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  • 1 West University of Timişoara, Research Center for Thermal Analysis in Environmental Problems, Pestalozzi Street 16, 300115, Timisoara, Romania
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Abstract

A flexible polyurethane (PU) foam prepared from a polyol and an isocyanate prepolymer was stabilized against thermooxidation with two types of compounds: 2,6-di-t-butyl-4-methyl-phenol (non-reactive) and, respectively, 3,5-di-t-butyl-4-hidroxy-benzyl alcohol (reactive). The TG were obtained at different heating rates: β = 5, 7, 10, and 12 °C min−1 and the TG/DTG were processed with the following methods: Freidman, Flynn–Wall–Ozawa, Budrugeac–Segal, and, respectively, Non-Parametric Kinetics. By Freidman and Flynn–Wall–Ozawa methods it was observed a significant (more that 10%) variation of the activation energy, E, versus the conversion degree, this being an indication of a complex process. Therefore, the more sophisticated Budrugeac–Segal and NPK methods were used. The Budrugeac–Segal method presents a very good descriptive ability, so it is useful for simulations of the thermal behavior. The NPK method is the less speculative one and in the majority of cases the obtained values of the activation energy were in a rather good agreement with both Friedman and Flynn–Wall–Ozawa kinetic data. The value of the activation energy seems to be an appropriate parameter for the estimation of the thermal stability. In comparison with the unstabilized PU, the one stabilized with the reactive compound presented the best thermal stability

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  • Scimago Journal Rank (2019): 0.415
  • SJR Hirsch-Index (2019): 87
  • SJR Quartile Score (2019): Q3 Condensed Matter Physics
  • SJR Quartile Score (2019): Q3 Physical and Theoretical Chemistry
  • Impact Factor (2018): 2.471
  • Scimago Journal Rank (2018): 0.634
  • SJR Hirsch-Index (2018): 78
  • SJR Quartile Score (2018): Q2 Condensed Matter Physics
  • SJR Quartile Score (2018): Q2 Physical and Theoretical Chemistry

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Journal of Thermal Analysis and Calorimetry
Language English
Size A4
Year of
Foundation
1969
Volumes
per Year
4
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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