University of Natural Resources and Life Sciences, Vienna (BOKU) - Research portal
Gewählte Master / Diploma Thesis:
Marcel Kluge
(2016):
Nanocellulosic fillers for waterborne wood coatings.
Master / Diploma Thesis - Institut für Holztechnologie und Nachwachsende Rohstoffe,
BOKU-Universität für Bodenkultur,
pp 72.
UB BOKU
obvsg
- Abstract:
- Wood surfaces have to withstand different external influences, depending on their application. Therefore, coating materials are used to increase their resistance. One approach to enhance the functionality of those products is the application of nanoparticles. For nanocellulose it is known that already very small amounts can increase the mechanical properties considerably. However, few has been reported on their potential use in coating materials yet. In this thesis, the properties of composites prepared from a waterborne varnish and nanoscale cellulose were investi- gated. Nanocrystalline and nanofibrillar cellulose as well as acetylated nanofibrils were added in proportions of 0.5 and 2 % relative to the dry polymer. Considerably enhanced mechanical properties were found for the high filler content. Tensile tests of free-standing films resulted in a higher stiffness and the dynamic mechanical analysis showed an increased temperature stability. A more pronounced reinforcement effect was observed for the nanofibrils, compared to the nanocrystals at equal content. However, considerably lower results were achieved for the acetylated nanofibrils due to inhomogeneous distribution in the matrix. Regardless of filler content or type, no significant change in the water absorption was noticed. Nevertheless, the considerable rise in viscosity could limit the applicable processing methods for the coating material.
- Beurteilende(r): Gindl-Altmutter Wolfgang
- 2. Beurteilende(r):