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Title: The effects of gamma irradiation on RTV polysiloxane foams

The present paper involves the investigation of ionizing radiation effects on silica filled poly (dimethyl siloxane) foam vulcanized at room temperature. In order to better predict aging effects in these materials, it is important to understand the influence of irradiation on structural-rheological property relationships. Polysiloxane foams were subjected to moderate doses of gamma irradiation in an inert atmosphere and characterized by thermal (DSC and TGA), chemical (FT-IR, NMR, Mössbauer, mass spectroscopy, EPR, solvent swelling), microscopy (SEM and AFM), and mechanical (uniaxial compressive load) techniques. Radiation exposure induced cross-linking reactions that predominated over chain scission reactions for the dose range investigated. No long-lived radiation-induced radicals were detected and the porous structure of the irradiated foam remained unchanged. Finally, radiation exposure resulted in gas evolution, decrease in crystallization levels, slight changes in chemistry, and decrease in the molecular weight between cross-links, thereby hardening the foam.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Report Number(s):
LA-UR-14-28787
Journal ID: ISSN 0141-3910
Grant/Contract Number:
AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Polymer Degradation and Stability
Additional Journal Information:
Journal Volume: 117; Journal ID: ISSN 0141-3910
Publisher:
Elsevier
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; polysiloxanes, gamma irradiation, RTV, foams
OSTI Identifier:
1467363
Alternate Identifier(s):
OSTI ID: 1245238

Labouriau, Andrea, Cady, Carl, Gill, John, Taylor, Dean, Zocco, Adam, Stull, Jamie, Henderson, Kevin, and Wrobleski, Debra. The effects of gamma irradiation on RTV polysiloxane foams. United States: N. p., Web. doi:10.1016/j.polymdegradstab.2015.03.021.
Labouriau, Andrea, Cady, Carl, Gill, John, Taylor, Dean, Zocco, Adam, Stull, Jamie, Henderson, Kevin, & Wrobleski, Debra. The effects of gamma irradiation on RTV polysiloxane foams. United States. doi:10.1016/j.polymdegradstab.2015.03.021.
Labouriau, Andrea, Cady, Carl, Gill, John, Taylor, Dean, Zocco, Adam, Stull, Jamie, Henderson, Kevin, and Wrobleski, Debra. 2015. "The effects of gamma irradiation on RTV polysiloxane foams". United States. doi:10.1016/j.polymdegradstab.2015.03.021. https://www.osti.gov/servlets/purl/1467363.
@article{osti_1467363,
title = {The effects of gamma irradiation on RTV polysiloxane foams},
author = {Labouriau, Andrea and Cady, Carl and Gill, John and Taylor, Dean and Zocco, Adam and Stull, Jamie and Henderson, Kevin and Wrobleski, Debra},
abstractNote = {The present paper involves the investigation of ionizing radiation effects on silica filled poly (dimethyl siloxane) foam vulcanized at room temperature. In order to better predict aging effects in these materials, it is important to understand the influence of irradiation on structural-rheological property relationships. Polysiloxane foams were subjected to moderate doses of gamma irradiation in an inert atmosphere and characterized by thermal (DSC and TGA), chemical (FT-IR, NMR, Mössbauer, mass spectroscopy, EPR, solvent swelling), microscopy (SEM and AFM), and mechanical (uniaxial compressive load) techniques. Radiation exposure induced cross-linking reactions that predominated over chain scission reactions for the dose range investigated. No long-lived radiation-induced radicals were detected and the porous structure of the irradiated foam remained unchanged. Finally, radiation exposure resulted in gas evolution, decrease in crystallization levels, slight changes in chemistry, and decrease in the molecular weight between cross-links, thereby hardening the foam.},
doi = {10.1016/j.polymdegradstab.2015.03.021},
journal = {Polymer Degradation and Stability},
number = ,
volume = 117,
place = {United States},
year = {2015},
month = {4}
}