Probing oxidative degradation in polymers using {sup 17}O NMR spectroscopy

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Understanding the mechanism of oxidative degradation remains an important goal in being able to predict the aging process in polymer materials. Nuclear magnetic resonance (NMR) spectroscopy has previously been utilized to investigate polymer degradation, including both proton ({sup 1}H) and carbon ({sup 13}C) studies. These previous NMR studies, as well as other spectroscopic investigations, are complicated by the almost overwhelming signal arising from the native undegraded polymer. This makes the identification and quantification of degradation species at small concentrations difficult. In this note we discuss recent investigation into the use of oxygen ({sup 17}O) NMR spectroscopy to probe the oxidative ... continued below

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5 p.

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Alam, T.M.; Click, C.A. & Assink, R.A. September 1, 1997.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM (United States)
    Place of Publication: Albuquerque, New Mexico

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Understanding the mechanism of oxidative degradation remains an important goal in being able to predict the aging process in polymer materials. Nuclear magnetic resonance (NMR) spectroscopy has previously been utilized to investigate polymer degradation, including both proton ({sup 1}H) and carbon ({sup 13}C) studies. These previous NMR studies, as well as other spectroscopic investigations, are complicated by the almost overwhelming signal arising from the native undegraded polymer. This makes the identification and quantification of degradation species at small concentrations difficult. In this note we discuss recent investigation into the use of oxygen ({sup 17}O) NMR spectroscopy to probe the oxidative degradation process in polymers at a molecular level. Due to the low natural abundance (0.037%) and a nuclear spin of I=5/2 possessing an appreciable quadrupolar moment, the use of {sup 17}O NMR in polymer investigations has been limited. By utilizing synthetically enriched oxygen gas during the accelerated aging process, both the difficulties of low natural abundance and background interference signals are eliminated. For enriched samples {sup 17}O NMR spectra now provide a unique probe since all of the observed NMR resonances are the direct result of oxidative degradation.

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5 p.

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OSTI as DE98000194

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  • 21. aging, compatibility, and stockpile stewardship conference, Albuquerque, NM (United States), 30 Sep - 2 Oct 1997

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  • Other: DE98000194
  • Report No.: SAND--97-2122C
  • Report No.: CONF-970982--
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 634892
  • Archival Resource Key: ark:/67531/metadc694663

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  • September 1, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • April 14, 2016, 6:36 p.m.

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Alam, T.M.; Click, C.A. & Assink, R.A. Probing oxidative degradation in polymers using {sup 17}O NMR spectroscopy, article, September 1, 1997; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc694663/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.