交联剂对PVC/AIM复合材料性能的影响

Effect of Crosslinker on Mechanical Properties PVC/AIM Composite

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。

Aiming at modifying toughness of polyvinyl chloride （PVC） resin, core-shell structured acrylic impact modifiers （AIM） was synthesized via seeded emulsion polymerization. The crosslinkage,grafting yield and glass transition temperature of AIM and its dispersion in resin were investigated by means of Soxhlet extraction, dynamic mechanical analysis and scanning electron microscope, and so on. The relationship of mechanical properties of PVC/AIM composite and the variation of crosslinker content was explored. The results showed that the crosslinkage of rubber,grafting yield and grafting efficiency and glass transition temperature of AIM increased with the crosslinker increasing,and the toughness of composite was improved to some extent. When the mass ratio of PVC/AIM attained 100：7 and crosslinker was 0. 75 % ,the brittle-ductile transition would take place and the impact strength was 1075 J/re.