ISSN:
1435-1528
Keywords:
Adhesion
;
peel
;
master curves
;
mechanisms
;
elongation
;
surface energy
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
Abstract We consider the adhesion of a pressure sensitive adhesive on different substrates (Pyrex, stainless steel, Plexiglas). First, we characterize the rheological properties of the adhesive material and compare it with the predictions of Lodge's model. Then we investigate the adhesive properties using a special machine which enables us to peel at 90° with a fixed peeling front and we construct peeling master curves on different substrates. The mechanisms of peeling are analyzed by looking at the peeling front using a video camera. We realize that the flow within the filaments and ribs observed is mainly of elongational type. Also, by looking at the shape of the backing, we find out that most of the energy is spent within the ribs or filaments. To understand the effect of rheology on adhesion, we propose a simple model to predict peeling curves, by assuming that the flow is mainly of elongational type. This explains the high energy regions. At low velocities, surface energies become important and their effect is also analyzed. To conclude, we propose different dimensionless equations which explain the importance of the relevant parameters, via dimensionless numbers. Thus the peeling energy is investigated, as well as the condition which predicts the transition from cohesive to adhesive peeling.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00396330
Permalink
