Regensburg 2004 – wissenschaftliches Programm

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SYLS: Life Sciences on the Nanometer Scale - Physics Meets Biology

SYLS 3: Symposium "Life Sciences on the Nanometer Scale - Physics Meets Biology"

SYLS 3.47: Poster

Mittwoch, 10. März 2004, 16:00–18:30, B

Influence of water on the mechanical properties of wood — •Ingo Grotkopp¹, Klaas Kölln¹, Sergio S. Funari², Martin Dommach², and Martin Müller¹ — ¹IEAP, Uni Kiel, 24098 Kiel — ²MPIKG Golm c/o HASYLAB, Hamburg

The unique mechanical properties of the biological material wood strongly depend on the water content. Water is not only present in the lumina of the wood cells but is adsorbed to the cell walls. These are a composite of nanocrystalline cellulose microfibrils embedded in a disordered matrix. We investigated dry and wet wood using X–ray diffraction techniques using synchrotron radiation. Tensile tests were carried out in situ. The changes in the fibre diffraction diagrams upon stretching enable us to conclude on the microscopic mechanisms responsible for the dependence of wood properties on water content. Implications for the use of wood as a biomaterial in trees (wet) and construction material (variable moisture content) are discussed.