Comparison of oil-soluble and water-soluble initiation of styrene polymerization in a three-component microemulsion |
| |
Authors: | J E Puig V H Pérez-Luna M Pérez-González E R Macías B E Rodríguez E W Kaler |
| |
Institution: | (1) Present address: Facultad de Ciencias Quimicas, Universidad de Guadalajara, Boul. M. García Barragán # 1451, 44430 Guadalajara, Jal, México;(2) Department of Chemical Engineering, University of Delaware, Newark, USA |
| |
Abstract: | The polymerization of styrene in three-component oil-in-water microemulsions made with the cationic surfactant dodecyltrimethylammonium bromide is studied by dilatometry and quasielastic light scattering as a function of type and concentration of initiator. Fast polymerization rates, high conversions, and high molecular weight polymers are achieved with both oil-soluble (AIBN) and water-soluble (potassium persulfate) initiators. The rate of polymerization shows initiation and termination intervals, but no constant-rate interval is observed. Stable monodisperse microlatexes are obtained with both types of initiators. For both AIBN and potassium persulfate, polystyrene molecular weight is proportional to initiator concentration I]–0.4 and particle radii decrease as I]–0.2. Polymerization initiation occurs in or at the microemulsion droplets, and polymer particles grow by recruiting monomer and surfactant from uninitiated swollen micelles. |
| |
Keywords: | Styrene polymerization latex microemulsion polystyrene |
本文献已被 SpringerLink 等数据库收录! |
|