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Entry and exit rate coefficients in emulsion polymerization of styrene
Author(s) -
Asua J. M.,
De La Cal J. C.
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.1991.070420708
Subject(s) - emulsion polymerization , styrene , radical , polymer , polymerization , materials science , diffusion , particle (ecology) , polymer chemistry , emulsion , radical polymerization , thermodynamics , chemistry , copolymer , composite material , organic chemistry , physics , oceanography , geology
The rate coefficient for entry of radicals into the polymer particles and the radical exit rate coefficient were estimated in seeded emulsion polymerization of styrene. The dependence of both coefficients on the particle size was used in an attempt to discriminate between the models proposed for these coefficients. The results obtained were found to be consistent with a model in which the entry of radicals into the polymer particles occurs by the propagational mechanism and the radicals desorb from the polymer particles by diffusion. A comparison between the estimated values of the coefficients and those calculated theoretically using the equations derived from the corresponding mechanisms was performed.