Analysis of Hydroperoxides in solid Polyethylene by NMR and EPR Spectroscopy

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The authors have shown that the hydroperoxide species in {gamma}-irradiated {sup 13}C-polyethylene can be directly observed by {sup 13}C MAS NMR spectroscopy. The experiment was performed without the need for special sample preparation such as chemical derivatization or dissolution. Annealing experiments were employed to study the thermal decomposition of the hydroperoxide species and to measure an activation energy of 98 kJ/mol. EPR spectroscopy suggests that residual polyenyl and alkylperoxy radicals are predominantly trapped in interracial or crystalline regions, while the peroxy radicals observed after UV-photolysis of hydroperoxides are in amorphous regions.

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3 p.

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ASSINK,ROGER A.; CELINA,MATHIAS C.; DUNBAR,TIMOTHY D.; ALAM,TODD M.; CLOUGH,ROGER LEE & GILLEN,KENNETH T. June 12, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA
    Place of Publication: Albuquerque, New Mexico

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Description

The authors have shown that the hydroperoxide species in {gamma}-irradiated {sup 13}C-polyethylene can be directly observed by {sup 13}C MAS NMR spectroscopy. The experiment was performed without the need for special sample preparation such as chemical derivatization or dissolution. Annealing experiments were employed to study the thermal decomposition of the hydroperoxide species and to measure an activation energy of 98 kJ/mol. EPR spectroscopy suggests that residual polyenyl and alkylperoxy radicals are predominantly trapped in interracial or crystalline regions, while the peroxy radicals observed after UV-photolysis of hydroperoxides are in amorphous regions.

Physical Description

3 p.

Notes

INIS; OSTI as DE00760049

Medium: P; Size: 3 pages

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  • American Chemical Society National Meeting, San Francisco, CA (US), 03/26/2000--03/30/2000

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  • Report No.: SAND99-2819C
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 760049
  • Archival Resource Key: ark:/67531/metadc723380

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  • June 12, 2000

Added to The UNT Digital Library

  • Sept. 29, 2015, 5:31 a.m.

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  • April 10, 2017, 7:19 p.m.

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ASSINK,ROGER A.; CELINA,MATHIAS C.; DUNBAR,TIMOTHY D.; ALAM,TODD M.; CLOUGH,ROGER LEE & GILLEN,KENNETH T. Analysis of Hydroperoxides in solid Polyethylene by NMR and EPR Spectroscopy, article, June 12, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc723380/: accessed August 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.