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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 49: Elastomers and Gels

CPP 49.8: Vortrag

Freitag, 26. März 2010, 12:00–12:15, H48

Surface-near structuring of pressure sensitive adhesive films — •Alexander Diethert¹, Volker Körstgens¹, David Magerl¹, Yana Peykova², Olga Lebedeva², Norbert Willenbacher², and Peter Müller-Buschbaum¹ — ¹TU München, Physik Department LS E13, James-Franck-Str. 1, 85747 Garching (Germany) — ²Universität Karlsruhe (TH), Institut für Mechanische Verfahrenstechnik und Mechanik, Gotthard-Franz-Str. 3, 76131 Karlsruhe (Germany)

Pressure sensitive adhesives (PSAs) are used for many different applications, such as for example adhesive foils or binding materials. A prominent class of PSA films is based on statistical copolymers. In the presented work we focus on the PSA model system P(EHA-stat-MMA) consisting of the tacky monomer ethyl hexylacrylate and the glassy monomer methyl methacrylate. The PSA films were prepared with solution casting.

In a previous x-ray reflectivity investigation we could prove the existence of enrichment layers of one type of monomer near the sample surface. Grazing incidence small angle x-ray scattering (GISAXS) experiments now added a new aspect: in addition to the layering also lateral structures are present. The data are modeled with cylindrical PMMA objects in a PEHA matrix. In particular, the evolution of the radii and the center-to-center distance during aging of the PSA film is quantified. Furthermore, the effect of this reorganization process on the adhesive properties is monitored with mechanical tack tests.