Geopolymers
Inorganic polymeric new materials
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Andrei Jitianu
Andrei Jitianu
Department of Chemistry, Lehman College, City University of New York, Davis Hall, 250 Bedford Park Boulevard West, Bronx, NY, USA, 10468
Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ, 08854, USA
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Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ, 08854, USA
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Kristin Lammers
Kristin Lammers
Department of Chemistry, Rutgers University, Camden, NJ, 08102, USA
Department of Chemistry, Temple University, Philadelphia, PA, 19122, USA
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Department of Chemistry, Temple University, Philadelphia, PA, 19122, USA
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Georgia A. Arbuckle-Kiel
Georgia A. Arbuckle-Kiel
Department of Chemistry, Rutgers University, Camden, NJ, 08102, USA
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Lisa C. Klein
Lisa C. Klein
Department of Materials Science and Engineering, Rutgers University, 607 Taylor Road, Piscataway, NJ, 08854, 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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| Journal of Thermal Analysis and Calorimetry | |
|---|---|
| Language | English |
| Size | A4 |
| Year of Foundation |
1969 |
| Volumes per Year |
1 |
| Issues per Year |
24 |
| Founder | Akadémiai Kiadó |
| Founder's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. |
| Publisher | Akadémiai Kiadó Springer Nature Switzerland AG |
| Publisher's Address |
H-1117 Budapest, Hungary 1516 Budapest, PO Box 245. CH-6330 Cham, Switzerland Gewerbestrasse 11. |
| Responsible Publisher |
Chief Executive Officer, Akadémiai Kiadó |
| ISSN | 1388-6150 (Print) |
| ISSN | 1588-2926 (Online) |
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Temperature dependence of the rate of reaction in thermal analysis
The Arrhenius equation in condensed phase kinetics
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