APPROXIMATE METHOD TO EVALUATE THE FRACTURE TOUGHNESS OF INTERFACES BETWEEN SOFT VISCO-ELASTIC LAYERS AND WEAKLY ADHERING SURFACES

摘要

We have shown that the adhesive properties of a vis-coelastic PSA on a rigid surface can be evaluated quantitatively with a probe method. The confined geometry of the film before debonding combined with a relatively compliant testing apparatus, allows us to load the interface rapidly and essentially elastically, before the debonding occurs with significant viscoelastic dissipation. Since the experiment is performed at low values of displacement, no fibrillation can take place and the measured adhesion energy only reflects the interfacial component. This method may be an interesting alternative to peel tests, for low adhesion surfaces, since it can provide relatively easily the equivalent of a G vs. V curve for a specific interface. However further investigation is needed to explore the limitations of the method in the case of more viscoelastic and more adhesive systems.