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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 21: Polymer Physics II
CPP 21.1: Vortrag
Mittwoch, 25. März 2009, 09:30–09:45, ZEU 114
Structure analysis with micrometer spatial resolution in polymer fibers — •Norbert Stribeck1, Ulrich Nöchel1, and Armando Almendárez Camarillo2 — 1Universität Hamburg, Institut TMC, 20146 Hamburg, Germany — 2Instituto Tecnológico de Celaya, 38010 Celaya Gto., Mexico
The investigation of structure gradients in fibers, cylindrical rods or pipes by the X-ray microbeam scanning technique is put on its theoretical fundament. It is shown that the observed smeared structure information is readily reconstructed by the inverse Abel transform, for which fast and low-noise algorithms are available [1]. As a result, the scattering patterns emanating from the series of volume elements on the fiber radius are obtained (X-ray scattering-fiber computer-tomography, XSF-CT). Perfect reconstruction is achieved when the structure in every voxel shows fiber symmetry (local fiber symmetry, LFS). Violation of LFS results in characteristic reconstruction errors [2]. These can be interpreted in terms of two elementary deviating topologies (tangential grain, radial grain). Application to nanostructure analysis of polymer fibers is demonstrated.
[1] Stribeck et al. Macromol. Chem. Phys. (2008) 209(19),
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[2] Stribeck et al. Macromolecules (2008) 41(20), 7637-7647