Geopolymers
Inorganic polymeric new materials
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M. Hernández-Escolano
M. Hernández-Escolano
Centre for Biomaterials and Tissue Engineering, Univ. Politec Valencia, C/Ingeniro Fausto Elio S/N, 46021, Valencia, Spain
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X. Ramis
X. Ramis
Laboratory of Thermodynamics, Univ. Politec. Cataluña, Av. Diagonal 647, 08028, Barcelona, Spain
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A. Jiménez-Morales
A. Jiménez-Morales
Universidad Carlos III, Av. Universidad 30, 28911, Leganés, Madrid, Spain
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M. Juan-Díaz
M. Juan-Díaz
Universidad Jaume I, Vicent Sos Baynat, s/n, 12071, Castelló de la Plana, Spain
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J. Suay
J. Suay
Universidad Jaume I, Vicent Sos Baynat, s/n, 12071, Castelló de la Plana, Spain
Centre for Biomaterials and Tissue Engineering, Univ. Politec Valencia, C/Ingeniro Fausto Elio S/N, 46021, Valencia, Spain
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Centre for Biomaterials and Tissue Engineering, Univ. Politec Valencia, C/Ingeniro Fausto Elio S/N, 46021, Valencia, Spain
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Abstract
A set of materials has been prepared by sol–gel process containing different quantities of hydroxyapatite (0, 2.5 and 5% HAp w/w) using as silica precursors glycidyloxypropyltrimethoxysilane (GPTMS) and triethoxyvinylsilane (VTES). In order to optimize the curing process to obtain sintherized systems (inorganic network) or hybrid systems (organic–inorganic) a TG and FTIR studies have been developed and degradation kinetic triplet parameters were obtained (the activation energy, pre-exponential factor, and function of degree of conversion). The kinetic study was analyzed by means of an integral isoconversional non-isothermal procedure (model free), and the kinetic model was determined by the Coats–Redfern method and through the compensation effect (IKR). All the systems followed the n = 6 kinetic model. The addition of HAp increases the thermal stability of the systems. The isothermal degradation was simulated from non-isothermal data, and the curing process could be defined to obtain the two types of materials. Temperature under 250 °C allows the formation of hybrids networks.
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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 |
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| 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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