Mixed initiator approach to the surfactant-free semicontinuous emulsion polymerization of large MMA/BA particles

Autor:	Anthony J. Paine, K. J. O'Callaghan, Alfred Rudin
Rok vydání:	1995
Předmět:	Materials science Polymers and Plastics Bulk polymerization Dispersity Emulsion polymerization General Chemistry Surfaces Coatings and Films chemistry.chemical_compound chemistry Polymerization Polymer chemistry Materials Chemistry Copolymer Precipitation polymerization Ammonium persulfate Sulfate
Zdroj:	Journal of Applied Polymer Science. 58:2047-2055
ISSN:	1097-4628 0021-8995
DOI:	10.1002/app.1995.070581116
Popis:	The emulsion polymerization of large monodisperse MMA/BA copolymer particles by surfactant-free means at high solids content is described. A series of sequential seeded growth reactions were used to obtain monodisperse particles with diameters of at least 3 microns. A combination of an oil-soluble initiator, AIBN, and a water-soluble initiator, ammonium persulfate (AP), was used. The AIBN initiated the bulk of the polymerization and the AP provided the stabilization for the polymer particles through its charged endgroups. The amount of AP initiator to be used in each growth step was calculated empirically using a criterion of a constant ratio of moles of sulfate groups to the polymer particle surface area. © 1995 John Wiley & Sons, Inc.
Databáze:	OpenAIRE
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