EPDM-g-MAN增韧聚氯乙烯的研究

用悬浮法合成三元乙丙橡胶（EPDM）与甲基丙烯酸甲酯（MMA）及丙烯腈（AN）接枝共聚物（EPDM-g-MAN），用其增韧聚氯乙烯（PVC）树脂。研究了PVC/EPDM-g-MAN共混物的抗冲击性能、增韧机理、相结构以及热稳定性，并与PVC/氯化聚乙烯(CPE)共混物的抗冲击性能进行了对比。结果表明：EPDM-g-MAN比CPE具有更好的增韧效率。SEM分析表明，随着EPDM-g-MAN用量的增加，共混物的增韧机理由裂纹支化终止转变为剪切屈服兼有空穴化。TEM分析表明，EPDM以分散相均匀分散于PVC连续相中，两相界面模糊，具有良好的相容性，且随着EPDM含量的增加，共混物的相结构由“海-岛”结构转变为近连续相结构。EPDM-g-MAN的加入提高了PVC的热稳定性。

Toughing Effect of EPDM-g-MAN on Polyvinylchloride Resin

EPDM-g-MAN, synthesized by suspension grafting copolymerization of methyl methacrylate and acrylonitrile onto EPDM, was blended with polyvinylchloride(PVC) resin. The mechanical properties、thermal stability、phase structure and toughening mechanism of the PVC/EPDM-g-MAN blends were studied by TG、SEM and TEM. The results show that: comparing with chlorinated polyethylene(CPE), EPDM-g-MAN had a better toughening effect on PVC resin. TEM and SEM analysis of the blends shows that PVC/EPDM-g-MAN were were partially compatible .When the EPDM content was low, the toughening mechanism of the blends was branch and termination of crack, and then changed into shear yielding and cavition as EPDM-g-MAN increasing.TG and DTG analysis shows that the thermal stability of PVC was improved after being blended with EPDM-g-MAN.