Determination of scission and crosslinking in gamma irradiated butyl rubber

Hill D.J.T., O'Donnell J.H., Senake Perera M.C. and Pomery P.J. (1992) Determination of scission and crosslinking in gamma irradiated butyl rubber. International Journal of Radiation Applications and Instrumentation. Part, 40 2: 127-138. doi:10.1016/1359-0197(92)90070-V


Author Hill D.J.T.
O'Donnell J.H.
Senake Perera M.C.
Pomery P.J.
Title Determination of scission and crosslinking in gamma irradiated butyl rubber
Journal name International Journal of Radiation Applications and Instrumentation. Part
ISSN 1359-0197
Publication date 1992-01-01
Sub-type Article (original research)
DOI 10.1016/1359-0197(92)90070-V
Volume 40
Issue 2
Start page 127
End page 138
Total pages 12
Abstract Structural changes in butyl rubber (a copolymer of isobutylene and 1.3% isoprene) after γ irradiation in vacuum at 303 and 398 K have been determined by 13C-NMR spectroscopy. A variety of new chain-end and crosslink structures have been identified and estimates made of the yields of main-chain scission, G(S), and crosslinking, G(X). Significant dependence of the yields on dose and temperature have been observed. Values of G(S) and G(X) have also been derived from dose dependence of the molecular weight averages Mn, Mw and Mz determined by GPC after irradiation at 77, 195, 303, 348 and 398 K, and are in good agreement with the values derived from the NMR spectra. Radicals formed on isobutylene units by H loss from methyl and methylene groups, and allyl radicals on isoprene units have been observed by ESR spectroscopy, and mechanisms proposed for crosslinking by the formation of H and Y links at the isoprene units.
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Scopus Import
 
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