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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

DOI: doi:10.1021/ma070837f

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
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
Author:Thickett, SC (Dr Stuart Thickett)
ID Code:99406
Year Published:2007
Web of Science® Times Cited:26
Deposited By:Chemistry
Deposited On:2015-03-23
Last Modified:2015-04-14
Downloads:0

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