℃、477、486℃。随着加热速率的增加，热解温度向高温处横向位移。采用Kissingger法计算获得的活化能为36．298kJ／mol，采用Flynn—Wall—Ozawa法获得的活化能为215．95kJ／mol，均大于纯聚丙烯的活化能，纳米碳管的引入使材料的降解变得困难，热稳定性提高。

Study on Thermal Degradation Kinetics of Polypropylene/Carbon Nanotube Composites

The thermal degradation kinetics of the polypropylene(PP)/carbon nanotube(CNTS) composites was studies by thermo gravimetric analysis at different heating rates.The activation energies and correlation coefficients were calculated by Kissinger and Flynn-Wall-Ozawa methods.The results of TG and DTG indicated that there was only one main degradation step and the thermal degradation of the composites shifted towards higher temperatures as the heating rate increased.The degradation rate reached maximum at 441°C,452°C,477°C and 486°C when the heating rate were 5℃/min,10℃/min,20℃/min and 40℃/min,respectively.The activation energy of the reactions were 36.298kJ/mol and 215.95kJ/mol calculated by Kissingger and Flynn-Wall-Ozawa method,respectively.The addition of the carbon nanotube increased the activation energies of the blend systems,improved the thermal stability and made the thermal degradation more difficult.