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Mapping Orientation Distribution of Talc Particles in Polypropylene by Small-Angle X-ray Scattering Tomography
Norwegian University of Science and Technology, Faculty of Natural Sciences and Technology, Department of Physics.
2013 (English)MasteroppgaveStudent thesis
Abstract [en]

Small-angle X-ray scattering tomography has for the first time been used to investigate the spatially resolved orientation distribution of talc particles in a sample of injection molded isotactic polypropylene, where the particles had a preferred orientation along the axis of the injection. The scattering patterns in the direction perpendicular to the rotation axis of the tomography scan were used to retrieve the orientation distribution in a 2D cross section of the sample. Two different methods are presented, one using a numerical approach of simulated annealing and one method using a linear set of equations to find the distances the X-ray beam travels through the different orientation regions. The method of simulated annealing showed little to no promise in retrieving the orientation distribution while the method using a linear set of equations is successful at retrieving the main features of the orientation distribution. The resolution is however not yet good enough to distinguish fine details inside the sample. It is believed that with further work on the model used and additional constraints on the reconstruction algorithm higher precision in the retrieved orientation distribution can be achieved.

Place, publisher, year, edition, pages
Institutt for fysikk , 2013. , 95 p.
URN: urn:nbn:no:ntnu:diva-23619Local ID: ntnudaim:10229OAI: diva2:678348
Available from: 2013-12-11 Created: 2013-12-11 Last updated: 2013-12-11Bibliographically approved

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