SHEAR-STRENGTH OF PRESSURE-SENSITIVE ADHESIVES AND ITS CORRELATION TOMECHANICAL-PROPERTIES

Correlations between shear resistance and the mechanical properties of pressure sensitive adhesives are studied by measuring the deformation behaviour in the static shear test and determining the dynamic shear modulus of the adhesive. For polymers with low or moderate viscosities , the shear strain vs time characteristics in a shear test and accordi ngly the shear strength can be evaluated from the master curves of the dynamic shear modulus or the dynamic viscosity. These exact calculati ons cannot be applied to highly viscous or slightly crosslinked polyme rs. On the base of the model experiments, an empirical correlation bet ween een shear strength and the dynamic shear modulus is established w hich seems to be generally valid.