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Inverse‐microsuspension polymerization: Mechanism, kinetics and modelling
Author(s) -
Hunkeler David
Publication year - 1991
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19910470126
Subject(s) - cationic polymerization , monomer , polymerization , chemistry , polymer chemistry , aqueous solution , precipitation polymerization , radical polymerization , chemical engineering , organic chemistry , polymer , engineering
A mechanism has been developed for the inverse‐ microsuspension polymerization of acrylic water soluble monomers. This free‐radical reaction scheme includes elementary reactions for polymerization in the aqueous and organic phases, nucleation in the monomer droplets and heterophase oligoradical precipitation. The latter being the dominant initiation process. A unimolecular termination reaction with interfacial species has also been elucidated and has been found to compete with and often dominate over the conventional biomolecular reaction. A kinetic model is developed which includes the influence of ionogenic monomers and polyelectrolytes and is able to predict the rate, molecular weight and composition data well for polymerizations of acrylamide and copolymerizations with quaternary ammonium cationic monomers. A categorization and systematic nomenclature for heterophase water‐in‐oil and oil‐in‐water polymerizations is also developed based on physical, chemical and colloidal criteria.