Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 22: POSTER C

CPP 22.19: Poster

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

Microscopic properties of adhesive polymer films — •E. Maurer, S. Loi, and P. Müller-Buschbaum — TU München Physik Department LS E13, James-Franck-Str.1, 85747 Garching

Pressure sensitive adhesives (PSAs) are of general interest for both basic research and industry applications. Typical examples in daily life are adhesive stickers, Scotch tape or stick-on notes. Examples in high tech industry cover a range from aircraft parts to micro contacts in semiconductor devices. Nevertheless, a microscopic understanding of PSAs is still not fully achieved. A macroscopic understanding is usually performed by tack testing experiments. In the tack geometry a probe punch is pressed under defined conditions onto the PSA film. Followed by a removement of the punch from the surface with a constant velocity while the force versus distance is detected. For a large number of PSAs fibrils are created during the debonding process. In the presented investigation the substructure of these fibrils as a typical microscopic property of adhesive polymer films is addressed. This microscopic information is correlated to the macroscopic data obtained from the tack measurements. The PSA films were prepared by solution casting, an experimental technique which enables to obtain thick (micrometer regime) homogenous films. Typically polymer concentrations between 30 and 100 g/l were used.