Berlin 2005 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 9: SYMPOSIUM: Polymer networks and beyond: From molecular structure to materials and biological functions POSTER

CPP 9.10: Poster

Samstag, 5. März 2005, 16:45–18:45, Poster TU D

In situ ultra small angle x-ray scattering on pressure sensitive adhesives — •E. Maurer, S. Loi, and P. Müller-Buschbaum — TU München Physik Department LS E13 James- Franck-Str. 1 85748 Garching

Pressure sensitive adhesives (PSA) stick to a huge variety of materials by applying a slight pressure. One of the most prominent applications in daily life are stick-on notes. Scientifically, the quality of adhesion can be quantified in the so called tack test. Under defined condition a probe punch is pressed onto a PSA film and after a defined time again retracted. The force on the probe is registered as a function of the film punch distance. Even for film punch distances of multi film thickness a non-zero force value is detected. As the punch is retracted from the substrate the material has to face the challenge to occupy a rapidly increasing volume and to respect as well its low compressibility. For this reason density heterogeneities are introduced in several length scales. Macroscopically bubbles embedded in the polymeric material can been observed by optical microscopy. In order investigate density heterogeneities beyond the optical resolution limit we applied ultra small angle scattering (USAX) in-situ to the tack test [1, 2]. Well ordered substructures existing beside the macroscopically visible cavities have been detected for several PSA systems.

[1] E. Maurer, S. Loi, D. Wulff, N. Willenbacher, P. Müller-Buschbaum; Physica B at press

[2] P. Müller-Buschbaum, T. Ittner, W. Petry; Europhys. Lett. 66 (2004) 513