Aging mechanisms in RTV polysiloxane foams

Labouriau, Andrea; Robison, Tom; Meincke, Linda Jeanne; Wrobleski, Debra; Taylor, Raymond Dean; Gill, John T.

doi:10.1016/j.polymdegradstab.2015.08.013

Title: Aging mechanisms in RTV polysiloxane foams

Journal Article · Mon Aug 24 00:00:00 EDT 2015 · Polymer Degradation and Stability

DOI:https://doi.org/10.1016/j.polymdegradstab.2015.08.013· OSTI ID:1467319

^[1]; Robison, Tom ^[2]; Meincke, Linda Jeanne ^[1]; Wrobleski, Debra ^[1];

^[1]; Gill, John T. ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Honeywell FM&T, Kansas City, MO (United States)

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.

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

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

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1467319

Alternate ID(s):: OSTI ID: 1245274

Report Number(s):: LA-UR-15-23317

Journal Information:: Polymer Degradation and Stability, Vol. 121, Issue C; ISSN 0141-3910

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 17 works

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36 MATERIALS SCIENCE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
Polysiloxanes
Hydrolysis
Stress relaxation
RTV foams
Tin octoate
Octanoic acid

Title: Aging mechanisms in RTV polysiloxane foams

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