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Title: Profluorescent nitroxides: Sensors and stabilizers of radical-mediated oxidative damage
Contributor(s): Blinco, James P (author); Keddie, Daniel  (author); Wade, Tim (author); Barker, Philip J (author); George, Graeme A (author); Bottle, Steven E (author)
Publication Date: 2008
DOI: 10.1016/j.polymdegradstab.2008.05.028
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Abstract: In this study, three profluorescent nitroxides 1,1,3,3-tetramethyldibenzo[e,g]isoindolin-2-yloxyl (TMDBIO), 1,1,3,3-tetramethyl-2,3-dihydro-2-azaphenalene-2-yloxyl (TMAO) and 5-[2-(4-methoxycarbonyl-phenyl)-ethenyl]1,1,3,3-tetramethylisoindoline-2-yloxyl (MeCSTMIO) were tested as probes for radical-mediated damage in polypropylene arising from both UV and thermally initiated sources. These nitroxides possess a very low fluorescence quantum yield due to quenching by the nitroxide group; however, when the free-radical moiety is removed by reaction with alkyl radicals (to give an alkoxyamine), strong fluorescence is observed. The results obtained from this profluorescent nitroxide trapping technique compare favourably with other methods of monitoring degradation, provided the appropriate probe is chosen for the conditions of oxidation, signalling an indication of damage well before other techniques show any response. The technique was also applied to the monitoring of crosslinked polyester coating resins. Differentiation in the oxidative stability of the resins was evident after as little as 200 min where other monitoring techniques require up to 300 h of accelerated degradation. This highlights the sensitivity of this method as well as demonstrating the scope of this technique to assess polymer stability.
Publication Type: Journal Article
Grant Details: ARC/CE0561607
Source of Publication: Polymer Degradation and Stability, 93(9), p. 1613-1618
Publisher: Elsevier Ltd
Place of Publication: United Kingdom
ISSN: 1873-2321
Field of Research (FOR): 030399 Macromolecular and Materials Chemistry not elsewhere classified
030501 Free Radical Chemistry
030301 Chemical Characterisation of Materials
Socio-Economic Outcome Codes: 970103 Expanding Knowledge in the Chemical Sciences
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
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