Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.25: Poster

Dienstag, 27. März 2012, 18:15–20:45, Poster A

Frequency Response of Polymer Films Made from a Precursor Colloidal Monolayer on a Nanomechanical Cantilever — Ting Liu¹, Sascha Pihan¹, Marcel Roth¹, Markus Retsch¹, Ulrich Jonas³, Jochen Stefan Gutmann², Kaloian Koynov¹, •Hans-Jürgen Butt¹, and Rüdiger Berger¹ — ¹Max-Planck-Institut für Polymerforschung, Mainz, Germany — ²Institut für Physikalische Chemie, Universität Duisburg-Essen, Essen, Germany — ³BOMC Laboratory, FORTH IESL, Heraklion, Greece

Nanomechanical cantilevers (NMC) were used for the characterization of the film formation process and the mechanical properties of colloidal monolayers made from polystyrene (PS). Closely packed hexagonal monolayers of colloids with diameters ranging from 400 nm to 800 nm were prepared at the air water interface and then transferred in a controlled way on the surface on NMC. The film formation process upon annealing of the monolayer was investigated by measuring the resonance frequency of the NMC (≈12 kHz). Upon heating of non-crosslinked PS colloids we could identify two transition temperatures. The first transition resulted from the merging of polymer colloids into a film. This transition temperature at 147 ± 3^∘C remained constant for subsequent heating cycles. We attributed this transition temperature to the glass transition temperature Tg of PS which was confirmed by dynamic mechanical thermal analysis (DMTA) and using the time temperature superposition principle. The second transition temperature (175 ± 3^∘C) was associated to the end of the film formation process and was measured only for the first heating cycle.