Berlin 2012 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 1: Interfaces and Thin Films I
CPP 1.10: Vortrag
Montag, 26. März 2012, 12:15–12:30, C 130
Influence of interface interactions on the inner structure of pressure sensitive adhesive films — •Markus Schindler1, Armin Kriele2, and Peter Müller-Buschbaum1 — 1TU München, Physik-Department, LS Funktionelle Materialien, James-Franck-Str.1, 85748 Garching, Germany — 2TU München, Forschungsneutronenquelle Heinz Maier-Leibnitz (FRM II), Lichtenbergstr.1, 85748 Garching, Germany
Pressure sensitive adhesives (PSAs) are widely used in everyday applications, industries and medicine, although surprisingly still lacking fundamental understanding on molecular scale. Individually tailored compounds exist for almost every possible environment, in which they still allow for reversible adhesion. Previous studies on our model system consisting of the statistical copolymer poly(ethylhexylacrylate-stat-methylmethacrylate) have shown that the two components of the polymer establish enrichment layers at the top surface that significantly affect the tack performance. We present insights into the internal reorganization of the solution cast adhesive films' inner structure upon different interface interactions which makes it possible to apply the same adhesive for higher and lower tack applications. The timescale on which these changes of the inner structure take place also provides information about the durability of established adhesive bonds. We present a study on the influence of an unpolar nitrogen atmosphere on the internal reorganization with time of adhesive films showing a complete inversion of the layering installed during the sample preparation.