苯乙烯-丙烯酸丁酯分散共聚合动力学  

Kinetic of Styrene-Butylacrylate Dispersion Copolymerization

作　　者：张星[1] 玄泽亮[1] 程雷[1] 郑玉婴[1] 

机构地区：[1]福州大学化学化工学院,福建福州350108

出　　处：《高分子材料科学与工程》2011年第4期13-16,20,共5页Polymer Materials Science & Engineering

基　　金：福建省科技计划重大专项专题项目(2007HZ0001-2);福建省自然科学基金计划资助项目(E0710010)

摘　　要：用分散聚合法制备了表面光滑、粒径均匀的聚苯乙烯-丙烯酸丁酯微球,研究了各种参数变化对聚合转化率-时间曲线的影响并得到苯乙烯和丙烯酸丁酯的分散聚合动力学方程。结果表明,在所考察的范围内,初始单体中丙烯酸丁酯的物质的量分数超过20%以上时,总转化率明显降低;在60℃~75℃之间随温度上升,总转化率增大,但80℃时反而减小,并随着醇水比的降低、引发剂用量的增大而增大,稳定剂的浓度对其影响甚小;在所考察的范围内,苯乙烯和丙烯酸丁酯的分散聚合动力学方程为Rp=k.exp（38194/RT）[St/BA]0.7029[m（EtOH）/m（EtOH＋H2O）]-4.138[AIBN]0.3845,其表观活化能Ea为38.194 kJ/mol。Mnodisperse micron-size polystyrene-butyl acrylate microspheres with smooth spherical surface were prepared by dispersion polymerization.The dependence of conversion-time on different parameters was studied,moreover,the kinetic equation of dispersion copolymerization was also obtained.The results show that when the monomer molar ratio BA/St is higher than 20/80 the total conversion decreases significantly,the total conversion increases with the temperature increasing from 60℃ to 75 ℃ and decreases when 80 ℃,the total conversion increases with the decrease of EtOH/H2O ratio and with the increase of initiator concentration.The dependence of total conversion on stabilizer concentration was not pronouncedly.The kinetic equation of the polymerization can be expressed as： Rp=k·exp（38194/RT）0.7029[m（EtOH）/m（EtOH＋H2O）]-4.1380.3845（60 ℃～75 ℃）.The overall activation energy for the rate of polymerization is 38.194 kJ/mol.

关 键 词：分散聚合 聚苯乙烯-丙烯酸丁酯 聚合动力学 

分 类 号：TQ316.342[化学工程—高聚物工业]