EPDM／St-An相反转乳液接枝共聚合行为及EPDM-g-SAN对SAN树脂的增韧效应  

EPDM/St-An Graft Copolymerization Reaction Behavior by Phase Inversion Emulsion and the Toughness Effect of EPDM-g-SAN on SAN Resin

作　　者：代惊奇[1] 王炼石[1] 蔡彤旻 熊凯[1] 张安强[1] 曾祥斌 

机构地区：[1]华南理工大学材料科学与工程学院,广东广州510640 [2]广州金发科技股份有限公司,广东广州510520

出　　处：《高分子材料科学与工程》2008年第6期54-57,共4页Polymer Materials Science & Engineering

摘　　要：用“相反转”乳液接枝共聚合法合成了三元乙丙橡胶与苯乙烯-丙烯腈共聚单体的接枝共聚物（EPDM—g—SAN），将其与苯乙烯-丙烯腈共聚物（SAN）树脂共混制备了耐天候老化黄变性能优异的高抗冲工程塑料（AES）。研究了An在共单体中的比率及EPDM／St-An的配比对接枝反应行为及AES的缺口冲击强度的影响。结果表明，随着An比率的增加，单体转化率（CR）出现峰值，其中最高CR为97．5％，接枝率（GR）与接枝效率（GE）则逐渐提高；AES的缺口冲击强度在An的质量百分比为35％～40％范围内出现峰值，其中最大冲击强度为53．0kJ／m^2。SEM和TEM分析表明，An比率为35％的EPDM-g-SAN在SAN树脂基体中有良好的分散性，相界面结合牢固，并证实其AES的增韧机理既有空穴化又有剪切屈服。Styrene-EPDM-acrylonitrile tripolymer （EPDM-g-SAN） was synthesized by graft copolymerization of styrene and acrylonitrile （St-An） onto ethylene-propylene-diene terpolymer （EPDM） with ＂phase inversion＂ emulsification technique. AES was prepared by blending SAN resin with EPDM-g-SAN. The effects of An ratio in co-monomer and EPDM/St-An proportion on graft copolymerization reaction behavior and AES notched impact strength were studied. The results show that monomer conversion rario exhibits the peak values with An ratio increasing; grafting ratio and grafting efficiency enhance gradually as well. AES notched impact strength appears peak values when An ratio is at the range of 30 % -35 %. SEM and TEM analysis illuminate the good compatibility of EPDM-g-SAN at An ratio of 35 % and SAN resin, and approves that the main toughening mechanism is cavitation and shear yielding.

关 键 词：相反转乳液接枝共聚合 EPDM—g-SAN AES 增韧 扫描电镜 透射电镜 

分 类 号：TQ316.334[化学工程—高聚物工业]