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Accumulation and desorption of free radicals in emulsion copolymerization
Author(s) -
Hagiopol Cornel,
Deleanu Theodor,
Memetea Tatiana
Publication year - 1989
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.1989.070370409
Subject(s) - copolymer , polybutadiene , radical , desorption , polymer chemistry , monomer , chemistry , acrylonitrile , chain transfer , styrene , potassium persulfate , photochemistry , radical polymerization , organic chemistry , polymer , adsorption
The emulsion copolymerization of styrene with acrylonitrile, seeded on a polybutadiene support and initiated either potassium persulfate or γ‐rays has been studied. The original technique of support activation consists of two steps: the start of the copolymerization in the presence of a small fraction of monomers, followed by the addition of the rest of monomers, which leads to a great increase in the reaction rate. The experimental data provide evidence for a new mechanism that takes into account the desorption–reentry of the free oligoradicals into another particle, their transfer to the polybutadiene support, which results in the accumulation of trapped free radicals. As a consequence of free radicals' accumulation, the overall copolymerization rate increases. The accumulation as well as the desorption processes place this type of copolymerization far from Smith–Ewart theory case II.