Dresden 2011 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 34: Poster: Elastomers and Gels

CPP 34.1: Poster

Wednesday, March 16, 2011, 17:00–19:00, P2

Tailoring the near-surface composition profiles of pressure sensitive adhesive films and the resulting mechanical properties — •Alexander Diethert¹, Katharina Ecker¹, Yana Peykova², Norbert Willenbacher², and Peter Müller-Buschbaum¹ — ¹TU München, Physik Department, LS Funkt. Mat., James-Franck-Str. 1, 85748 Garching, Germany — ²KIT, Inst. f. Mech. Verfahrenstechnik und Mechanik, Kaiserstraße 12, 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 ethylhexylacrylate and the glassy monomer methylmethacrylate.

Recently, we observed the existence of enrichment layers of one type of monomer near the sample surface having an influence on the tackiness [1]. We extend this work towards tailoring the near-surface composition. One route is to use selectivity by exposing the samples to an atmosphere with the appropriate relative humidity. As a result, the surface content of the more polar PMMA increases with increasing humidity. The effect gets less pronounced with increasing distance from the film surface.

[1] Diethert et al, ACS Appl. Mater. Interfaces 2, 2060-2068 (2010)