Stabilisierung von Polypropylen durch Mischungen substituierter Phenole und Di-n-alkylsulfide

This paper is dealing with the synergistic effect of some phenolic antioxidants, e.g. 4,4′-butylidene-bis(3-methyl-6-tert.-butylphenol), 2,2′methylidene-bis(4-methyl-6-tert.-butylphenol) and 4,4′-thio-bis(3-methyl-6-tert.-butylphenol) with di-n-alkylsulfides of various chain lengths and of sulphoxides and sulphones of the latter on the induction period of oxidation of polypropylene. The influence of the type of the phenolic antioxidants in the mixtures of stabilizers, the influence of the length of the alkyl chain of the sulphide component and the influence of the temperature was studied. Because an interaction between the mentioned substances and the formed peroxides during the inhibition of polypropylene in the presence of sulphides and their derivates was considered, the effect of sulphides, sulphoxides and sulphones on the decomposition of tert.-butyl hydroperoxides was studied.