Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 22: POSTER C

CPP 22.40: Poster

Donnerstag, 27. März 2003, 12:00–14:00, ZEU/250

The effect of surface roughness on the tack of pressure sensitive adhesives — •S. Loi, E. Maurer, and P. Müller-Buschbaum — TU München Physik Department LS E13, James-Franck-Str.1, 85747 Garching

Controlling the adhesion of materials is important in several industrial applications. For example, pressure sensitive adhesives (PSA) should be highly sticky including the ability of removament and, on the other hand, coatings and paints not. We investigate the adhesion of an acrylic PSA on a glass probe with the tack testing technique. The characteristic of PSAs is a high tackiness, that means a high force required to separate the probe and the polymer film connected with a high energy dissipated during the bonding-debonding cycle. We investigate Poly(n-butylacrylat) (PnBA), a model adhesive for industrial applications. In the utilised geometry a flat ended cylindrical punch is pressed on the polymer surface and after a bonding time withdrawn under controlled conditions (constant velocity). The force is detected as a function of the probe-sample distance. In addition to the commonly addressed parameters like contact time, contact pressure or debonding velocity, the surface roughness of the punch and of the film are varied. It turns out, that in particular, the force and the adhesive energy depend on the probe roughness. In general, smooth probes yield a bigger adhesive energy than rough ones. In the presented work we vary the roughness of the probe utilising different polished glass cylinders.