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Mixed initiator approach to the surfactant‐free semicontinuous emulsion polymerization of large MMA/BA particles
Author(s) -
O'Callaghan K. J.,
Paine A. J.,
Rudin A.
Publication year - 1995
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1995.070581116
Subject(s) - ammonium persulfate , emulsion polymerization , dispersity , polymer chemistry , polymerization , copolymer , pulmonary surfactant , polymer , particle size , chemical engineering , radical polymerization , emulsion , chemistry , materials science , organic chemistry , engineering
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.