可反应性纳米二氧化硅填充聚氯乙烯树脂在空气中的热分解行为

摘要

利用热重分析和差热重量分析(TG/DTG)技术研究了可反应性纳米二氧化硅填充聚氯乙烯(PVC-SiO2)树脂在空气气氛中的热分解行为,利用Ozawa-Flynn-Wall (OFW)方程和Friedman方程对其热分解进行了动力学分析.结果表明,可反应性纳米SiO2对PVC树脂热分解的第一阶段影响比较明显,当纳米SiO2添加量(质量分数)为1％时,PVC树脂热分解温度提高10.2℃；与此同时,纳米SiO2能提高PVC树脂热分解第一阶段的表观活化能,基于两种动力学方程的处理结果具有一致性.%The thermal decomposition behavior of poly vinyl chloride (PVC) resin filled with reactive nano-SiO2(RNS) in air atmosphere was studied by using thermogravimetric and differential thermogravimetric (TG/DTG) techniques. The thermal decomposition kinetic of the filled resin was calculated by making use of the Ozawa-Flynn-Wall (OFW) equation and the Friedman equation. Results show that RNS has a significant effect on the first-step thermal decomposition of PVC/RNS resin; and the incorporation of 1% (mass fraction) RNS leads to an increase in its thermal decomposition temperature by 10.2 "C . In the meantime, RNS filler is also able to greatly increase the apparent activation energy of PVC/RNS resin in the first-step thermal decomposition; and the results calculated by the two equations are well consistent with each other.