Control of adhesion strength in metal-elastomer joints during elastomer crosslinking
Abstract Possibilities of adjusting adhesion strength (AS) of metal-elastomer joints by controlling the degree of elastomer's crosslinking in the layer bordering on the substrate were considered. It was concluded that a maximum AS value can be achieved with the elastomer crosslinked incompletely. Such a situation corresponds to a transient stage between the viscous-flow (plastic) and highly elastic states, irrespective of the crosslinking modes (be it oxidation structurization or sulphur vulcanization). The joints thus prepared can function successfully but only if the main (working) layer has been completely vulcanized, i.e. if it is found in a highly elastic state. High values of AS, as well as acceptable mechanical properties in the elastomer, can be provided simultaneously by creating a lateral gradient in the crosslinking; its maximum value should be maintained at the substrate. Approaches have been worked out to increase AS values of metal-elastomer joints; they are based on adjusting the time-temperature conditions at which metal-elastomer joints are to be formed, or on variations of the composition of the vulcanizate being in contact with the substrate.
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