摘要
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）共混物的冲击性能进行了对比。结果表明：EPDM含量为17．5％时，PVC／EPDM-g-MAN缺口冲击强度达到91．9kJ／m^2；而CPE在含量为25％时，PVC／CPE共混物的缺口冲击强度可达到84．9kJ／m^2，说明EPDM-g-MAN具有更好的增韧效果。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。热重分析表明，EPDM-g—MAN的加入提高了PVC的热稳定性，使其分解温度提高了20-30℃。
EPDM-g-MAN, synthesized by suspension grafting copolymerization of methyl methacrylate and acrylonitrile onto EPDM, was blended with poly（vinyl chloride）（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 highest Izod notched impact strength of PVC/EPDM-g-MAN blend was 91.9 kJ/m^2 with 17. 5 wt% EPDM which was contrasted with 84. 9 kJ/m^2 of PVC/chlorinated polyethylene （CPE） blend with 25 wt% CPE. TEM and SEM analysis of the blends showed that PVC/EPDM-g-MAN was partially compatible. When the EPDM content was low, the toughening mechanism of the blends was branch and termination of crack, and changed to shear yielding and cavition as EPDM-g-MAN increased. TG and DTG analysis showed that the thermal stability of PVC was improved 20-30 ℃ after blended with EPDM-g-MAN.
出处
《中国塑料》
CAS
CSCD
北大核心
2009年第5期48-52,共5页
China Plastics
关键词
三元乙丙橡胶-甲基丙烯酸甲酯-丙烯腈接枝共聚物
聚氯乙烯
相结构
增韧机理
热稳定性
ethylene propylene diene terpolymer-methyl methacrylate-acrylonitrile graft copolymer
poly（vinyl chloride）
phase structure
toughening mechanism
thermal stability
