为了研究生活垃圾中废弃塑料热解过程中的协同作用，利用TG-FTIR-MS耦合分析方法，系统研究聚氯乙烯（PVC）、聚苯乙烯（PS）及其共热解过程中的热失重行为、官能团变化和气相产物特征。在此基础上，分析PVC单组分与PVC/PS混合热解特性的差异及其产生差异的原因。结果表明：单独PVC热解的主要气相产物是氯化氢（HCl）和少量氯代烃。PS热解过程主要是苯乙烯单体解聚和少量无规则断链反应。PVC与PS共热解有较强的协同作用，热解主要分为两个阶段。第一阶段（235~326 ℃）主要生成HCl和氯代烃，第二阶段（326~516 ℃）主要产物为烷烃、烯烃及少量芳香族化合物，因此可以选择在235~326 ℃温度范围内进行脱氯处理。相比PVC单独热解，PVC与PS共热解时氯的释放受到抑制，HCl的产量减少，固体产物中的氯含量增加。研究结果可为生活垃圾热解技术的发展提供一定的支持。

To investigate the synergistic effects during the pyrolysis process of waste plastics in municipal solid waste, a TG-FTIR-MS coupling analysis method was utilized to systematically study the thermogravimetric behavior, functional group changes, and gaseous product characteristics during the pyrolysis of polyvinyl chloride (PVC), polystyrene (PS), and their co-pyrolysis. On this basis, the differences in pyrolysis characteristics between pure PVC and PVC/PS mixtures were analyzed, along with the reasons for these differences. The results showed that the main gaseous products of PVC pyrolysis were hydrogen chloride (HCl) and small amounts of chlorinated hydrocarbons. In the PS pyrolysis process, the main reactions were depolymerization into styrene monomers and a small amount of random chain scission. There was a strong synergistic effect during the co-pyrolysis of PVC and PS, which could be divided into two stages. In the first stage (235~326 ℃), the primary products were HCl and chlorinated hydrocarbons, while in the second stage (326~516 ℃), the main products were alkanes, olefins, and small amounts of aromatic compounds. Therefore, dechlorination treatment could be carried out within the temperature range of 235~326 ℃. Compared with the pyrolysis of pure PVC, chlorine release was inhibited during the co-pyrolysis of PVC and PS, resulting in reduced HCl production and increased chlorine content in the solid products. The findings can provide support for the development of municipal solid waste pyrolysis technology.