Particle Size Distributions in Electrosterically Stabilized Emulsion Polymerization Systems: Testing the "Mid-Chain-Radical" Hypothesis

Thickett, Stuart. C., Morrison, Bradley and Gilbert, Robert. G. (2008) Particle Size Distributions in Electrosterically Stabilized Emulsion Polymerization Systems: Testing the "Mid-Chain-Radical" Hypothesis. Macromolecules, 41 10: 3521-3529. doi:10.1021/ma800166k


Author Thickett, Stuart. C.
Morrison, Bradley
Gilbert, Robert. G.
Title Particle Size Distributions in Electrosterically Stabilized Emulsion Polymerization Systems: Testing the "Mid-Chain-Radical" Hypothesis
Journal name Macromolecules   Check publisher's open access policy
ISSN 0024-9297
Publication date 2008-04-26
Year available 2008
Sub-type Article (original research)
DOI 10.1021/ma800166k
Open Access Status
Volume 41
Issue 10
Start page 3521
End page 3529
Total pages 9
Editor Lodge, Timothy. P.
Place of publication United States
Publisher 2008 American Chemical Society
Language eng
Subject C1
860199 Processed Food Products and Beverages (excl. Dairy Products) not elsewhere classified
030399 Macromolecular and Materials Chemistry not elsewhere classified
Abstract It has been found [Thickett, S. C.; Gaborieau, M.; Gilbert, R. G. Macromolecules 2007, 40, 4710-4720] that rate and characterization data on the seeded growth of latex particles electrosterically stabilized by a "hairy layer" of anchored poly(acrylic acid) (pAA) can be qualitatively and quantitatively explained by mechanistic events involving mid-chain radicals (MCRs). A considerable range of data was found to be consistent with the supposition that these MCRs are formed by abstraction on the pAA during polymerization, and are slow to propagate but quick to terminate, and thus are a cause of radical loss; they may also undergo P-scission leading to secondary particle formation. Results are reported here for four additional types of experiments on the evolution of the particle size distribution (PSD) in these systems; all these experiments have the potential to refute the mechanistic hypothesis. The experiments comprise (i) evolution of the PSD of small particles, (ii) evolution of the PSD in a bimodal system (competitive growth), (iii) growth rates of separate experiments of small and large particles with the same total amount of pAA, and (iv) the amount of secondary nucleation (formation of small particles) with both pAA and also with poly(ethylene oxide) steric stabilizers. In each case, the data are qualitatively and quantitatively consistent with the predictions of the mid-chain-radical mechanisms and thus support the general applicability of this effect.
Keyword Polymer Science
Polymer Science
POLYMER SCIENCE
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

 
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Created: Thu, 16 Apr 2009, 01:40:12 EST by Emma Cushworth on behalf of School of Land, Crop and Food Sciences