Analysis of Hydroperoxides in solid Polyethylene by NMR and EPR Spectroscopy

Conference · Mon Jun 12 00:00:00 EDT 2000

OSTI ID:760049

ASSINK, ROGER A; CELINA, MATHIAS C; DUNBAR, TIMOTHY D; ALAM, TODD M; CLOUGH, ROGER LEE; GILLEN, KENNETH T

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.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Sandia National Lab. (SNL-CA), Livermore, CA (United States)
• Sponsoring Organization: US Department of Energy (US)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 760049
• Report Number(s): SAND99-2819C; TRN: US0004688
• Resource Relation: Conference: American Chemical Society National Meeting, San Francisco, CA (US), 03/26/2000--03/30/2000; Other Information: PBD: 12 Jun 2000
• Country of Publication: United States
• Language: English

Related Subjects

38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY
ACTIVATION ENERGY
PEROXY RADICALS
POLYETHYLENES
PEROXIDES
CHEMICAL ANALYSIS
CHEMICAL RADIATION EFFECTS
GAMMA RADIATION