Some chemical effects in fatigue cracking of vulcanized rubbers

Authors

  • A. N. Gent

    1. The National Rubber Producer's Research Association, Welwyn Garden City, Herts., England
    Current affiliation:
    1. The Institute of Rubber Research, University of Akron, Akron, Ohio
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Abstract

An apparatus is described for studying the fatigue of rubber strips under repeated simple extensions in different atmospheres. The fatigue life is shown to be greatly increased in vacuo for vulcanizates of natural rubber and SBR. The effect of oxidation inhibitors and radical acceptors has been examined; they are found to prolong the life in air, but have little effect in vacuo. The results suggest that a substantial proportion of crack growth in air is due to oxidative deterioration of the rubber at the crack tip, probably initiated by mechanical rupture.

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