聚氯乙烯增韧改性剂的合成及共混改性研究

Synthesis of Modifier and Blending Modification of PVC

采用传统的乳液接枝聚合方法合成了以交联聚丙烯酸酯弹性体为核,聚氯乙烯(PVC)直接为壳层的新型聚氯乙烯复合改性剂,用于通用聚氯乙烯的增韧改性。通过粒径分析仪、透射电镜、动态力学分析等手段对复合粒子及其共混改性PVC材料进行了表征与测试。结果表明复合粒子具有核壳结构,粒径分布较窄;动态力学分析显示:改性剂的加入有效地改善了改性剂与PVC基体间的相容性;当改性剂加入量为6%(核壳质量比为50/50)时,改性PVC材料的缺口冲击强度为纯PVC的5倍。

A new kind of modifier of PVC was synthesized by means of conventional emulsion copolymerization, with crosslinked polyaerylate latices as core and PVC as shell, and the synthesized modifier was used to the toughening modification of general PVC. The composite particle and the modified PVC were characterized and determined via an analyzer of particle sizes, TEM and DMA. The results showed the P （BA-EHA）/PVC composite particles had a core-shell structure, and the distribution of the particle diameters of the composite was near. DMA results revealed that the compatibility between the P （BA-EHA）rubber and the matrix polymer （PVC） was well improved by the addition of the composite particles. When the adding amount of the P （BA-EHA）/PVC （core-shell ratio： 50：50）was 6 parts, the notched impact strength of the modified PVC was 5 times of that of pure PVC.