ゴムのオゾンき裂の機構-実験-

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In this paper, we discussed the relation between the theoretical consideration of the mechanism of ozone cracking on rubber surface (as it had mentioned in Part I1) previously, ) and its experimental results.Observing the surface change of unstrained and strained rubbers exposed in the ozonized air by electromicroscopy, we noticed that the surfaces of unstrained rubbers were covered with the stable oxidized films and however, on the surfaces of strained rubbers the ozone cracks grew.On the other hand, we succeeded in showing experimentally that migration of the anti-ozonants to rubber surface was related to their ozone-resistance properties.Then, from these facts we showed that it is possible to explain how the shapes of ozone cracks varied with the ozone concentration and amount of stress given on rubber specimens, by applying the theoretical consideration mentioned in Part I and furthermore, by introducing the concepts of the stress relaxation of rubber surfaces.The experimental results like the reation between elongation ratio of rubbers and the time until cracks occur, the effects of softeners, and the effects of concentration of ozone and anti-ozonants were consistent with the results of the theoretical consideration mentioned in Part I.
日本ゴム協会の論文