Interdigitation between surface-anchored polymer chains and an elastomer : consequences for adhesion promotion
Thomas Vilmin, Caroline Tadivat, Liliane Leger, Hugh Brown, Elie Raphael
Abstract
We study the adhesion between a cross-linked elastomer and a flat solid surface where polymer chains have been end-grafted. To understand the adhesive feature of such a system, one has to study both the origin of the grafted layer interdigitation with the network, and the end-grafted chains extraction out of the elastomer when it comes unstuck from the solid surface. We shall tackle here the first aspect for which we develop a partial interdigitation model that lets us analytically predict a critical surface grafting density σ* P1/10N-3/5 beyond which the layer no longer interdigitates with the elastomer. We then relate this result with recent adhesion measurements.
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