核／壳型丙烯酸酯类R－PVC改性剂的研究

采用二步乳液聚合技术、合成了具有核／壳结构的硬质聚氯乙烯（Ｒ—ＰＶＣ）改性剂ＣＳ—ＡＣＲ—ＩＶ。借助于透射电镜和动态粘弹谱仪，考察了此改性剂的形态结构。利用Ｂｒａｂｅｎｄｅｒ塑化仪和毛细管流变仪研究了ＣＳ—ＡＣＲ—ＩＶ的用量及合成参数对Ｒ—ＰＶＣ加工性能的影响。试验结果表明，具有核／壳结构的ＣＳ—ＡＣＲ—ＩＶ能明显促进Ｒ—ＰＶＣ的塑化并降低熔体的表观粘度。

Study on Core-Shell Type Acrylic Modifier for Rigid PVC

A core-shell type acrylic modifier (GS-ACR-IV) for Rigid Polyvinyl Chloride (R-PVC) was synthesized by two-stage emulsion polymerization te chnique. The latex particle morphology of CS-ACR-IV was characterized by Transmission Electron Microscope (TEM) and Viscoelasticometer. The effects of adding amount of CS-ACR-IV and its synthetic parameters such as core sllell ratio, amount of crosslinking agent and molecular weight of PMMA on the processability of R-PVC were studied by means of a Brabender Plasticorder and a Capillary Rheometer. The experiments show that CS-ACR-IV which has core-shell morphology can promote the plasticization of R-PVC and decrease its apparrent melt viscosity.