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Seeded emulsion polymerization of styrene: influence of acrylic acid on the particle growth process
Author(s) -
Slawinski M.,
Schellekens M. A. J.,
Meuldijk J.,
Van Herk A. M.,
German A. L.
Publication year - 2000
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/(sici)1097-4628(20000516)76:7<1186::aid-app22>3.0.co;2-n
Subject(s) - emulsion polymerization , acrylic acid , styrene , polymer chemistry , copolymer , potentiometric titration , polymerization , conductometry , emulsion , titration , aqueous solution , particle (ecology) , particle size , chemistry , chemical engineering , materials science , organic chemistry , chromatography , polymer , ion , oceanography , engineering , geology
The seeded batch emulsion copolymerization of styrene and acrylic acid was studied. The polymerization rate was investigated with pH as the main parameter. Some attempts were made to evaluate the average number of growing chains per particle during Stage II of the emulsion polymerization process. The final latex products were characterized by means of conductometric aqueous titration and potentiometric titration in an organic solvent mixture. The distribution of the acid groups over the aqueous phase, the particle surface, and the interior of the particles together with the kinetic results provided insight into important features governing the incorporation of acrylic acid. The results indicate that pH is the dominating parameter for the incorporation process. An optimal incorporation on the surface of the particles is observed for a low value of pH. In that case, all the acid groups are protonated. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1186–1196, 2000