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Durability of high wood content WPCs
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0002-9156-3161
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Materials.ORCID iD: 0000-0001-7014-6230
2010 (English)In: Proceedings of the International Convention of Society of Wood Science and Technology andUnited Nations Economic Commission for Europe – Timber Committee, 2010Conference paper, Published paper (Refereed)
Abstract [en]

One increasing market segment of building materials is so-called biocomposites, or wood-thermoplastic composites (WPCs). Chiefly, these products are partly made from renewable resources such as wood residuals or agro fibres, functioning as reinforcement, and partly from recyclable thermoplastics or biopolymers, functioning as matrix. In general, WPC products are marketed as a low maintenance building material with a high outdoor durability. The intrinsic high moisture sensitivity of the wood component in combination with a low compatibility between the hydrophilic wood and hydrophobic thermoplastic may, however, result in poor long-term performance and outdoor durability. The objective of this paper is to recapitulate some of our research group’s observations and experience during recent years with respect to both field and laboratory tests related to the durability of WPCs. Of particular interest is one type of extruded WPCs with a comparable high wood content, i.e. ca 70 weight-%, prepared with either a heat treated, acetylated, or unmodified wood component. Observations from outdoor field trials, laboratory fungal decay tests, moisture sorption properties and effects on micromorphology, show that the use of a modified wood component in these WPCs considerably increases their long-term outdoor durability. One reason for this is related to the reduction of the moisture sensitivity of the wood component. Such durable biocomposite-type of building materials with a high wood-content level have the potential to fulfill the criteria for being eco-efficient, that is being both a sustainable and a cost-efficient “green” material.

Place, publisher, year, edition, pages
2010.
Keyword [en]
wood-plastic composite, WPC, modified wood, durability, moisture properties
National Category
Composite Science and Engineering
Identifiers
URN: urn:nbn:se:kth:diva-80939OAI: oai:DiVA.org:kth-80939DiVA: diva2:496924
Conference
International Convention of Society of Wood Science and Technology and United Nations Economic Commission for Europe – Timber Committee. Geneva, Switzerland. October 11-14, 2010
Note
QC 20120423Available from: 2012-02-10 Created: 2012-02-10 Last updated: 2012-04-23Bibliographically approved

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Wålinder, MagnusSegerholm, Kristoffer

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