caa a22 4500 463216628 CHVBK 20180405153158.0 cr unu---uuuuu 170326e20071001xx s 000 0 eng 10.1007/s00226-007-0141-x doi (NATIONALLICENCE)springer-10.1007/s00226-007-0141-x The effect of axial strain on crystalline cellulose in Norway spruce [Elektronische Daten] [Marko Peura, Klaas Kölln, Ingo Grotkopp, Pekka Saranpää, Martin Müller, Ritva Serimaa] The effect of strain on dry, clear Norway spruce (Picea abies [L.] Karst.) wood was studied by tensile testing along the cell axis and by in situ X-ray diffraction measurements. The mean microfibril angle (MFA) was initially 3-12 degrees and did not decrease due to strain. Based on the positions of the reflections 200 and 004 of crystalline cellulose, cellulose chains elongated and the distance between the hydrogen bonded sheets of chains decreased due to the strain. The elongation of the unit cell parallel to the cellulose chains was twice as high in juvenile wood as in mature wood. The (X-ray) Poisson ratio ν ca for crystalline cellulose in Norway spruce was calculated from the deformation of the unit cell. The average ν ca of earlywood was 0.28±0.10 in juvenile wood and 0.38±0.23 in mature wood. In latewood, the average ν ca was 0.48±0.10 in juvenile wood and 0.82±0.11 in mature wood. The average ν ca values were not directly correlated to the crystallite dimensions or to the mean MFA in juvenile and mature earlywood and latewood. The results show that the amorphous matrix has a definite effect on the deformation of cellulose crystallites. Springer-Verlag, 2007 Peura Marko Department of Physical Sciences, Division of X-ray Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut Kölln Klaas Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut Grotkopp Ingo Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut Saranpää Pekka The Finnish Forest Research Institute (METLA), P.O. Box 18, 01301, Vantaa, Finland aut Müller Martin Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut Serimaa Ritva Department of Physical Sciences, Division of X-ray Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut Wood Science and Technology Springer-Verlag 41/7(2007-10-01), 565-583 0043-7719 41:7<565 2007 41 226 https://doi.org/10.1007/s00226-007-0141-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s00226-007-0141-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Peura Marko Department of Physical Sciences, Division of X-ray Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut NATIONALLICENCE 700 1- Kölln Klaas Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut NATIONALLICENCE 700 1- Grotkopp Ingo Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut NATIONALLICENCE 700 1- Saranpää Pekka The Finnish Forest Research Institute (METLA), P.O. Box 18, 01301, Vantaa, Finland aut NATIONALLICENCE 700 1- Müller Martin Institut für Experimentelle und Angewandte Physik der Christian-Albrechts-Universität zu Kiel, Leibnizstraße 19, 24098, Kiel, Germany aut NATIONALLICENCE 700 1- Serimaa Ritva Department of Physical Sciences, Division of X-ray Physics, University of Helsinki, P.O. Box 64, 00014, Helsinki, Finland aut NATIONALLICENCE 773 0- Wood Science and Technology Springer-Verlag 41/7(2007-10-01), 565-583 0043-7719 41:7<565 2007 41 226 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer