Nanoindentation of the Wood-Adhesive Interface
Abstract
The increasing economical importance and technological complexity of wood composites require a continuous optimisation of adhesive bonding technology. However, in particular with regard to the natural material wood, a number of fundamental questions remains to be understood, before the significantly different mechanical performance of different adhesive systems can be fully explained. Nanoindentation, a method of hardness testing in the micro-Newton range, was shown to be very suitable in the context of wood adhesive bonds by the group of the applicant and recently also by other researchers. In the current project it is planned to further develop nanoindentation technique with the aim of performing direct measurements of the adhesion energy between the wood cell wall and the adhesive for the first time. In order to perform such experiments, a wedge- or cone-shaped indenter tip will be driven into the interface between wood cell wall and adhesive of specially prepared specimens. Through simultaneous measurement of load on the indenter tip and tip displacement, the energy of adhesion will be determined. This will enable to directly compare the cell-wall adhesion of different adhesive systems without the biasing effects of wood micro and macrostructure, as is the case in macroscopic standard specimens. Based on new findings on adhesion mechanisms acquired with this new method, suggestions for a further improvement of wood adhesive bonding systems will be made.
Publikationen
Project staff
Wolfgang Gindl-Altmutter
Univ.Prof. Dipl.-Ing. Dr.nat.techn. Wolfgang Gindl-Altmutter
wolfgang.gindl@boku.ac.at
Tel: +43 1 47654-89111
Project Leader
01.09.2009 - 31.08.2011