Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 16: Organic, polymeric, biomolecular films - also with adsorbates
O 16.8: Vortrag
Montag, 22. März 2010, 16:45–17:00, H46
Investigation of Cellulose Model-Systems for Paper Fiber-Fiber Bonds with FTIR and AFM — •Eduard Gilli1,2, Mario Djak1,2, Oliver Miskovic1,3, Franz Schmied1,3, Christian Teichert1,3, Eero Kontturi4, and Robert Schennach1,2 — 1CD-Laborarory for Surf. Chem. and Phys. Fund. of Paper Strength — 2Institute for Solid State Physics, TU-Graz, Austria — 3Institute of Physics, University of Leoben, Austria — 4TKK Helsinki, Finland
Spectroscopic investigation of the properties of fiber-fiber bonds in a sheet of paper often fails due to incorrect interpretation of the spectra, which are influenced heavily by geometrical effects, and scattering. Simulating the geometry as a multi-layer stack can help understanding the properties of paper, but the complex stochastic behavior of fibers cannot be modeled by these means. Investigation of model film systems from cellulose and hemicelluloses on Si can improve the situation, and close the gap between theory and experiment.
The cellulose model films were prepared by spin coating from trimethylsilyl cellulose solution and subsequent hydrolyzation. Further layers of hemicelluloses can be attached by spin coating or by adsorption. From atomic force microscopy measurements comprehensive knowledge of the layer roughness can be obtained, which is used as a prerequisite for spectral simulation. By spectral simulation optical effects can be identified, yielding a better understanding of the chemistry, going on between cellulose and hemicelluloses. Finally bonding strength tests on the model films can correlate the chemistry to the mechanical properties of fiber-fiber bonds.