Water sorption properties and dimensional changes of high wood-content WPC
2009 (English)In: Proceedings of the 5th meeting of the Nordic Baltic Network in Wood Material Science and Engineering / [ed] Andreas Bergstedt, 2009, 153-160 p.Conference paper (Refereed)
The increased use of wood plastic composites (WPCs) for outdoor building applicationsis accompanied by an increased need for research about their durability properties. Oneparticularly important feature is their water sorption behaviour which relates to e.g. theirdimensional stability, mechanical properties and decay resistance. In this study, we haveinvestigated the water sorption ability and resulting dimensional changes of WPCs witha comparable high wood content, i.e. ca 70 weight-%, prepared with either a heattreated, acetylated or unmodified wood component. The experiments involve immersionof thin veneers of the composites in water with registration of their weight anddimensional changes until they have reached saturation. The results show that the WPCscontaining a modified wood component show the lowest level of water sorption anddimensional changes after saturation compared with the WPCs containing unmodifiedwood. A notably lower degree of a supposedly algae growth is also observed for thesamples with acetylated wood. One question that was generated during thisinvestigation relates to the density of the wood cell-wall and its relation to the appliedwood modification route and moisture uptake. The general conclusion regarding this isthat further studies are necessary to encompass such a topic, e.g. by more precisemeasurements of the wood cell-wall density in both dry and wet state.
Place, publisher, year, edition, pages
2009. 153-160 p.
WPC, water sorption, dimensional changes, wood modification
Composite Science and Engineering
IdentifiersURN: urn:nbn:se:kth:diva-80936OAI: oai:DiVA.org:kth-80936DiVA: diva2:496923
5th meeting of the Nordic Baltic Network in Wood Material Science and Engineering. Copenhagen, Denmark. October 1-2, 2009
QC 201205022012-02-102012-02-102012-05-02Bibliographically approved