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Dispersion Polymerization of Styrene Employing Lyophilic Comonomer in the Absence of Stabilizer: Synthesis of Impurity-free Microspheres  

Han, Hye-Kyung (Department of Chemical Engineering, Inha University)
Lee, Jeong-Woo (Department of Chemical Engineering, Inha University)
Hong, Jin-Ho (Department of Chemical Engineering, Inha University)
Shim, Sang-Eun (Department of Chemical Engineering, Inha University)
Publication Information
Macromolecular Research / v.17, no.7, 2009 , pp. 469-475 More about this Journal
Abstract
We investigated the feasibility of dispersion polymerization without any stabilizer, which has been considered essential for ensuring colloidal stability. By employing small amounts of a lyophilic comonomer, 4-vinyl pyridine, styrene was successfully polymerized by dispersion polymerization in aqueous alcohol without stabilizer to afford stable poly(styrene-co-4-vinyl pyridine) copolymer microspheres. The stable microspheres were produced in the 4-vinyl pyridine range of 2-15 wt% to styrene. Without 4-vinyl pyridine, severely coagulated particles were obtained, implying that the poly(4-vinyl pyridine) moiety endowed colloidal stability. The polymerization kinetics, behavior, and properties of the ultimate particles showed general features of dispersion polymerization. The study results suggest that stabilizer- tree dispersion polymerization is possible, thereby facilitating the synthesis of impurity(stabilizer)-tree polymer particles.
Keywords
poly(styrene-co-4-vinyl pyridine); stabilizer-free; dispersion polymerization; microspheres;
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