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采用种子乳液聚合方法合成核壳结构丙烯酸酯类抗冲击改性剂(AIM),用于聚氯乙烯(PVC)树脂的增韧改性。使用Soxhlet抽提器、动态黏弹谱仪和扫描电子显微镜等测试AIM的交联度、接枝率、玻璃化转变温度及其在PVC中的分散情况。改变核橡胶相中交联剂的含量,研究PVC/AIM复合材料的力学性能与交联剂含量变化的关系。结果表明:核橡胶相中交联剂含量增加,橡胶的交联度增大,AIM的接枝率和接枝效率提高,玻璃化转变温度升高,共混物的韧性也随之变化。在w(PVC)/w(AIM)为100∶7、交联剂含量为0.75%时,共混物发生脆韧转变,冲击强度为1075J/m,为韧性断裂。
The core-shell acrylic impact modifier (AIM) was synthesized by seed emulsion polymerization for the toughening modification of polyvinyl chloride (PVC) resin. The cross-linking degree, grafting ratio, glass transition temperature and dispersion of the AIM in the AIM were measured using a Soxhlet extractor, a dynamic viscoelastic spectrometer and a scanning electron microscope. The content of crosslinking agent in the core-rubber phase was changed to study the relationship between the mechanical properties of PVC / AIM composites and the content of crosslinking agent. The results showed that the content of crosslinking agent increased, the crosslinking degree of rubber increased, the grafting ratio and grafting efficiency of AIM increased, the glass transition temperature increased, and the toughness of the blend also changed. When the ratio of w (PVC) / w (AIM) was 100: 7 and the content of crosslinking agent was 0.75%, the blend had a brittle and ductile transition with an impact strength of 1075 J / m.