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Gewählte Doctoral Thesis:

Christian Hansmann (2004): CHEMICAL MODIFIKATION OF SOLID WOOD.
Doctoral Thesis, BOKU-Universität für Bodenkultur. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Chemical modification for the improvement of selected properties of solid wood is the topic of this thesis. The chosen method was a ¿two-step-modification¿ procedure, involving, as a first step, bulk modification of a solid wood sample. Bulk modification was achieved by acetylation or silylation to improve dimensional stability and durability. In a second step, the surface was treated by means of melamine impregnation in order to improve surface properties like hardness, scratch resistance, wear resistance and UV-stability. At first, fundamental transport processes of the reagents into and in the wood were identified. Regarding bulk modification, acetylation with isopropenylacetate seemed promising with respect to anti swelling/shrinkage efficiency and compatibility with surface treatment with melamine formaldehyde resin, while silylation appeared to be in need of improvement concerning reagents and treatment scheme. Impregnation with melamine formaldehyde resin performed very well and led to several improvements of selected properties of solid wood such as surface hardness and UV-stability. These improvements could be achieved by preserving the porous character of wood. Additionally, two novel analysis methods for modified wood were developed and assessed positively.


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