聚氯乙烯/多壁碳纳米管复合材料的热降解研究

Thermal Degradation of Polyvinyl Choride/Multi-Walled Carbon Nanotubes Composites

采用熔融共混法制备了聚氯乙烯/多壁碳纳米管(PVC/MWCNT)复合材料,利用热失重法研究了MWCNT对PVC热降解及热寿命的影响,采用Kissinger法和Friedman法计算了复合材料的热降解动力学参数。结果表明,添加MWCNT后,复合材料的初始降解温度T 0和最大热失重速率温度T m较纯PVC均有提高,含量4%时,T 0和T m分别提高了18.9℃和22.76℃。Kissinger法计算的活化能随MWCNT含量增加呈先增大后减小趋势,在含量4%时复合材料两个失重阶段分别提高了82.23 kJ/mol和18.54 kJ/mol,Friedman法计算得到的活化能变化趋势与Kissinger法一致。

The PVC/MWCNT composite materials were prepared by the melt blending method,the effects of carbon nanotubes on the thermal degradation and thermal life of PVC were studied by the heat loss method,and the thermal degradation Kinetics parameters of the composites were calculated by the Kissinger method and Friedman method.The results showed that the initial degradation temperature T 0 and the maximum thermal weightlessness rate T m were higher than pure PVC after the addition of MWCNT.At 4% content,T 0 and T m increased 18.9℃ and 22.76℃ respectively.The activation energy calculated by the Kissinger method increased first and then decreased with the increase of MWCNT content.At the 4% content,the two weightless stages increased 82.23 kJ/mol and 18.54 kJ/mol,respectively,and the change trend of activation energy calculated by Friedman method was consistent with that calculated by Kissinger method.