Abstract
AbstractAn easily constructed, cheap and compact stress relaxometer has been designed for aging tests on elastomers. Its construction is such as to allow it to fit inside a multicavity metal block oven commonly used for aging tests. The instrument works well on continuous and intermittent cycles and its action is illustrated by a brief examination of the stress relaxation properties of vulcanized nitrile rubber/PVC blends. The presence of PVC increases the initial (physical) relaxation both at high and normal temperatures under conditions of continuous stress. The rate of relaxation thereafter increase with increase in PVC content. Under intermittent conditions the PVC seems to encourage a crosslinking reaction, as does carbon black.
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