Journal of Thermal Analysis and Calorimetry
Volume/Issue:
Volume 94: Issue 2
Thermal behavior of Cd2+ and Co2+ phenyl-vinyl-phosphonates under non-isothermal condition
Authors:
N. Doca West University of Timişoara, Research Center for Thermal Analysis in Environmental Problems Str. Pestalozzi No. 16 Timişoara 300115 Romania

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Gabriela Vlase West University of Timişoara, Research Center for Thermal Analysis in Environmental Problems Str. Pestalozzi No. 16 Timişoara 300115 Romania

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T. Vlase West University of Timişoara, Research Center for Thermal Analysis in Environmental Problems Str. Pestalozzi No. 16 Timişoara 300115 Romania

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G. Ilia Institute of Chemistry Timişoara B-dul M. Viteazul, No. 24 Romania

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Pages:
441–445
Online Publication Date:
13 Nov 2008
Publication Date:
01 Nov 2008
Article Category:
Research Article
DOI:
https://doi.org/10.1007/s10973-008-9347-x
Keywords:
coupled TG-EGA; FTIR spectra; metal phosphonates; non-isothermal kinetics; NPK method
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Abstract  

The thermal behavior of Cd2+ and Co2+ phenyl-vinyl-phosphonates was studied using two different experimental strategies: the coupled TG-EGA (FTIR) technique by decomposition in nitrogen respectively air, and the kinetic analysis of TG data obtained in dynamic air atmosphere at four heating rates. In nitrogen two decomposition steps were observed: the loss of crystallization water, respectively the decomposition of the phenyl-vinyl radical. In air, the same dehydration was observed as the first step, but the second one is a thermooxidation of the organic radical with formation of the pyrophosphoric anion. The kinetic analysis of the TG non-isothermal data was performed by the isoconversional methods suggested by Friedman and Flynn, Wall and Ozawa, as well as by the non-parametric (Sempere-Nomen) method. All processes put in evidence in TG curves exhibit strong changes of the activation energy values with the conversion degree, which mean that these processes are complex ones. Assuming that each of these processes consists in two steps, the application of non-parametric method leads to average values of the activation energy close to the average values of this parameter obtained by isoconversional methods.

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Cover Journal of Thermal Analysis and Calorimetry
Journal of Thermal Analysis and Calorimetry
Print ISSN:
1388-6150
Online ISSN:
1572-8943

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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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