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Effect of emulsifier type on the copolymerization of styrene and acrylic acid
Author(s) -
CoronaGalvan S.,
MartinezGomez A.,
CastañedaPerez J.,
Puig J. E.,
Schulz P. C.,
Dominguez J. M.,
Ruano A.
Publication year - 1991
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.760310604
Subject(s) - copolymer , styrene , acrylic acid , cationic polymerization , dispersity , materials science , polymer chemistry , bromide , emulsion , chemical engineering , chemistry , organic chemistry , polymer , composite material , engineering
Abstract In this work we report the emulsion copolymerization of styrene and acrylic acid using a cationic (cetyltrimethylammonium bromide or CTAB) or an anionic (sodium dodecylsulfate or SDS) emulsifier. Latexes were stable and monodisperse with spherical particles of ∼100 nm for the CTAB latex and of ∼70 nm for the SDS latex. However, a random copolymer was produced with CTAB whereas a “blocky” copolymer was obtained with SDS. Here we propose a mechanism to explain these structural differences in terms of the relative reactivities of styrene and acrylic acid and of their initial location and distribution in the SDS and CTAB emulsions.