论文部分内容阅读
采用种子乳液聚合制备了丙烯酸酯核/壳结构聚合物,总转化率超过95%,乳胶粒理论粒径与实测值基本一致,说明聚合体系没有明显的二次成核过程。将其用于硬质聚氯乙烯改性,当加入量为3phr时,就能产生显著的增韧效果,常温缺口冲击强度达到16.51 kJ/cm2,而拉伸强度基本保持不变。扫描电镜分析冲击断口表明,核/壳聚合物已经很好分散到聚氯乙烯基体中,呈网状结构,为明显的韧性断裂过程。该研究有望应用于工业生产。
Acrylate core / shell structure polymer was prepared by seed emulsion polymerization. The total conversion rate was more than 95%. The theoretical particle size of latex particles was consistent with the measured value, indicating that there was no obvious secondary nucleation in the polymerization system. When it is used in the modification of rigid PVC, the toughening effect can be remarkably enhanced when it is added at 3 phr. The notched impact strength at room temperature reaches 16.51 kJ / cm2, while the tensile strength remains basically unchanged. Scanning electron microscopy (SEM) analysis of the impact fracture shows that the core / shell polymer has been well dispersed into the PVC matrix with a network structure, which is a significant ductile fracture process. The study is expected to be applied to industrial production.