The determinants of latex monodispersity in emulsion polymerizations

Feeney, P.John, Napper, Donald H. and Gilbert, Robert G. (1987) The determinants of latex monodispersity in emulsion polymerizations. Journal of Colloid and Interface Science, 118 2: 493-505. doi:10.1016/0021-9797(87)90485-1


Author Feeney, P.John
Napper, Donald H.
Gilbert, Robert G.
Title The determinants of latex monodispersity in emulsion polymerizations
Journal name Journal of Colloid and Interface Science   Check publisher's open access policy
ISSN 0021-9797
1095-7103
Publication date 1987-08
Sub-type Article (original research)
DOI 10.1016/0021-9797(87)90485-1
Volume 118
Issue 2
Start page 493
End page 505
Total pages 13
Place of publication Maryland Heights, MO, United States
Publisher Academic Press
Language eng
Abstract The kinetic factors that determine the monodispersity of polystyrene latices produced by emulsion polymerization were explored, both experimentally and theoretically, in order to understand why certain surfactants (e.g., Aerosol MA) generate latices with a higher degree of monodispersity than others (e.g., sodium dodecyl sulfate). Three surfactants, Aerosol MA, Aerosol OT, and sodium dodecyl sulfate, were found experimentally to generate latices whose particle size distributions at the end of the nucleation period, although different, were all positively skewed. This skewness is in conformity with the coagulative nucleation theory. Experiments also showed that the free radical entry rate coefficient in the subsequent growth of the latex particles was inversely related to the number of latex particles generated, the latter being smaller for aerosol MA than for sodium dodecyl sulfate. Theoretical calculations based on coagulative nucleation theory showed that neither the duration of the nucleation period nor the form of the particle production rate curves was an important determinant of monodispersity at long times (although it may exert large effects at earlier times). In contrast, the monodispersity of the final latex produced was found theoretically to be critically dependent upon the entry rate parameter, the coefficient of variation of the latex being reduced as the entry rate coefficient increased. It can be inferred that Aerosol MA favors the production of a monodisperse latex primarily because it generates relatively few latex particles during nucleation: as a consequence, the free radical entry rate coefficient is relatively high (varying approximately inversely with particle number), which is conducive to the production of a monodisperse latex. Thus those properties of a surfactant that are able directly or indirectly to influence growth kinetics in emulsion polymerizations are important determinants of the size and size distribution of the latex particles ultimately generated. © 1987 Academic Press, Inc. All rights reserved.
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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