Regensburg 2013 – wissenschaftliches Programm

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DY: Fachverband Dynamik und Statistische Physik

DY 8: Poster I: Glasses and Glass Transition (joint session DY/DF/CPP)

DY 8.5: Poster

Montag, 11. März 2013, 17:30–19:30, Poster C

Thermomechanical Properties of Organic-Coatings: A scanning force microscopy study — •Bernhard Jachs¹, Bernhard Strauß², and Sabine Hild¹ — ¹Institute of Polymer Science, JKU Linz, Altenbergstraße 69, 4040 Linz, — ²voestalpine Stahl Gmbh, 4020 Linz

Coil Coating is a continuous industrial process where one or more polymeric layers with thicknesses ranging from 5 up to 50 μm are applied on steel coils to protect them against environmental impacts. For further processing of the coated material, the knowledge of thermal and mechanical properties of the coating is crucial. Widely used analytical techniques (DSC, DMA) require special sample preparation where the coating has to be removed from the substrate or is prepared as a free standing coating film. In this work a SFM equipped with a heating stage was used to directly investigate mechanical properties of coatings as a function of temperature by performing nanoindentation measurements. Static measurements were carried out at different displacement rates and temperatures. By taking into account contact-mechanical models, which describe the tip-sample-interaction, the Elastic Modulus can be obtained as a function of temperature and displacement rate. Shifting the curves according to the Williams-Landel-Ferry equation yields a mastercurve which allows extrapolating mechanical properties beyond the measuring range. In addition, dynamic measurements have been carried out modulating the tip position at different frequencies and temperatures. Using proper viscoelastic models, Storage and Loss Moduli as well as loss tangent can be determined.