摘要
以三元乙丙橡胶(EPDM)与共单体(M)甲基丙烯酸甲酯(MMA)、苯乙烯(St)和丙烯腈(AN)为原料,以悬浮接枝共聚合法合成了接枝共聚物EPDM-g-MAS,用其与SAN树脂共混制备了耐老化黄变性能优异的高抗冲塑料AEMS。研究了EPDM/M悬浮接枝共聚合的反应条件对单体转化率(CR)、接枝率(GR)、接枝效率(GE)以及AEMS冲击性能的影响。结果发现,EPDM/M悬浮接枝体系具有较高的CR、GR和GE,在适宜的聚合条件下,CR、GR和GE分别最高可达95.7%、75.3%和94.3%。接枝产物EPDM-g-MAS对SAN树脂具有显著的增韧作用。当EPDM/AEMS质量百分率为15%,AEMS的悬臂梁缺口冲击强度高达29.5kJ/m2。SEM分析表明,当EPDM含量低时,AEMS的增韧机理为裂纹支化及终止机理,当EPDM含量高时为裂纹终止与轻度剪切屈服机理。TG和热氧老化试验分析表明,AEMS比AES有更好的热稳定性和耐热氧老化黄变性能。
EPDM-g-MAS was prepared by graft copolymerization of methyl methacrylate （MMA）, styrene （St）and acrylonitrile（AN） onto ethylene-propylene-diene terpolymer（EPDM） with suspension polymerization. The high impact plastics （AEMS）, which had excellent resistance to weatherability and yellow discoloration and ageing property, were prepared by blending EPDM-g-MAS with SAN resin. The effects of the condition of suspension grafting copolymerization on monomer conversion ratio（CR） , grafting ratio（GR） , grafting efficiency（GE） and the impact strength of AEMS were investigated. The results showed that CR,GR and GE were high while befittingly, CR, GR and GE were 95.7% ,75.3% and 94. 3% ,respectively. The grafting copolymer had a remarkable toughening effect on SAN. When the EPDM/AEMS mass ratio was 15% ,the notched lzod impact strength of AEMS reached 29. 5kJ/m^2. SEM analysis indicated that when the EPDM content was low, the toughening mechanism were branch and termination of crack. When the EPDM content was high, the toughening mechanism were crack termination and slight shear yielding of matrix. TG analysis and thermal oxidization and ageing test showed that AEMS performed better thermal stability and weathering ageing and yellow discoloration resistivity than AES.
出处
《塑料》
CAS
CSCD
北大核心
2008年第3期18-20,60,共4页
Plastics
基金
广州市科技计划重点项目(2007Z2-D0161)
