Regensburg 2013 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 42: New Instruments and Methods
CPP 42.4: Vortrag
Donnerstag, 14. März 2013, 12:15–12:30, H39
Confocal and polarized μ-RAMAN Imaging-Spectroscopy as a tool for the estimation of crystallinity and orientation of iPP films and Pirouette rings — •Krisztina Vincze-Minya1, Sabine Hild1, Sibylle Jilg2, and Reinhard Forstner2 — 1Institute of Polymer Science, Johannes Kepler University, Linz, Austria — 2TCKT - Transfer Center for Polymer Technology GmbH, Wels, Austria
The morphology of iPP polypropylenes strongly depends on conditions of sample preparation. While stretching and temperature induced changes in polymer microstructure are widely explored the influence of shear stress is only sparsely investigated. Pirouette-dilatometer enable to prepare samples at defined temperature, pressure and cooling conditions may show local variations in crystallinity and orientation. Polarized confocal Raman microscopy (pCRM) will be used to investigate local variation crystallinity and orientation of iPP samples sheared by Pirouette-dilatometer. Therefore, pCRM imaging was applied on iPP cast and MDO films, which have an orientation measured via WAXS revealing the suitability of the method for the investigation of crystallinity and orientation with high spatial resolution. The Hermans orientation function was as well estimated and found to be also in good correlation with the WAXS data. Cast films: high depolarization ratio, low orientation, higher crystallinity degree. MDO films: low depolarization ratio, high orientation, lower crystallinity degree. The slow cooled Pirouette-samples have a lower crystallinity then the fast cooled samples, and the differences between the stretch and unstretched samples are also presented.