摘要
为制备甲基丙烯酸甲酯（MMA）-丙烯腈（AN）-二乙烯基苯（DVB）刚性微粒,在75℃、过硫酸钾（KPS）作引发剂、恒搅拌速率下研究了MMA/AN/DVB乳液共聚动力学,考察了KPS用量、单体配比、交联剂DVB对共聚速率的影响。结果表明乳液共聚速率Rp与KPS浓度的0.699次幂成正比,而且随着AN质量分数增加而下降。引发剂浓度指数偏离Smith-Eward理论模型可解释为体系中单体AN具有较大的水溶性,使成核胶粒数目增加的结果。当DVB用量在3%-5%时,聚合速率随DVB用量的增加而略有下降,在DVB用量为6%时,共聚速率明显上升。随交联剂DVB用量增加,共聚物粒径变大且分布变宽。
In order to prepare the crosslinking polymer microbeads, the free radical emulsion copolymerization of methylmethacrylate （MMA）, acrylonitrile （AN） and divinylbenzene （DVB） with the initiator potassium persulphate （KPS） at 75℃ under constant stirring speed was investigated. The effects of KPS concentration, mass ratio of monomers and dosage of crosslinker DVB on the rate of emulsion copolymerization （Rp） were also examined. The results show that Rp is proportional to the 0.669th power of KPS concentration, and decreases with increasing the mass ratio of monomer AN. The power value of KPS concentration mentioned above deviates from the theoretical power value of initiator concentration given by Smith-Eward model, which is due to the higher water-solubility of the monomer AN and its causing the increase of micelle numbers in emulsion copolymerization. It was also found that Rp decreases with the increase of DVB concentration when the amount of DVB is in the range of 3%-5% of monomers, while Rp is obviously increased with the increase of DVB concentration when DVB content is larger than 6%. On the other hand, with increasing DVB concentration, the size of crosslinking polymer microbeads increases and its size distribution widens.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2007年第4期725-728,共4页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省自然科学基金资助项目(2002-502111)
关键词
乳液共聚
交联聚合物微粒
丙烯腈
甲基丙烯酸甲酯
二乙烯苯
动力学
emulsion copolymerization
crosslinking polymer microbeads
acrylonitrile
methylmethacrylate
divinylbenzene
kinetics
