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Gewählte Master / Diploma Thesis:

Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 89. UB BOKU obvsg FullText

Data Source: ZID Abstracts
As wood consists of different polymers such as cellulose, hemicellulose and lignin, one can assume that the interactions between wood and polymers or adhesives differ. Resulting from the different compositions in polymers of the model-fibres used in this work, an influence on the adhesion with the different matrix-polymers is expected. Based on different theories on adhesion, the aim of this thesis is to debunk and retrace the various bonding options using two specific measurement methods and to find appropriate measurement methods, on a macro- and microscopic level (Nanoindentation). The tests in this thesis are based on the investigation of synthetic polymers, such as Urea-Formaldehyde (UF), Polyurethane (PU), Low-Density-Polyethylene-Maleic anhydride (LDPE-MA) and Polylactid-Acid (PLA) used on lignocellulosic model-fibres with smooth surfaces. Another aim of this investigation is to gain a better understanding of the interactions between the single wood components and different matrix components or materials. Special attention is given to the polarity of the different components. Nanoindentation and the Microbond test are used to determine the success of the adhesion. There are differences in the results from the nanoindentation measurements at the relative comparison between fibres at different binding agents as well as between the fibres at one binder which correspond with the expectations. Nevertheless, they do not show a clear structure. The results of the tests using the Microbond method often show results contrary to the expectations based on adhesion theories and hypotheses. The Nanoindentation method holds the greatest potential for mechanical determination of the adhesion of the methods used.

Beurteilende(r): Konnerth Johannes

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