University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Fariborz Zargar-Yaghubi
(2004):
Imprägnierung von Massivholz mit Melamin-Formaldehyd.
Master / Diploma Thesis,
BOKU-Universität für Bodenkultur.
UB BOKU
obvsg
- Abstract:
- Wood is a valuable material with many positive material properties, for example the favourable mass/strength relationship, the low thermal conductance, the biological degradability as well as its neutral carbon dioxide balance. In spite of that, some wood qualities are felt as negative by the end user, for example the swelling and shrinking with variable moisture content, or sometimes also unsatisfactory mechanical qualities are example of that. A promising way to improve wood qualities is chemical modification with melamine-formaldehyde (MF). Melamine-formaldehyde (MF) resin impregnation has shown considerable potential to improve a number of wood properties, such as surface hardness and weathering resistance. In this study, selected factors influencing the uptake of MF resin into the cell wall of softwood were studied. Using UV-microspectroscopy, it could be shown that water soluble MF diffused well into the secondary cell wall and the middle lamella. Considerable melamine concentrations in the cell wall were achieved after an impregnation of one day. High cell wall moisture content, high water content of the resin used for impregnation, and low extractive content are factors which are favourable for MF resin uptake into the cell wall. For dry cell walls, solvent exchange drying improved resin uptake to a similar extent, as it was the case when cell walls were soaked in water.
- Beurteilende(r): Teischinger Alfred