中文摘要：

研究不同稳定体系对聚氯乙烯（PVC）的加工流变行为、力学性能和维卡软化点的影响，通过对比，评价复合稀土稳定剂的综合性能．结果表明，复合稀土稳定体系具有良好的综合加工性能，大大改善PVC材料的力学性能．扫描电镜及红外光谱分析证实，稀土热稳定剂具有偶联增韧作用；热分析结果表明，PVC—HREC（稀土稳定剂）体系在氮气中的热降解反应较为简单，为一步反应，通过外推得到其起始降解温度和终止降解温度分别为264．82，325．47℃．

英文摘要：

Influence of different thermal stabilization system of polyvinylchlorid （PVC） on the processing rheological properties, mechanical properties and vicar softening temperature were studied. The result indicates that compound rareearth stabilization system has excellent whole processing property and could improve the mechanical properties evidently. The coupling effect of rare-earth stabilizer were investigated by SEM and FT-IR analysis. In addition, the result of DSC-TGA shows the thermal degradability of PVC-HREC system in N2 is one-step reaction. The initiative degraded temperature and final degraded temperature, obtained by extrapolation, are 264. 82 ℃ and 325.47 ℃ respectively.