Thermal analysis of organically modified siloxane melting gels |
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| Authors: | Andrei Jitianu Kristin Lammers Georgia A. Arbuckle-Kiel Lisa C. Klein |
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| Affiliation: | (1) Department of Chemistry, Lehman College, City University of New York, Davis Hall, 250 Bedford Park Boulevard West, Bronx, NY USA, 10468;(2) Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ 08854, USA;(3) Department of Chemistry, Rutgers University, Camden, NJ 08102, USA;(4) Department of Chemistry, Temple University, Philadelphia, PA 19122, USA; |
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| Abstract: | Hybrid melting gels were prepared by a sol–gel process, starting with a mono-substituted siloxane and a di-substituted siloxane, methyltrimethoxysilane (MTES) together with dimethyldimethoxysilane (DMDES). Five gel compositions were prepared with concentrations between 50% MTES–50% DMDES and 75% MTES–25% DMDES (in mol.%). The consolidation temperature, the treatment temperature after which the melting gel no longer softens, increased from 135 to 160 °C with a decrease in the amount of the mono-substituted siloxane. The glass transition temperature, recorded with differential scanning calorimetry, decreased from −0.3 to −56.7 °C with a decrease in the amount of the mono-substituted siloxane. When a sample was heat treated isothermally for 2 h at the consolidation temperature, the glass transition temperature increased by about 15°, indicating further crosslinking of the siloxane network. |
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