Orientation of cellulose crystallites in regenerated cellulose fibres under tensile and bending loads |
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| Authors: | Wolfgang Gindl Klaus J Martinschitz Peter Boesecke Jozef Keckes |
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| Institution: | (1) Kompetenzzentrum Holz GmbH, Linz, Austria;(2) Erich Schmid Institute of Materials Science, Austrian Academy of Sciences and Institute of Metal Physics, University of Leoben, Leoben, Austria;(3) European Synchrotron Radiation Facility, Grenoble, France;(4) Lenzing R&D, Lenzing, Austria;(5) Department of Materials Science and Process Engineering, University of Natural Resources and Applied Life Sciences, Vienna, Austria; |
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| Abstract: | The degree of orientation in regenerated cellulose fibres with a diameter of 36μm was determined using position-resolved synchrotron X-ray microbeam diffraction. The fibres were characterized in unstrained condition, under tensile strain, and in bending. A homogeneous distribution of the degree of crystalline orientation (Herman’s orientation factor f
c = 0.85) across the fibre thickness was found in the unstrained fibre. The degree of orientation of cellulose crystallites increased in a linear manner with increasing tensile strain applied to the fibre. Also in bending, a linear relationship between applied strain and the degree of crystalline orientation was found, where f
c increased in tension and decreased in compression. This linear relationship was found to be valid for both the tensile and the compressive zone of the bent fibre. |
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