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Extended mechanistic description of particle growth in electrosterically stabilized emulsion polymerization systems
Citation
Thickett, SC and Gaborieau, M and Gilbert, RG, Extended mechanistic description of particle growth in electrosterically stabilized emulsion polymerization systems, Macromolecules, 40, (13) pp. 4710-4720. ISSN 0024-9297 (2007) [Refereed Article]
Copyright Statement
Copyright 2007 American Chemical Society
Abstract
Polymeric (steric and electrosteric) stabilizers, based on water-soluble polymers such as poly(acrylic acid) and poly(ethylene oxide), are widely used to make surface coatings by emulsion polymerization and form a "hairy layer" which provides colloidal stability to the latex particles. It is shown by a combination of NMR and rate studies that the growth of these polymer colloids is dominated by a hitherto unsuspected combination of mechanisms: an abstraction reaction in the "hairy layer" which results in a radical on the water-soluble polymer which is slow to propagate but quick to terminate (Macromolecules 2006, 39, 6495−6504) and can also undergo β-scission reactions. Termination with radicals which would otherwise lead to particle growth leads to radical loss, i.e., a slower polymerization rate, while β-scission leads to radicals which can enter the water phase and cause secondary particle formation. Both of these effects are undesirable from a manufacturing point of view, and the newly discovered mechanism could be used to mitigate these undesirable features.
Item Details
Item Type: | Refereed Article |
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Research Division: | Chemical Sciences |
Research Group: | Macromolecular and Materials Chemistry |
Research Field: | Polymerisation Mechanisms |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding Knowledge |
Objective Field: | Expanding Knowledge in the Chemical Sciences |
UTAS Author: | Thickett, SC (Dr Stuart Thickett) |
ID Code: | 99406 |
Year Published: | 2007 |
Web of Science® Times Cited: | 29 |
Deposited By: | Chemistry |
Deposited On: | 2015-03-23 |
Last Modified: | 2015-04-14 |
Downloads: | 0 |
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