Abstract
Summary It is shown that plastic flow and relaxation of vulcanized natural rubber follow a logarithmic course with the time. As a result it is possible to define as “rate of flow” the ratio of the flow at constant tension to the logarithm of the time, and as “rate of relaxation” the ratio of the decline in tension at constant elongation to the logarithm of the time. A study of tension-rate of flow diagrams at different temperatures has shown that at room temperature a considerable part of the total flow measured is reversible and therefore must be considered as pseudo-flow . This pseudo-flow is caused by a retardation in the crystallization and diminishes at increasing temperature. As a result, at increasing temperature, the total rate of flow passes through a minimum. An analogous situation occurs with the phenomenon of relaxation.
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