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Gewählte Doctoral Thesis:

Boris Forsthuber (2016): PHOTOSTABILIZATION OF WOOD SURFACES DURING OUTDOOR WEATHERING BY TRANSPARENT LIGHT STABILIZATION CONCEPTS.
Doctoral Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe, BOKU-Universität für Bodenkultur, pp 125. UB BOKU obvsg

Data Source: ZID Abstracts

Abstract:: Wooden surfaces are appreciated by customers for their pleasing visual appearance. Hence, there is an increasing demand from customers and architects to use transparent coatings, which should keep the initial appearance of wood in the unweathered state. However, stabilization of wood surfaces against photooxidative discolouration by transparent coatings is a challenging task. Therefore, the present thesis focuses on the stabilization of wood surfaces by clear coatings comprising various light stabilizing additives to reduce the photooxidative discolouration. Further, a method was developed in order to gain a spatially resolved monitoring of the light induced discolouration of wood surfaces exposed to Xenon arc light. From the results, a characterization of the properties of the different light stabilizing additives could be obtained. Thereby, significant differences of the additives in terms of the stabilization properties of both the wood surface as well as the polymeric binder of the coating systems were found. Some light stabilizing additives showed a high stabilization performance of the wood surface against photoinduced discolouration, but led to an increased photooxidation of the polymeric binder. Based on these results from the present thesis, light stabilizing additives can be chosen according the application demands. Depending on the specified requirements such as the optical characteristics, discolouration tolerance or mechanical properties, certain light stabilizing additives can be favoured. The developed method for spatially resolved monitoring of the discolouration of wood surfaces allows the estimation of the colour change of earlywood and latewood, separately. This could be of practical use for the visual estimation; Betreuer: Teischinger Alfred; 1. Berater: Müller Ulrich; 2. Berater: