Emulsifier-free emulsion copolymerization of styrene and acrylamide using an amphoteric initiator

被引:28
作者
Fang, SJ
Fujimoto, K
Kondo, S
Shiraki, K
Kawaguchi, H
机构
[1] Keio Univ, Div Sci & Technol, Dept Appl Chem, Kohoku Ku, Yokohama, Kanagawa 2238522, Japan
[2] Zhejiang Univ, Inst Polymer Sci & Engn, Hangzhou 310027, Peoples R China
[3] Wako Pure Chem Ind Ltd, Cent Lab, Kawagoe, Saitama, Japan
关键词
emulsifier-free emulsion polymerization amphoteric initiator; amphoteric latex; styrene; acrylamide;
D O I
10.1007/s003960000337
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Emulsifier-free emulsion copolymerization of styrene (St) and acrylamide (AAm) has been investigated in the presence of an amphoteric water-soluble initiator, 2,2'-azobis[N-(2-carboxyethyl)-2-2-methylpropionamidine]hydrate (VA057). The kinetics of polymerization and the colloidal properties of the resulting latices were studied and compared with the cases using ionic initiators. When adopting the amphoteric initiator at pHs lower than 10, stable amphoteric poly (St/AAm) latices, evidenced by the electrophoretic mobility, were prepared directly. Meanwhile, almost the same conversion versus time curves appeared and there were no apparent differences in the final particle sizes for those polymerizations, whereas in the polymerization at pH 10, a much lower rate of copolymerization and a larger size of particles were observed. The surface charge density and the growth rate of latex particles produced with VA057 at pH < 10 were comparable to those of the particles with a cationic initiator, 2,2'-azobis(2-amidinopropane)dihydrochloride, but were apparently lower than those with an anionic initiator, potassium persulfate, when the polymerizations were carried out under corresponding conditions. The number of initiator fragments incorporated onto the particle surfaces was independent of polymerization pH, except for pH 10. The abnormal performance of VA057 at pH 10 was attributed to its degradation due to hydrolysis.
引用
收藏
页码:864 / 871
页数:8
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