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Title: A Novel Profluorescent Dinitroxide for Imaging Polypropylene Degradation
Contributor(s): Fairfull-Smith, Kathryn (author); Blinco, James P (author); Keddie, Daniel  (author); George, Graeme A (author); Bottle, Steven E (author)
Publication Date: 2008
DOI: 10.1021/ma701944p
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Abstract: Free-radical processes underpin the thermo-oxidative degradation of polyolefins. Thus, to extend the lifetime of these polymers, stabilizers are generally added during processing to scavenge the free radicals formed as the polymer degrades. Nitroxide radical precursors, such as hindered amine stabilizers (HAS), are common polypropylene additives as the nitroxide moiety is a potent scavenger of polymer alkyl radicals (R•). Oxidation of HAS by radicals formed during polypropylene degradation yields nitroxide radicals (RR'NOD•), which rapidly trap the polymer degradation species to produce alkoxyamines, thus retarding oxidative polymer degradation. This increase in polymer stability is demonstrated by a lengthening of the "induction period" of the polymer (the time prior to a sharp rise in the oxidation of the polymer). Instrumental techniques such as chemiluminescence or infrared spectroscopy are somewhat limited in detecting changes in the polymer during the initial stages of degradation. Therefore, other methods for observing polymer degradation have been sought as the useful life of a polymer does not extend far beyond its "induction period". A sensitive technique for monitoring the alkyl radical precursors to polymer degradation involves spin-trapping by profluorescent nitroxides.
Publication Type: Journal Article
Grant Details: ARC/CE0561607
Source of Publication: Macromolecules, 41(5), p. 1577-1580
Publisher: American Chemical Society
Place of Publication: United States of America
ISSN: 0024-9297
Field of Research (FOR): 030399 Macromolecular and Materials Chemistry not elsewhere classified
030503 Organic Chemical Synthesis
030501 Free Radical Chemistry
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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