摘要
用粒径小于０９ｍｍ的粉末改性ＮＲ（ＰＭＮＲ）与苯乙烯丙烯腈共聚物（ＳＡＮ）共混，研究共混体的力学性能及ＰＭＮＲ的性质对共混体冲击强度的影响。结果表明，ＰＭＮＲ对ＳＡＮ有显著的增韧效果。以交联ＮＲ的溶胀指数为１０９、乙烯基链质量分数和溶解度参数δ分别为０２０和９４９的３０份ＰＭＮＲ增韧ＳＡＮ，其共混体的Ｃｈａｒｐｙ式无缺口冲击强度可达６０ｋＪ·ｍ－２左右。用扫描电镜进行的冲击断面形貌分析表明，共混体的增韧机理以剪切屈服为主兼有多重银纹化。
The modified NR powder(PMNR) with the particle size less than 0 9 mm was blended with styrene acrylonitrile copolymer(SAN).The mechanical properties of the blends and the influence of PMNR on the impact strength of blends were investigated.The results showed that PMNR had an excellent toughening effect on SAN.When 30 phr(by mass) of PMNR with the solubility parameter δ of 9.49,in which the swelling index of crosslinked NR and the mass proportion of vinyl chain were 10.9 and 0.20 respectively,was used,the blend having an unnotched Charpy impact strength of 60 kJ·m -2 or so was obtained.It was found from the analysis of the impact cross section on SEM that the toughening mechanism was mainly the shear yielding with some degree of multiple crazings.
出处
《橡胶工业》
CAS
北大核心
1998年第9期515-519,共5页
China Rubber Industry
基金
国家自然科学基金
广东省自然科学基金
