Berlin 2012 – scientific programme

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 13: Poster: Interfaces and Thin Films

CPP 13.4: Poster

Tuesday, March 27, 2012, 18:15–20:45, Poster A

Molecular Dynamics of Miscible Polymer Blend Thin Films — •Huajie Yin and Andreas Schönhals — BAM Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205 Berlin, Germany

Molecular dynamics of Polystyrene (PS), Poly(vinyl methyl ether) (PVME) and their blend (PS/PVME) confined in thin film geometry have been studied by mean of broadband dielectric spectroscopy (BDS). No thickness dependence of PS segmental dynamics was observed down to 14 nm. For pure PVME, three relaxation processes (Alpha,Beta and Gamma) were observed. The Arrhenius plots of the Beta and Gamma processes have activation energy of 38.3 kJ/mol and 20.5 kJ/mol, respectively. The relaxation rate of the Alpha process is well described by the Vogel-Fulcher-Tamman (VFT) equation. Thin films of PS/PVME polymer blend in the weight ratio of 25/75 have been investigated for different thicknesses. The broadening of the Alpha-relaxation peak for the polymer blend was observed, the intensity of which increases with the temperatures. The glassy dynamics of the polymer blend thin films are independent of the layer thickness under study.