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Desorption of free radicals in semibatch emulsion polymerization of methyl acrylate
Author(s) -
Chern C. S.
Publication year - 1995
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.1995.070560213
Subject(s) - desorption , methyl acrylate , emulsion polymerization , monomer , polymerization , kinetics , acrylate , polymer chemistry , chemistry , radical , emulsion , bulk polymerization , radical polymerization , reaction rate constant , thermodynamics , organic chemistry , polymer , physics , adsorption , quantum mechanics
Desorption of free radicals from particles can cause an emulsion polymerization system to deviate from Smith–Ewart case II kinetics. A mechanistic model has been developed to predict the effect of desorption of radicals from particles on the kinetics of semibatch emulsion polymerization of methyl acrylate under the monomer‐starved condition. Experimental data available in the literature are used to assess the proposed kinetic model. The model predicts the experimental data reasonably well for a wide range of monomer feed rates. The rate of polymerization increases with an increase in the rate of monomer addition. The kinetic data are also useful in evaluating the desorption rate constant ( K ′ d ) for methyl acrylate. The best fitted value of K ′ d at 50°C is 4 × 10 ‐12 cm 2 /s, which is in good agreement with the theoretical values predicted by desorption theory. © 1995 John Wiley & Sons, Inc.