Effect of polymerization kinetics on particle morphology in heterogeneous systems

Mills, M.F., Gilbert, R.G. and Napper, D.H. (1990) Effect of polymerization kinetics on particle morphology in heterogeneous systems. Macromolecules, 23 19: 4247-4257. doi:10.1021/ma00221a011

Author Mills, M.F.
Gilbert, R.G.
Napper, D.H.
Title Effect of polymerization kinetics on particle morphology in heterogeneous systems
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
Publication date 1990-09
Sub-type Article (original research)
DOI 10.1021/ma00221a011
Volume 23
Issue 19
Start page 4247
End page 4257
Total pages 11
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The kinetics of seeded emulsion homopolymerization are modeled by formulation and solution of the reaction-diffusion equations describing the monomer and free-radical distributions within the latex particles. The simulations predict significant inhomogeneities may develop at high conversion, giving rise to core-shell morphology in the fully polymerized latex as observed experimentally. The extent of nonuniformity is most pronounced for large particles and is not present in small particles under normal conditions. The origin of inhomogeneities may be understood mechanistically in terms of the depth of penetration of free radicals into the latex particles. Dependence of the morphology on various factors including rates of diffusion, propagation, termination, entry, transfer, and exit is discussed. While predictions are in partial agreement with experimental studies of morphology, a number of uncertainties remain unresolved and warrant further investigation. However, the model provides some understanding of the role of the polymerization kinetics in determining morphology and is successful in explaining the experimentally observed lowering of the apparent propagation rate coefficient in large particles.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Centre for Nutrition and Food Sciences Publications
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Created: Mon, 07 Mar 2011, 15:53:09 EST