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Kinetics of emulsion copolymerization with acrylic acids
Author(s) -
Shoaf Glenn L.,
Poehlein Gary W.
Publication year - 1991
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.1991.070420506
Subject(s) - styrene , methacrylic acid , copolymer , emulsion polymerization , polymer chemistry , acrylic acid , monomer , polymerization , aqueous solution , emulsion , aqueous two phase system , chemistry , radical polymerization , materials science , chemical engineering , polymer , organic chemistry , engineering
Abstract A kinetic model is presented that describes the reaction behavior of emulsion copolymerization systems where significant polymerization occurs in both the particle and aqueous phases. Equations for predicting aqueous‐phase free‐radical concentrations and aqueous‐phase and particle‐phase reaction rates are developed. A method for estimating the radical entry rate coefficient is also presented. The model is applied to two seeded carboxylated emulsion copolymerization systems, acrylic acid‐styrene and methacrylic acid‐styrene. Both experimental and predicted results reveal that the reaction behavior is greatly affected by the type of acid monomer, partition of monomer between the various phases, and locus of polymerization. The mechanism for the acrylic acid‐styrene system is more complicated than that for the methacrylic acid‐styrene system. Evidence suggests that the primary reaction locus in the acrylic acid‐styrene system shifts from the particles to the aqueous phase after the hydrophobic monomer, styrene, has been consumed.