Molecular weight distribution in emulsion polymerizations

Lichti, Gottfried, Gilbert, Robert G. and Napper, Donald H. (1980) Molecular weight distribution in emulsion polymerizations. Journal of Polymer Science. Part A, Polymer Chemistry, 18 4: 1297-1323. doi:10.1002/pol.1980.170180415

Author Lichti, Gottfried
Gilbert, Robert G.
Napper, Donald H.
Title Molecular weight distribution in emulsion polymerizations
Journal name Journal of Polymer Science. Part A, Polymer Chemistry   Check publisher's open access policy
ISSN 0887-624X
Publication date 1980-04
Sub-type Article (original research)
DOI 10.1002/pol.1980.170180415
Volume 18
Issue 4
Start page 1297
End page 1323
Total pages 27
Place of publication Hoboken, NJ, United States
Publisher John Wiley & Sons
Language eng
Abstract A mathematical formulation is given which describes the evolution of the number distribution of the molecular weight (MWD) of linear polymer chains that grow in emulsion polymerization systems. The resulting set of coupled ordinary differential equations takes into account the microscopic events of free radical entry, exit, chain annihilation, bimolecular termination (by combination and disproportionation), and chain transfer in a mono- or polydisperse system. Simple analytic solutions are presented for systems in which the number of particles, as well as the average number of free radicals per particle, is constant and in which the rate coefficients are size independent. These solutions indicate that compartmentalization of the free radicals in the latex particles results in a significant increase in the polydispersity of the polymer produced by emulsion polymerization, compared with that in bulk systems. The theory shows that significant mechanistic information may be obtained from experimental MWDs and that, in principle, experimental conditions may be prescribed to grow a desired MWD. The MWDs are presented in a novel manner that facilitates the comparison of theory with experiment.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ
Additional Notes Article first published online: 11 March 2003.

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, 15:50:31 EST