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Title: Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers [Investigation of moisture outgassing kinetics of polydimethylsiloxane polymers filled with hydrophobic silica filler]

Abstract

The outgassing kinetics from siloxane elastomers is dominated by moisture desorption from the reinforcing silica filler and can be detrimental in moisture-sensitive applications. In this study, a custom 3D printable siloxane rubber (LL50) was analyzed in three different states: after a high temperature vacuum heat treatment, limited re-exposure to moisture after vacuum heat treatment, and in the as-received condition. The outgassing kinetics were extracted using isoconversional and iterative regression analyses. Moisture release by physisorbed and chemisorbed water from the samples have activation energies in the range of 50 kJ/mol (physisorbed type) to 220 kJ/mol (chemisorbed type). Overall, moisture outgassing from LL50 was 10 times lower than that from traditionally prepared siloxane rubbers. Finally, the vastly diminished moisture content in LL50 is attributed to the existence of a finite low level of silanol groups that remain on the fumed silica surface even after hydrophobic treatment.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1525736
Report Number(s):
LLNL-JRNL-751219
Journal ID: ISSN 2397-2106; 936392
Grant/Contract Number:  
AC52-07NA27344
Resource Type:
Accepted Manuscript
Journal Name:
npj Materials Degradation
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2397-2106
Publisher:
Springer
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Sharma, Hom N., Lenhardt, Jeremy M., Loui, Albert, Allen, Patrick G., McLean, William, Maxwell, Robert S., and Dinh, Long N. Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers [Investigation of moisture outgassing kinetics of polydimethylsiloxane polymers filled with hydrophobic silica filler]. United States: N. p., 2019. Web. doi:10.1038/s41529-019-0083-4.
Sharma, Hom N., Lenhardt, Jeremy M., Loui, Albert, Allen, Patrick G., McLean, William, Maxwell, Robert S., & Dinh, Long N. Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers [Investigation of moisture outgassing kinetics of polydimethylsiloxane polymers filled with hydrophobic silica filler]. United States. doi:10.1038/s41529-019-0083-4.
Sharma, Hom N., Lenhardt, Jeremy M., Loui, Albert, Allen, Patrick G., McLean, William, Maxwell, Robert S., and Dinh, Long N. Fri . "Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers [Investigation of moisture outgassing kinetics of polydimethylsiloxane polymers filled with hydrophobic silica filler]". United States. doi:10.1038/s41529-019-0083-4. https://www.osti.gov/servlets/purl/1525736.
@article{osti_1525736,
title = {Moisture outgassing from siloxane elastomers containing surface-treated-silica fillers [Investigation of moisture outgassing kinetics of polydimethylsiloxane polymers filled with hydrophobic silica filler]},
author = {Sharma, Hom N. and Lenhardt, Jeremy M. and Loui, Albert and Allen, Patrick G. and McLean, William and Maxwell, Robert S. and Dinh, Long N.},
abstractNote = {The outgassing kinetics from siloxane elastomers is dominated by moisture desorption from the reinforcing silica filler and can be detrimental in moisture-sensitive applications. In this study, a custom 3D printable siloxane rubber (LL50) was analyzed in three different states: after a high temperature vacuum heat treatment, limited re-exposure to moisture after vacuum heat treatment, and in the as-received condition. The outgassing kinetics were extracted using isoconversional and iterative regression analyses. Moisture release by physisorbed and chemisorbed water from the samples have activation energies in the range of 50 kJ/mol (physisorbed type) to 220 kJ/mol (chemisorbed type). Overall, moisture outgassing from LL50 was 10 times lower than that from traditionally prepared siloxane rubbers. Finally, the vastly diminished moisture content in LL50 is attributed to the existence of a finite low level of silanol groups that remain on the fumed silica surface even after hydrophobic treatment.},
doi = {10.1038/s41529-019-0083-4},
journal = {npj Materials Degradation},
number = 1,
volume = 3,
place = {United States},
year = {2019},
month = {5}
}

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