Geopolymers
Inorganic polymeric new materials
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Sulene Araújo
Sulene Araújo
State University of Southwest of Bahia (UESB) Department of Chemistry Jequie BA 45206-190 Brazil
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Antonio Araujo
Antonio Araujo
Federal University of Rio Grande do Norte Department of Chemistry Natal RN 59078-970 Brazil
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Nedja Fernandes
Nedja Fernandes
Federal University of Rio Grande do Norte Department of Chemistry Natal RN 59078-970 Brazil
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Valter Fernandes
Valter Fernandes
Federal University of Rio Grande do Norte Department of Chemistry Natal RN 59078-970 Brazil
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Massao Ionashiro
Massao Ionashiro
UNESP Institute of Chemistry CP 355 Araraquara SP 14801-970 Brazil
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Abstract
The aim of this work is to determine the activation energy for the thermal decomposition of poly(ethylene terephthalate)—PET, in the presence of a MCM-41 mesoporous catalyst. This material was synthesized by the hydrothermal method, using cetyltrimethylammonium as template. The PET sample has been submitted to thermal degradation alone and in presence of MCM-41 catalyst at a concentration of 25% in mass (MCM-41/PET). The degradation process was evaluated by thermogravimetry, at temperature range from 350 to 500 °C, under nitrogen atmosphere, with heating rates of 5, 10 and 25 °C min−1. From TG, the activation energy, determined using the Flynn–Wall kinetic method, decreased from 231 kJ mol−1, for the pure polymer (PET), to 195 kJ mol−1, in the presence of the material (MCM-41/PET), showing the catalyst efficiency for the polymer decomposition process.
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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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