Kinetics of particle growth in emulsion polymerization systems with surface-active initiators

Kusters, J.M.H., Napper, D.H., Gilbert, R.G. and German, A.L. (1992) Kinetics of particle growth in emulsion polymerization systems with surface-active initiators. Macromolecules, 25 25: 7043-7050. doi:10.1021/ma00051a049


Author Kusters, J.M.H.
Napper, D.H.
Gilbert, R.G.
German, A.L.
Title Kinetics of particle growth in emulsion polymerization systems with surface-active initiators
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
1520-5835
Publication date 1992-12-01
Year available 1992
Sub-type Article (original research)
DOI 10.1021/ma00051a049
Open Access Status Not Open Access
Volume 25
Issue 25
Start page 7043
End page 7050
Total pages 8
Place of publication Washington, DC, United States
Publisher American Chemical Society
Language eng
Abstract The seeded kinetics of particle growth in an emulsion polymerization of styrene where initiation is by a surface-active initiator ("inisurf") were investigated. These systems are characterised by a low n̄ (average number of radicals per latex particle). The rate coefficient for free-radical exit was obtained using γ-radiolysis relaxation by replacing the inisurf with its (noninitating) surfactant moiety. The resulting value was then used to determine the rate coefficient for radical entry and the initiator efficiency in seeded studies initiated by an inisurf, with varying amounts of surface coverage. The initiator efficiency, calculated using these entry rate coefficients and the measured initiator decomposition rate coefficient, was very low (ca. 0.04%) and independent of surface coverage. This result is readily explained qualitatively and quantitatively by comparison of the time for geminate recombination of the two free radicals formed by inisurf decomposition with the time for escape by diffusion of one of those free radicals from the vicinity of the particle.
Keyword Latex-particles
Free-radicals
Ionic Surfactants
Styrene
Adsorption
Entry
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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