摘要
以2,2’-偶氮二异丙基咪唑啉二盐酸盐(VA-044)为引发剂,在聚乙二醇(PEG)水溶液中采用双水相聚合法进行了丙烯酰胺(AM)/甲基丙烯酰氧乙基三甲基氯化铵(DMC)/甲基丙烯酸甲酯(MMA)的三元共聚合,与AM/DMC共聚进行对比,系统研究了疏水单体MMA在双水相聚合过程中所起的作用。通过紫外分光光度计在线检测双水相聚合的相分离过程,发现当MMA浓度增大时,分相时的临界转化率和临界分子量均减小,说明MMA具有促进相分离的功能。通过改进溴化法确定单体转化率,发现MMA能加速双水相聚合反应速率。通过旋转黏度计测试聚合体系的表观黏度,发现MMA的引入会增大体系的表观黏度。通过激光粒度仪检测聚合体系的液滴尺寸及分布,发现MMA能加快聚合物液滴的成长。
An aqueous two-phase copolymerization initiated with 2,2＇-azobis[2-（2-imidazolin-2-yl）propane]dihydrochloride （VA-044） and used acrylamide （AM）, 2-methylacryloylxyethyl trimethyl ammonium chloride（DMC）, and methyl methacrylate （MMA） as monomers was carried out in poly（ethylene glycol） （PEG） aqueoussolutions. The effects of hydrophobic monomer MMA on the aqueous two-phase copolymerization ofcationic acrylamide were investigated using approaches such as UV spectroscopy, an improved bromatingmethod, viscosity and particle size analysis. It is found that the critical conversion and critical molecular weightare decreased when MMA concentration increased, which suggests that MMA could accelerate the phaseseparation process. The polymerization rate and the apparent viscosity are improved because of the addition of MMA. The results show that MMA can facilitate droplets growth after the phase separation process.
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2014年第2期426-430,共5页
Journal of Chemical Engineering of Chinese Universities
基金
浙江省杰出青年基金(R4110199)
关键词
甲基丙烯酸甲酯
丙烯酰胺
甲基丙烯酰氧乙基三甲基氯化铵
双水相共聚合
methyl methacrylate
acrylamide
2-methylacryloylxyethyl trimethyl ammonium chloride
aqueous two-phase copolymerization
