Mechanical properties of cellulose fibres and wood. Orientational aspects in situ investigated with synchrotron radiation.
Highly oriented native cellulose fibres (flax) and softwood (pine) have been investigated by means of X-ray diffraction. Local structural information was obtained by using X-ray microbeams. Tensile tests were performed in situ, revealing a change of orientation of cellulose microfibrils in materials with tensile strain. In flax fibres, the microfibrils rotate during the first percent of stretching, into a more parallel orientation with respect to the fibre axis. For wood, a decrease of orientation with the onset of strain hardening is found for the first time.
Kölln
Klaas
K
Institut für Experimentelle und Angewandte Physik, Universität Kiel, Leibnizstrasse 19, D-24098 Kiel, Germany.
Grotkopp
Ingo
I
Burghammer
Manfred
M
Roth
Stephan V
SV
Funari
Sergio S
SS
Dommach
Martin
M
Müller
Martin
M
D002482:Cellulose / Q000648:ultrastructure*; D017356:Synchrotrons; D013718:Tensile Strength; D014934:Wood; D014961:X-Ray Diffraction / Q000379:methods*
D002482:Cellulose