金属氧化物对聚氯乙烯热解释放HCl的影响研究

利用热重分析仪并借助电导率测定法探讨了几种金属氧化物对聚氯乙烯（PVC）热解时HCl释放过程的影响。结果表明，HCl溶液在0 ~ 5.5×10^-4 mol / L浓度范围内与电导率呈线性关系。ZnO、Fe₂O₃、CuO、MnO₂使PVC的热解起始温度降低，从而使单位质量PVC释放HCl的起始时间缩短，对PVC热解脱HCl有明显的促进作用。而TiO₂、MoO₃、V₂O₅却使PVC的热解起始温度升高，起始脱HCl时间增加，对HCl的脱出反应有较强的抑制作用。但加入金属氧化物的PVC体系释放HCl总量并没有超过纯PVC体系。

Effects of Metal Oxides on the Release Characteristic of HCl from the Combustion of Poly (vinyl chloride)

Thermogravimetry and electric conductivity determinations were carried out to study the effects of metal oxides on the release characteristic of HCl from the combustion of PVC. It was found that the electric conductivity was linearly related to the concentration of HCl solution in the range of 0 ~ 5.5×10^-4 moL/L. Zinc oxide (ZnO), ferric oxide (Fe₂O₃), copper oxide (CuO), and manganese dioxide (MnO₂) decreased the initiative temperature of PVC during thermal degradation, and shortened the initiative time of HCl releasing, and thus accelerated the HCl emission. In the other hand, titanium dioxide (TiO₂), molybdenum dioxide (MoO₂), and vanadium oxide (V₂O₅) increased the initiative temperature of PVC during thermal degradation, extended the initiative time of HCl releasing, and thus inhibited the HCl emission. The total volume of HCl released from PVC/metal oxides didnot exceed that of neat PVC.