Berlin 2012 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 11: New Instruments and Methods

CPP 11.6: Vortrag

Dienstag, 27. März 2012, 11:00–11:15, C 243

Characterization of morphology and orientation of uni-axially oriented cast films with confocal and polarized μ-Raman Imaging-Spectroscopy — •Krisztina Vincze-Minya, Tobias Keplinger, and Sabine Hild — Institute of Polymer Science, Johannes Kepler University, Altenbergerstr. 69, 4040 Linz, Austria

The morphology of a semi-crystalline polymer has a great bearing on its mechanical strength. The ratio of crystalline and amorphous phases and molecular orientation in these phases are essential to optimize the physical properties. Confocal μ-Raman microscopy is a useful characterization technique to characterize the orientation not only of the crystalline but also of the amorphous phase. With confocal μ-Raman Imaging it is possible to calculate not only an average crystallinity, but also to determine the local crystallinity. The main focus is to calculate the crystallinity degree and to characterize the orientation of the uni-axially oriented PP cast films. The ratio of the peaks at 841 and 809 cm-1 is sensitive to the molecular anisotropy and the crystallinity values were calculated by the Nielsen method[1]. The ratios I(809)/I(841) and I(973)/I(998) are used for the characterization of orientation heterogeneity (I = intensity of a peak)[2]. Based on these results the orientation and crystallinity of shear crystallized samples are investigated. [1]Nielsen A.S., Batchelder D.N., Pyrz R ,2002, Polymer, 43(9), 2671-2676 [2]J. Martin, S. Margueron, M. Fontana, M. Cochez, P. Bourson, 2009, Polymer Engineering & Science, 50(1), 138-143