Measurement of Rubber Tack

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Abstract
An instrument for measurement and study of tack of rubber compositions is described. The method involves pressing together two specimens of polymer compound with a chosen force for a predetermined time, and then measuring the time to separate them with a preselected force. Development of tacky adhesion is related to the product of force and a function of time that the specimens are pressed together. The measure of adhesion also involves the product of force and a function of time required for complete separation. Empirical treatment yields an equation to describe tacky behavior of a rubber composition in terms of the ratio of these products of force and time, the ratio being designated as the tack index of that composition. An example is given by comparing tack of SBR with that of natural rubber. SBR exhibits a tack index of about unity over a wide temperature range while natural rubber has a large tack index at 25° C, which decreases with increasing temperature. It is suggested that the excellent tack of natural rubber is due to crystallization with elongation.

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