Berlin 2001 – scientific programme
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CPP: Chemische Physik und Polymerphysik
CPP 19: Poster: New Methods, Thin Polymer Films, Monolayers
CPP 19.26: Poster
Thursday, April 5, 2001, 12:30–15:00, AT1
Morphological changes of polypropylene during biaxial stretching at higher temperatures investigated by scanning force microscopy — •Karl Stefan Imhof1, Sabine Hild1, Othmar Marti1, Andreas Pfau2, Volker Rauschenberger2, and Ullrich Dahn2 — 1Experimentelle Phyik, University of Ulm, 89069 Ulm — 2BASF AG, Polymer Research, 67056 Ludwigshafen
The mechanical properties of isotactic polypropylene films depend on their morphology. The morphology can be modified by variations in the process conditions. For example, thin films prepared by biaxially stretching at higher temperature show different mechanical behavior depending on the process parameter. Up to now, the deformation mechanism during processing biaxial stretched films is still not well understood. To explain the differences in morphology and resulting mechanical properties it is necessary to study the changes in the morphology of films formed under various process conditions.
The aim of this study is to investigate the morphological changes of a melt pressed film during biaxial stretching at higher temperatures. To prepare biaxially stretched film which are comparable to industrial films different methods have been developed. The resulting morphologies are investigated by scanning force microscopy. It can be shown that during stretching at higher temperatures the spherulitic morphology of the basic raw film is transferred into a isotropic meshed structure.