E.s.r. measurements of the propagation rate coefficient for styrene free radical polymerisation

Tonge, Matthew P., Kajiwara, Atsushi, Kamachi, Mikiharu and Gilbert, Robert G. (1998) E.s.r. measurements of the propagation rate coefficient for styrene free radical polymerisation. Polymer, 39 11: 2305-2313. doi:10.1016/S0032-3861(97)00507-7


Author Tonge, Matthew P.
Kajiwara, Atsushi
Kamachi, Mikiharu
Gilbert, Robert G.
Title E.s.r. measurements of the propagation rate coefficient for styrene free radical polymerisation
Journal name Polymer   Check publisher's open access policy
ISSN 0032-3861
1873-2291
Publication date 1998-05
Sub-type Article (original research)
DOI 10.1016/S0032-3861(97)00507-7
Volume 39
Issue 11
Start page 2305
End page 2313
Total pages 9
Place of publication Oxford, United Kingdom
Publisher Elsevier
Language eng
Formatted abstract
Electron spin resonance (e.s.r.) spectroscopy should be useful for the measurement of propagation rate coefficients (kp) in free radical polymerisations, since the propagating radical concentration can be directly observed. However, in previous studies, kp values have generally been inconsistent, and disagreed with data from other accepted experimental techniques, such as pulsed laser polymerisation. This study shows that for styrene, consistency can be obtained, but only when experimental conditions are selected such that polymer of sufficiently high molecular weight is formed; otherwise incorrect rate constants may be measured. The measured Arrhenius parameters were in good agreement with IUPAC accepted data. The values at 343 K for both thermally and photochemically initiated experiments were found to be consistent, suggesting that photoinitiated systems may polymerise in the ground state. Some previously inconsistent data could be explained in terms of selection of experimental conditions.
Keyword Electron spin resonance
Styrene
Propagation rate coefficient
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemistry and Molecular Biosciences
Centre for Nutrition and Food Sciences Publications
 
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Created: Mon, 07 Mar 2011, 15:58:37 EST