Aging mechanisms in RTV polysiloxane foams
Abstract
The long-term use of polysiloxane foams requires a good understanding of the diverse factors that may influence their performance. The aim of the present work was to understand the interplay between in-service environments and reactive species that reside in the foams. Two foams (SX358 and S5370) were thermally aged under compressive strain to gauge the onset of compression set, an indicator of degradation. In this study, experiments were performed by either aging the foams in open air containers or in high humidity environments. Our results indicated that foams aged in open air environments exhibited less compression set than when aged in presence of moisture. These results were analyzed in terms of post-curing reactions, hydrolysis and rearrangement of the network, which are promoted by active residues that are left in the foam from the curing process. In particular, the residues from tin octoate, the catalyst used in the cure of the foams, were identified and their role in promoting aging was determined. Reactions were either catalyzed by tin(II) species or by a combination of trace amounts of water and octanoic acid, a product of the hydrolysis of tin octoate. More precisely, this work demonstrated that reactive residues promote chemical changes inmore »
- Authors:
-
[1];
[1];
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Honeywell FM&T, Kansas City, MO (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1467319
- Alternate Identifier(s):
- OSTI ID: 1245274
- Report Number(s):
- LA-UR-15-23317
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: 121; Journal Issue: C; Journal ID: ISSN 0141-3910
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Polysiloxanes; Hydrolysis; Stress relaxation; RTV foams; Tin octoate; Octanoic acid
Citation Formats
Labouriau, Andrea, Robison, Tom, Meincke, Linda Jeanne, Wrobleski, Debra, Taylor, Raymond Dean, and Gill, John T. Aging mechanisms in RTV polysiloxane foams. United States: N. p., 2015.
Web. doi:10.1016/j.polymdegradstab.2015.08.013.
Labouriau, Andrea, Robison, Tom, Meincke, Linda Jeanne, Wrobleski, Debra, Taylor, Raymond Dean, & Gill, John T. Aging mechanisms in RTV polysiloxane foams. United States. https://doi.org/10.1016/j.polymdegradstab.2015.08.013
Labouriau, Andrea, Robison, Tom, Meincke, Linda Jeanne, Wrobleski, Debra, Taylor, Raymond Dean, and Gill, John T. Mon .
"Aging mechanisms in RTV polysiloxane foams". United States. https://doi.org/10.1016/j.polymdegradstab.2015.08.013. https://www.osti.gov/servlets/purl/1467319.
@article{osti_1467319,
title = {Aging mechanisms in RTV polysiloxane foams},
author = {Labouriau, Andrea and Robison, Tom and Meincke, Linda Jeanne and Wrobleski, Debra and Taylor, Raymond Dean and Gill, John T.},
abstractNote = {The long-term use of polysiloxane foams requires a good understanding of the diverse factors that may influence their performance. The aim of the present work was to understand the interplay between in-service environments and reactive species that reside in the foams. Two foams (SX358 and S5370) were thermally aged under compressive strain to gauge the onset of compression set, an indicator of degradation. In this study, experiments were performed by either aging the foams in open air containers or in high humidity environments. Our results indicated that foams aged in open air environments exhibited less compression set than when aged in presence of moisture. These results were analyzed in terms of post-curing reactions, hydrolysis and rearrangement of the network, which are promoted by active residues that are left in the foam from the curing process. In particular, the residues from tin octoate, the catalyst used in the cure of the foams, were identified and their role in promoting aging was determined. Reactions were either catalyzed by tin(II) species or by a combination of trace amounts of water and octanoic acid, a product of the hydrolysis of tin octoate. More precisely, this work demonstrated that reactive residues promote chemical changes in the polymer, which resulted in compression set. On the other hand, the oxidized residues of the tin octoate show no catalytic activity towards promoting condensation reactions between silanol groups. In conclusion, our work established that, depending on service conditions, certain residues are more harmful to the foam's lifetime than others.},
doi = {10.1016/j.polymdegradstab.2015.08.013},
journal = {Polymer Degradation and Stability},
number = C,
volume = 121,
place = {United States},
year = {Mon Aug 24 00:00:00 EDT 2015},
month = {Mon Aug 24 00:00:00 EDT 2015}
}
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Works referencing / citing this record:
Development of mechanically durable hydrophobic lanolin/silicone rubber coating on viscose fibers
journal, September 2019
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