Authors:
Z. Cibulková Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology Radlinského 9, 812 37 Bratislava, Slovak Republic

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P. Šimon Department of Physical Chemistry, Faculty of Chemical and Food Technology, Slovak University of Technology Radlinského 9, 812 37 Bratislava, Slovak Republic

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P. Lehocký Research Institute of Chemical Technology Nobelova 34, 836 03 Bratislava, Slovak Republic

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J. Balko Research Institute of Chemical Technology Nobelova 34, 836 03 Bratislava, Slovak Republic

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Summary The antioxidant activity of selected N,N'-substituted p-phenylenediamines derived from 6PPD in polyisoprene matrix has been studied by differential scanning calorimetry (DSC) under non-isothermal conditions. The kinetic parameters describing temperature dependence of induction period have been obtained. Protection factors and antioxidant effectiveness have been calculated to characterize the stabilizing effect of the antioxidants under study. Using both criteria, the highest antioxidant activity has been observed in the case of Dusantox L, which is a mixture of 6PPD and its p-kumyl derivative. Its high antioxidant efficiency can be explained by the synergistic effect of 6PPD and its p-kumyl derivative. The lowest antioxidant efficiency of o-kumylderivative of 6PPD is probably caused by the sterical effect of the bulky kumyl group.

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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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