Regensburg 2013 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 8: Poster: New Instruments and Methods

CPP 8.4: Poster

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

Scanning force microscopy and polarized confocal- RAMAN microscopy for in-situ characterization of uniaxially stretched ethylene based thermoplastic elastomers — •Jörg Mühlböck, Krisztina Vincze-Minya, and Sabine Hild — Institute of Polymer Science, Johannes Kepler University, Linz, Austria

Polyethylene based elastomers are low crystalline materials which show interesting elastic mechanical behavior due to physical crosslinking. Nevertheless, the morphology of these polymers is still sparsely resolved. For a better understanding of the unique mechanical properties, microscopic changes in morphology and strain-induced variation in chain orientation of two polyethylenes with statistically distributed octene or butene side chains were monitored during uniaxial stretching using scanning force microscopy (SFM) and polarized Raman microscopy. For these purpose a stretching device has been developed and integrated in an existing SFM to visualize differences between an unstretched and stretched sample. Additionally, the set-up will be used to determine crystallinity and orientation of the samples before and after deformation via polarized Raman microscopy and polymer chain orientations were calculated for quantitative analysis. The correlation between the orientation, the arrangements of the amorphous and crystalline phases and the mechanical properties of the material at different elongation ratios allowed an interpretation of the macroscopic behavior on the microscopic scale.