EPDM／St-AN相反转乳液接枝共聚合及AES的结构与性能  

EPDM/St-AN Phase Inversion Emulsion Graft Copolymerization and Structure and Properties of AES

作　　者：代惊奇[1] 熊凯[1] 王炼石[1] 蔡彤旻 张安强[1] 

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：《中国塑料》2008年第2期37-41,共5页China Plastics

基　　金：广州市科技计划项目(2007Z2-D0161)

摘　　要：以过氧化二苯甲酰为引发剂,正庚烷为溶剂,用"相反转"乳液共聚合法合成了三元乙丙橡胶和苯乙烯-丙烯腈(St-AN)的接枝共聚物(EPDM-g-SAN),并与苯乙烯-丙烯腈共聚物(SAN)熔融共混(共混物简称 AES)。研究了丙烯腈 AN 在共单体中的含量和 EPDM/St-AN 的质量比对单体转化率、接枝率和接枝效率的影响。冲击实验表明,AN 含量为35%～40%时,接枝率约为35%,所制备的 EPDM-g-SAN 对 SAN 树脂有显著的增韧作用,增韧后所制得的工程塑料 AES 的悬臂梁缺口冲击强度最高可达50.7 kJ/m^2;差示扫描量热分析表明 AES 存在界面相;动态热力学分析表明 EPDM-g-SAN 与 SAN 树脂之间的相界面结合紧密;透射电镜和扫描电镜分析表明,AN 在共单体中的含量为35%时,EPDM-g-SAN 在 SAN 树脂基体中有良好的分散性,相界面模糊,因而两相结合紧密,其增韧机理以空穴化为主兼有剪切屈服。Styrene-EPDM-acrylonitrile tripolymer （EPDM-g-SAN） was prepared by grafting styrene （St） and acrylonitrile（AN） onto ethylene-propylene-diene mischpolymer （EPDM） via phase inversion emulsion copolymerization using benzoyl peroxide as an initiator and n-heptane as a solvent. AES was obtained via melt blending the prepared EPDM-g-SAN with SAN resin. The effects of weight ratios of AN/St and EPDM/co-monomers on the monomer conversion and degree of grafting were investigated. DSC and DMA showed that EPDM-g-SAN and SAN resin were partially compatible. TEM and SEM indicated that when AN weight percentage was 35 wt%, the interface between two phases became smeared, EPDM-g-SAN dispersed finely in the SAN matrix. When AN weight percentage in the comonomers was between 35 wt % and 40 wt %, the degree of grafting was about 35 %, the notched Izod impact strength of AES reached 50.7 kJ/m^2. The main toughening mechanism was cavitation accompanied with shear yielding.

关 键 词：三元乙丙橡胶 相反转 接枝共聚合 结构 性能 

分 类 号：TQ316.334[化学工程—高聚物工业]