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Thin cellulose films as a model system for paper fibre bonds |
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| Authors: | Sebastian Rohm Ulrich Hirn Christian Ganser Christian Teichert Robert Schennach |
| Institution: | 1. Institute of Solid State Physics, Graz University of Technology, Petersgasse 16/2, 8010, Graz, Austria 4. CD-Laboratory for Surface Chemical and Physical Fundamentals of Paper Strength, Graz University of Technology, Petersgasse 16/2, 8010, Graz, Austria 2. Institute of Paper, Pulp and Fibre Technology, Graz University of Technology, Inffeldgasse 23 A, 8010, Graz, Austria 3. Institute of Physics, University of Leoben, Franz Josef-Strasse 18, 8700, Leoben, Austria |
| Abstract: | Thin cellulose films on silicon substrates are used as a model system for paper fiber bonds. The films are formed by spincoating trimethylsilylcellulose on the substrates. The films are regenerated using HCl gas. After swelling in water, two samples can be bonded like a sandwich. It is shown that this model system can be used to measure the bond strength between the two films under controlled conditions. For a detailed characterization the films are studied in terms of roughness with atomic force microscopy (AFM). The hardness of the films is investigated by AFM-based nanoindentation. The chemistry and the thickness of the films is studied by infrared spectroscopy. It is shown that this model system enables the evaluation of different bonding mechanisms discussed in pulp and paper research. Our results clearly indicate that Coulomb interaction is an important bonding mechanism. |
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