Geopolymers
Inorganic polymeric new materials
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Emma Chiavaro
Emma Chiavaro
Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, Parco Area delle Scienze 181/A, I-43124, Parma, Italy
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Lorenzo Cerretani
Lorenzo Cerretani
Dipartimento di Economia e Ingegneria Agrarie, Università di Bologna, p.zza Goidanich 60, I-47521, Cesena, FC, Italy
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Maria Paciulli
Maria Paciulli
Dipartimento di Ingegneria Industriale, Università degli Studi di Parma, Parco Area delle Scienze 181/A, I-43124, Parma, Italy
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Stefano Vecchio
Stefano Vecchio
Dipartimento di Scienze di Base e Applicate all’Ingegneria, via del Castro Laurenziano 7, I-00185, Rome, Italy
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Abstract
In this study, accelerated storage tests were carried out at 60 °C up to 20 weeks on three extra virgin olive oils (Evoos) with different total phenol contents and fatty acid compositions (named as EvooA, EvooB, and EvooC). Their oxidative statuses, evaluated by means of primary oxidation value and total phenolic content, were related to both the shapes of differential scanning calorimetry (DSC) cooling curves and thermal properties. DSC cooling curves were all deconvoluted as crystallization occurs in a quite narrow range, and the single steps are not well separated. The first deconvoluted DSC peak for the three samples tested, which occurs in the temperature interval between −45 °C and −30 °C, can probably be ascribable to the crystallization of tri-unsaturated triacylglycerols. A non-isothermal crystallization kinetic procedure, derived by the well-known isothermal Avrami equation, combined with the method of Ozawa, was applied to the first deconvoluted DSC peak only by processing the data related to this DSC peak. Results of the modified Avrami method were found in agreement with those of the Ozawa method. In particular, Avrami and Ozawa's exponents lie from 2 to 4 (being those of fresh samples always lower than those subjected to the accelerated oxidation test). Crystallization is relatively slow for fresh samples whereas after the first 4 weeks; it occurs faster in EvooB and EvooC.
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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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