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DY: Fachverband Dynamik und Statistische Physik

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

DY 8.3: Poster

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

Local Thermal Analysis as a Tool for Morphological Investigation of Polypropylene — Thomas Fischinger, •Lisa Maria Uiberlacker, and Sabine Hild — Institute for Polymer Science, Johannes Kepler University, Altenbergerstraße 69, 4040 Linz, Austria

A basic understanding of physical and chemical properties of polymers is of fundamental importance for the development of advanced polymers. Thermal analysis methods are generally used to provide important and reliable data. However, up to now mainly bulk properties of polymers have been detected. Conventional methods reach a limit for applications such as the investigation of crystal structures. Therefore, a method is proposed for nano-thermal characterization of polymers using scanning probe microscopy (SPM) in combination with heatable cantilever probes. This method is based on an appropriate temperature calibration, which provides a reliable correlation between applied voltage and the temperature at the tip. LTA measurements were applied to high moleculare isotactic polypropylene with varying lamellar thicknesses. Furthermore, the structure and morphology of randomly distributed isotactic propylene-1-hexene-copolymer (PHCP) were investigated with a focus on local thermal properties. In this study it will be shown that it is possible to investigate the differences in softening of α- and γ- structure of PHCP.