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Gewählte Master / Diploma Thesis:

Stefan Veigel (2008): Verstärkung von Klebstoffen mit Cellulosefibrillen und Cellulosefasern.
Master / Diploma Thesis, BOKU-Universität für Bodenkultur, pp 52. UB BOKU obvsg FullText

Data Source: ZID Abstracts
Abstract:
In previous studies, cellulose has been used extensively for polymer reinforcement, mostly in the form of fibres, micro- and nano-scale fibrils or whiskers. In the present study there was the novel attempt to exploit the reinforcing potential of cellulose to enhance the mechanical properties of commonly used wood-adhesives. The strength properties of four adhesive systems were investigated using varying contents of reinforcement as well as different bond line thicknesses. The reinforcement of the adhesives was effected by a needle-punched lyocell fabric (regenerated cellulose fibre) and cellulose nanofibrils, prepared from bacterial cellulose and beech sulphite pulp respectively. To receive nanofibrils, the cellulose substrates were disintegrated mechanically by means of a laboratory refiner and a high-pressure laboratory homogeniser. Additionally to mechanical testing, the hardened glue lines were investigated using incident light microscopy. Based on the results of lap joint testing it could be shown that shear strength of urea-formaldehyde-(UF)-bonded samples increased about 30% due to the incorporation of cellulose-nanofibrils. Furthermore a considerable enhancement of ductility was observed for UF-bond lines that exhibit a comparatively brittle material behaviour in unreinforced state. In case of cellulose-reinforced samples, ultimate strain was up to 35% higher compared to bond lines without reinforcement.

Beurteilende(r): Gindl-Altmutter Wolfgang

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