TY - GEN
T1 - Methyl-modified melting gels for hermetic barrier coatings
AU - Jitianu, Andrei
AU - Doyle, John
AU - Amatucci, Glenn
AU - Klein, Lisa C.
PY - 2008
Y1 - 2008
N2 - Organically-modified silica gels prepared by the sol-gel method are called "melting gels" when they show the behavior that they are rigid at room temperature, but soften and re-soften at temperatures in the range 100-120°C. Melting gels can be used to form glass seals at temperatures lower than conventional, all-inorganic glasses. Unlike most sol-gel glasses, melting gels are nonporous. After consolidation at > 135°C, melting gels no longer re-soften. In this study, melting gels were prepared using methyltriethoxysilane (MTES) and dimethyldiethoxysilane (DMDES), with five compositions between 50 mol% MTES-50 mol% DMDES and 75 mol% MTES-25 mol% DMDES. Thermal gravimetric analysis and differential scanning calorimetry were performed, along with FT-IR and Raman spectroscopic analyses. A helium leak test was performed and the measured helium transmission rate was ̃8.6 10 -5 cm3/day. In addition, 5x5 cm2 foil envelopes were filled with an organic electrolyte and sealed with melting gel. The envelopes were stored for 3 weeks at 70°C, and the measured weight loss was less than 1%.
AB - Organically-modified silica gels prepared by the sol-gel method are called "melting gels" when they show the behavior that they are rigid at room temperature, but soften and re-soften at temperatures in the range 100-120°C. Melting gels can be used to form glass seals at temperatures lower than conventional, all-inorganic glasses. Unlike most sol-gel glasses, melting gels are nonporous. After consolidation at > 135°C, melting gels no longer re-soften. In this study, melting gels were prepared using methyltriethoxysilane (MTES) and dimethyldiethoxysilane (DMDES), with five compositions between 50 mol% MTES-50 mol% DMDES and 75 mol% MTES-25 mol% DMDES. Thermal gravimetric analysis and differential scanning calorimetry were performed, along with FT-IR and Raman spectroscopic analyses. A helium leak test was performed and the measured helium transmission rate was ̃8.6 10 -5 cm3/day. In addition, 5x5 cm2 foil envelopes were filled with an organic electrolyte and sealed with melting gel. The envelopes were stored for 3 weeks at 70°C, and the measured weight loss was less than 1%.
KW - Hermetic barrier, Sol-gel, Hybrid organic-inorganic
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M3 - Conference contribution
AN - SCOPUS:63749090532
SN - 9781605606217
T3 - Materials Science and Technology Conference and Exhibition, MS and T'08
SP - 2171
EP - 2182
BT - Materials Science and Technology Conference and Exhibition MS and T'08
T2 - Materials Science and Technology Conference and Exhibition, MS and T'08
Y2 - 5 October 2008 through 9 October 2008
ER -