Effect of nonlinear viscoelastic properties on tack

Abstract

The influence of rheological and surface properties on adhesive tackiness are studied. In particular, the importance of the elongational properties is emphasized in a model, which considers only the adhesive contribution while neglecting the importance of cavitation and surface roughness. This simple analysis allows us to recover the different types of curves (i.e., different adhesive materials) obtained in the literature on tack. Elastic, strain‐hardening, and viscous adhesive materials are considered. The question of the importance of surface properties is raised and discussed. © 2003 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 41: 3139–3149, 2003

The effect of flow on the physical properties of polyurethane/carbon nanotubes nanocomposites: Repercussions on their use as electrically conductive Hot-Melt adhesives

“…The obtained results, shown in Fig. , follow the “viscoelastic adhesion” pattern , characterized by a force decrease to a plateau value, and assumed to be compatible with a fibrillation process. At the relatively high debonding velocity contemplated in our experiments, 0.314 mm s −1 , the expected viscoelastic response of neat PUR should be associated with polymer entanglements, whereas the existence of a combined carbon nanotube/polymer network (besides of the entanglement network of the PUR) marks the viscoelastic behaviour of 4 wt% MWCNT/PUR nanocomposite.…”

“…Within the context of the technical aspects involved in ECAs, we have to consider the correlation between viscoelastic results and probe tack results, which has brought about a certain number of publications, mostly in the field of Hot Melt adhesives . In a recent paper on the same MWCNT/PUR nanocomposites considered in this work, good tack results have been reported.…”

Peeling of polydimethylsiloxane adhesives: The case of adhesive failure

“…At small Deborah numbers ( De < 1), the viscous effects dominate, whereas for high Deborah numbers ( De > 1), elasticity becomes important. Such effects (deformations) can be relevant here because mechanisms involved during probe‐tack experiments are comparable with the ones in peel tests 24. We will rather introduce the Weissenberg number W i = λ V / e (λ = 3 s, V is the velocity of peel, and e the adhesive thickness), as in our previous study 8.…”

Increasing the Tackiness of Statistical Poly(Butyl Acrylate) and Poly(Ethyl Acrylate) Network Materials via RAFT Polymerization

“…Tack denotes the ability of the PSA to build strong intermolecular interactions with an adherent on a short time scale and with low pressures . For this ability, the viscoelastic properties of the PSA are of considerable importance,, which are directly governed by the glass transition temperature of the PSA and the crosslink density, respectively. In addition, wetting is a further important parameter for the tack of a PSA, as it governs whether the PSA and the adherent have a strong contact on the molecular scale.…”