Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer

Labouriau, Andrea; Cady, Carl Mcelhinney; Gill, John T.; Stull, Jamie Ann; Ortiz-Acosta, Denisse; Henderson, Kevin C.; Hartung, Vaughn; Quintana, Adam; Celina, Mathew C.

doi:10.1016/j.polymdegradstab.2015.03.009

Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer

Journal Article · Sat Mar 21 00:00:00 EDT 2015 · Polymer Degradation and Stability

DOI:https://doi.org/10.1016/j.polymdegradstab.2015.03.009· OSTI ID:1329567

Labouriau, Andrea ^[1]; Cady, Carl Mcelhinney ^[2]; Gill, John T. ^[1]; Stull, Jamie Ann ^[2]; Ortiz-Acosta, Denisse ^[1]; Henderson, Kevin C. ^[2]; Hartung, Vaughn ^[2]; Quintana, Adam ^[3]; Celina, Mathew C. ^[3]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Chemical Diagnostic and Engineering
Los Alamos National Lab. (LANL), Los Alamos, NM (United States). Division of Materials Science and Technology
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Materials Characterization and Performance Dept.

The radiation oxidative degradation of a commonly used silica-filled silicone elastomer DC745 was investigated by a series of experimental techniques. This elastomer is known to be chemically and thermally stable, but insufficient data exist on the radiation resistance. In the present work, gamma doses up to 200 kGy were applied under air at RT and 1Gy/s. Radiation chemical changes were investigated by NMR, FT-IR, Raman, and mass spectroscopy. DSC and TGA experiments probed thermal transitions and thermal stability changes with exposure dose. SEM probed variations on the surface of the elastomer, and solvent swelling methods were used to investigate changes in the polymer network properties. Electron paramagnetic resonance was employed to detect and identify free radicals. Uniaxial compression load tests at variable temperatures were performed to assess changes in the material’s mechanical response as a function of radiation dose. Results demonstrate that, with increasing exposure, DC745 undergoes changes in chemistry that lead to an increase in thermal stability and cross-link density, formation of free radical species, decrease in heat of fusion and increase in stiffness at low temperatures. Taken together, these results indicate that oxidative cross-linking is the dominant radiolysis mechanism that occurs when this material is exposed to gamma irradiation in air at high dose rates.

View Accepted Manuscript (DOE)

Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1329567

Alternate ID(s):: OSTI ID: 1245280

Report Number(s):: LA-UR-15--21100

Journal Information:: Polymer Degradation and Stability, Journal Name: Polymer Degradation and Stability Vol. 116; ISSN 0141-3910

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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