中国塑料

中国塑料 ›› 2008, Vol. 22 ›› Issue (02): 37-41 .DOI: 10.19491/j.issn.1001-9278.2008.02.008

• 材料与性能 • 上一篇    下一篇

EPDM/St-AN相反转乳液接枝共聚合及AES的结构与性能

代惊奇，熊凯，王炼石，蔡彤旻，张安强   

  1. 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s10s20
  • 收稿日期:2007-09-05 修回日期:1900-01-01 出版日期:2008-02-26 发布日期:2008-02-26

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

DAI Jing-qi，XIONG Kai，WANG Lian-shi，CAI Tong-min，ZHANG An-qiang   

  1. 1. Department of Polymer Materials Science and Engineering, South China University of Technology,Guangzhou 510640, China; 2. Guangzhou Kingfa Science and Technology Co.，Ltd.，Guangzhou 510520, China
  • Received:2007-09-05 Revised:1900-01-01 Online:2008-02-26 Published:2008-02-26
  • Contact: WANG Lian-shi

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)，并与苯乙烯一丙烯睛共聚物(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/m2;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Stet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.

关键词: 三元乙丙橡胶, 相反转, 接枝共聚合, 结构, 性能

Abstract: Styrene-EPDM一acrylonitrile tripolymer(EPDM-g-SAN)was prepared by grafting styrene
(St) and acrylonitrile(AN)onto ethylene-propylene-dime 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/m2.the main toughening mechanism was cavitation accompanied with shear yielding.

Key words: ethylene-propylene-dime mischpolymer, phase inversion, graft copolymerization, structore;property;styrene-EPDM一acrylonitrile tripolymer and styrene-acryonitrile copolymer blend

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