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Determination of Tack Using Different Adhesive Substances and Substrates

Adhesion or tack describes the tendency of materials to form a connection to a substrate when contact pressure is applied for a short time. This property can be characterized with a Modular Compact Rheometer (MCR) from Anton Paar on both solid and liquid samples (solid tack, wet tack). Since the tack is not only dependent on the adhesive, but also on the substrate on which the adhesive is applied, a holder for mounting different plates on the MCR was developed.

Introduction

The tackiness of materials depends on various parameters, such as the cohesive forces of the adhesive itself, the adhesive forces between the substrate and the adhesive, the substrate, the dimensions of the bond and the aeration time before the substrates are brought together.

1.1 Adhesion

Adhesion describes the tendency of two different materials to stick to each other. There is no single theory which describes all adhesive effects, but several mechanisms have been proposed so far. Such mechanisms are mechanical adhesion (interlock due to filled pores and voids), chemical adhesion (ionic, covalent or hydrogen bonds), dispersive adhesion (van der Waals forces), diffusive adhesion (usually takes place when bonding polymers) and electrostatic adhesion (the tack is created by a difference in the electrical charge at the joint).

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