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Improved particle size control for the dispersion polymerization of methyl methacrylate in supercritical carbon dioxide

McAllister, Thomas D.; Farrand, Louise D.; Howdle, Steven M.


Thomas D. McAllister

Louise D. Farrand


Dispersion polymerization is a well-established method of producing polymer particles that are easily handled and processed. With careful choice of reaction conditions this technique can yield well defined, spherical particles for a wide range of applications. The use of supercritical carbon dioxide (scCO2) as a reaction medium offers a route to performing these syntheses without excessive use of volatile organic solvents and minimizes work-up and disposal steps. However a significant drawback has been the fact that up till now the control of particle size and morphology from CO2 have been limited. This study presents control of particle size and morphology over an unprecedented range for a single stabilizer in scCO2 by coordinating a few simple parameters to tailor the conditions toward different sizes. Further, this study introduces the novel approach in scCO2 of using delayed monomer addition which allows considerable reduction of the batch-to-batch variability as well as reduced agglomeration between particles.


McAllister, T. D., Farrand, L. D., & Howdle, S. M. (in press). Improved particle size control for the dispersion polymerization of methyl methacrylate in supercritical carbon dioxide. Macromolecular Chemistry and Physics,

Journal Article Type Article
Acceptance Date Apr 25, 2016
Online Publication Date Jun 9, 2016
Deposit Date Jul 19, 2016
Publicly Available Date Jul 19, 2016
Journal Macromolecular Chemistry and Physics
Print ISSN 1022-1352
Electronic ISSN 1521-3935
Publisher Wiley
Peer Reviewed Peer Reviewed
Public URL
Publisher URL
Additional Information This is the peer reviewed version of the following article: McAllister, T.D., Farrand, L.D. and Howdle, S.M. (2016), Improved Particle Size Control for the Dispersion Polymerization of Methyl methacrylate in Supercritical Carbon Dioxide. Macromol. Chem. Phys., which has been published in final form at doi: 10.1002/macp.201600131. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.


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