Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer
Abstract
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 gammamore »
- Authors:
-
- 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.
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1329567
- Alternate Identifier(s):
- OSTI ID: 1245280
- Report Number(s):
- LA-UR-15-21100
Journal ID: ISSN 0141-3910
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Polymer Degradation and Stability
- Additional Journal Information:
- Journal Volume: 116; Journal ID: ISSN 0141-3910
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; PDMS, irradiation; oxidative degradation; radiolysis
Citation Formats
Labouriau, Andrea, Cady, Carl Mcelhinney, Gill, John T., Stull, Jamie Ann, Ortiz-Acosta, Denisse, Henderson, Kevin C., Hartung, Vaughn, Quintana, Adam, and Celina, Mathew C. Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer. United States: N. p., 2015.
Web. doi:10.1016/j.polymdegradstab.2015.03.009.
Labouriau, Andrea, Cady, Carl Mcelhinney, Gill, John T., Stull, Jamie Ann, Ortiz-Acosta, Denisse, Henderson, Kevin C., Hartung, Vaughn, Quintana, Adam, & Celina, Mathew C. Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer. United States. https://doi.org/10.1016/j.polymdegradstab.2015.03.009
Labouriau, Andrea, Cady, Carl Mcelhinney, Gill, John T., Stull, Jamie Ann, Ortiz-Acosta, Denisse, Henderson, Kevin C., Hartung, Vaughn, Quintana, Adam, and Celina, Mathew C. Sat .
"Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer". United States. https://doi.org/10.1016/j.polymdegradstab.2015.03.009. https://www.osti.gov/servlets/purl/1329567.
@article{osti_1329567,
title = {Gamma Irradiation and Oxidative Degradation of a Silica-Filled Silicone Elastomer},
author = {Labouriau, Andrea and Cady, Carl Mcelhinney and Gill, John T. and Stull, Jamie Ann and Ortiz-Acosta, Denisse and Henderson, Kevin C. and Hartung, Vaughn and Quintana, Adam and Celina, Mathew C.},
abstractNote = {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.},
doi = {10.1016/j.polymdegradstab.2015.03.009},
journal = {Polymer Degradation and Stability},
number = ,
volume = 116,
place = {United States},
year = {Sat Mar 21 00:00:00 EDT 2015},
month = {Sat Mar 21 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Dielectric and Carrier Transport Properties of Silicone Rubber Degraded by Gamma Irradiation
journal, October 2017
- Min, Daomin; Yan, Chenyu; Huang, Yin
- Polymers, Vol. 9, Issue 12
Experimental investigation of the degradation mechanism of silicone rubber exposed to heat and gamma rays
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Inorganic fillers influence on the radiation-induced ageing of a space-used silicone elastomer
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