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Study of reaction kinetics in the aging of natural rubber by infrared spectrography. II. Effect of light and antioxidants

V. Kellö and A. Tkáč

Slovak Technical University, Bratislava

 

Abstract: cf. C.A. 48, 6153cd. Reaction charts showing the relation of C.dbd.O groups to the time of exposure to infrared light were studied. Bz2O2, phenyl-2-naphthylamine, ο-nitrophenol, m-nitrophenol, p-nitrophenol, 1,2,4-dinitrophenol, ο-aminophenol, benzoquinone, quinhydrone, hydroquinone, pyrogallol, Ni diethyldithiocarbamate, benzidine, urea, thiourea, and thyroxine were divided into inhibitors, retarders, and initiators of oxidation. A study of p-benzoquinone, quinhydrone, hydroquinone, and pyrogallol shows that the antioxidant effect is in close relation with the oxidation-reduction potential system:rubber-O-antioxidant. The natural antioxidants and natural oxidation catalysts present in raw rubber form a natural oxidation-reduction system which dets. the qualities of natural raw rubber. The results of spectrographic measurements show that antioxidants participate directly on the reaction mechanism, and that the most important factor is the rapidity of formation of free radicals and their reaction with other radicals and neutral mols.

Full paper in Portable Document Format: 77a385.pdf (in Slovak)

 

Chemical Papers 7 (7) 385–408 (1953)

Tuesday, May 28, 2024

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