Simultaneous FT-NIR and ESR analyses to yield propagation rate coefficients for polymerization of methyl methacrylate based monomers

Le, Tri T. and Hill, David J. T. (2003) Simultaneous FT-NIR and ESR analyses to yield propagation rate coefficients for polymerization of methyl methacrylate based monomers. Polymer International, 52 11: 1694-1700. doi:10.1002/pi.1295


Author Le, Tri T.
Hill, David J. T.
Title Simultaneous FT-NIR and ESR analyses to yield propagation rate coefficients for polymerization of methyl methacrylate based monomers
Journal name Polymer International   Check publisher's open access policy
ISSN 0959-8103
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1002/pi.1295
Volume 52
Issue 11
Start page 1694
End page 1700
Total pages 7
Place of publication UK
Publisher John Wiley
Collection year 2003
Language eng
Subject C1
250502 Physical Chemistry of Macromolecules
780103 Chemical sciences
Abstract A hyphenated instrumental approach has been used to obtain reliable values for the propagation rate coefficients as a function of conversion for polymerizations of methyl methacrylate (MMA) and a mixture of MMA and ethyleneglycol dimethacrylate (EGDMA) with a 1:1 concentration of double bonds, from near the onset of the Trommsdorf region into the glass region. ESR spectroscopy was used to measure the radical concentration while FT-NIR fibre-optic spectroscopy was employed to measure instantaneously the double-bond concentration within the temperature-controlled cavity of the ESR instrument during polymerization. The advantage of this approach to the measurement of the rate coefficient is that it is equally applicable to branching and linear polymerizations. For the polymerization of methyl methacrylate, the values of the rate coefficient at the lowest conversions at which reliable values could be obtained were in agreement with recently reported values obtained by the PLP-SEC method. For the lowest conversions, the values obtained were 403 1 mol(-1) s(-1) at 306 K for MMA and 5201 mol(-1) s(-1) at 310 K for a 1:1 mixture of MMA and EGDMA. (C) 2003 Society of Chemical Industry.
Keyword Polymer Science
Mma
Egdma
Hyphenated Esr/ft-nir
Propagation Rate Coefficient
Free-radical Polymerization
Electron-spin-resonance
Emulsion Polymerization
Kinetic-parameters
High-conversion
Spectroscopy
Bulk
Styrene
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: 2004 Higher Education Research Data Collection
School of Chemistry and Molecular Biosciences
 
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Created: Wed, 15 Aug 2007, 11:51:04 EST