Abstract
The damping properties of Eucommia ulmoides gum (EU gum) and its rubber blends were systematically studied using hysteresis loss ratio and dynamic mechanical tests. The former method indicates that the hysteresis loss ratio of EU gum is much higher than that of other rubbers. Because the residual deformation of EU gum is very large, it cannot be directly used as an elastic damping material; it can only be used as a modifier of other rubbers to obtain elastic damping materials. The results show that EU gum can increase the hysteresis loss ratio of a number of rubbers. The latter method shows that EU gum can also increase E'' (loss modulus) of blended rubber; this is consistent with the results of the former method. A blend of EU gum/Nitrile -Butadiene rubber (NBR) is the best elastic damping material with the largest hysteresis loss ratio, E'', and low residual deformation (less than 20%). The contribution of EU gum to the damping property of blended rubber might be associated with the influence of the crystallinity of EU gum.
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