1. It has been shown that the effectiveness of the action of antifatigue agents changes depending on the method of addition to the rubber. 2. The change in effectiveness of such agents points to the fact that there is significant connection between mechanochemical phenomena occurring during milling and fatigue of the polymer, which must be taken into account in manufacturing practice. 3. The effect of preliminary milling of the rubber with antifatigue agents on fatigue life of the compound apparently can be explained as resulting from consumption of antifatigue agents in the milling process, owing to mechanochemical reactions.

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