中文摘要：

采用氯化原位接枝技术制备了苯乙烯（St）改性氯化聚氯乙烯（PVC-C）。研究了St单体加入量、氯含量对PVC-C物理、力学性能及流变性能的影响。结果表明，St的加入量为10份左右时，改性PVC-C的拉伸屈服强度达到最大值（69MPa），较未改性PVC-C约提高17％，但维卡软化点降低；改性PVC-C的拉伸屈服强度和维卡软化点均随氯含量的增加而提高；改性PVC-C的熔体粘度较未改性PVC-C的低，加工温度范围变宽。

英文摘要：

Styrene（St） modifying chlorinated polyvinyl chloride（PVC-C） was synthesized by in-situ chlorinated graft method. The influences of chloride content and St adding amount on the physical property, mechanical property and rheological performance of PVC-C were investigated. The results showed that the yield strength in tension of modified PVC-C reached the maximum of 69 MPa, which was 117% higher than that of unmodified PVC-C, but the vicar softening temperature decreased when St amount was about 10 parts ; The yield strength in tension and vicar softening temperature were both increased with the increase of chlorinity. The melt viscosity of modified PVC-C was lower than that of unmodified PVC-C, and modified PVC-C had wider processing temperature.