Geopolymers
Inorganic polymeric new materials
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J. M. Morancho
J. M. Morancho
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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A. Cadenato
A. Cadenato
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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X. Ramis
X. Ramis
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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X. Fernández-Francos
X. Fernández-Francos
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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M. Flores
M. Flores
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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J. M. Salla
J. M. Salla
Laboratori de Termodinàmica, Departament de Màquines i Motors Tèrmics, ETSEIB, Universitat Politècnica de Catalunya, Diagonal 647, 08028, Barcelona, Spain
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Abstract
In this study, the authors study by calorimetry the influence of hyperbranched polyester Boltron®H40 on the thermal curing and the photocuring of a diglycidyl ether of bisphenol epoxy resin (DGEBA) using ytterbium (III) trifluoromethanesulfonate and triarylsulfonium hexafluorantimonate as thermal and photo cationic initiators, respectively. In the dynamic thermal curing at different heating rates, the authors have seen a decelerating effect when H40 is added to DGEBA, the system with 10% of H40 being the slowest. An isoconversional method has been used to determine the apparent activation energy of the thermal curing. In the isothermal photocuring at low temperatures, the authors have also appreciated a decelerating effect on adding H40, obtaining a minimum conversion when the H40 proportion is 15%. However, at high temperatures, the photocuring process can be accelerated at the first part of this process. This behavior is a consequence of the temperature dependence of H40 solubility in DGEBA, the viscosity of the system, and the hydroxyl-induced chain-transfer reaction. The values found of the maximum glass transition temperature in the thermal curing and in the photocuring, show that H40 is not completely solubilized in the reacted system.
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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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