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Studies were conducted of the stabilizing effect of dialkyl derivatives of pyrocatechol types I–III and 2‐alkoxyphenol types IV and V in polypropylene irradiated under vacuum with a dose of 110 or 228 Mrad. It was found that some derivatives, particularly those containing a bulky tertiary butyl group in o the position to the hydroxyl group, retard the destruction of the polymer and formation of crosslinks, protecting at the same time irradiated polypropylene against subsequent oxidation. In the studied series of pyrocatechol derivatives the structural dependencies are well visible although the interpretation of results is probably also affected by the direct action of γ‐radiation on the stabilizers.

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