Ageing of modified wood. Part 1: Wetting properties of acetylated, furfurylated, and thermally modified wood
-
Lars Elof Bryne
Abstract
The main objective of this work was to apply contact angle analysis to predict work of adhesion (Wa) between some modified wood materials and certain thermoplastics and adhesives. Wetting properties, i.e., contact angles, were measured by the Wilhelmy method on both freshly prepared and aged veneer samples of unmodified and acetylated Scots pine, furfurylated radiata pine, and heat treated Norway spruce. The sessile drop method was used to measure contact angles on a phenol resorcinol formaldehyde, an emulsion polymer isocyanate, and a one-component polyurethane adhesive. Contact angle data were also collected from the literature on polyethylene, polyvinyl chloride, polymethyl methacrylate, polystyrene, and Nylon 6. Contact angle analysis based on the Chang-Qin-Chen model was then applied to determine so-called acid-base interaction parameters and Wa between the wood samples and the selected thermoplastics and adhesives. Results show that the ageing process led to an increased hydrophobic character of unmodified, heat treated, and furfurylated wood samples. The freshly prepared acetylated wood samples had a pronounced hydrophobic character which remained approximately constant after ageing. The predicted Wa between the wood and the adhesives was considerably higher than that between the wood and the thermoplastics. Furthermore, the predicted Wa between the acetylated wood and both the thermoplastics and water was approximately unchanged when comparing the fresh and aged samples. In contrast, the ageing of all other wood samples resulted in a dramatic decrease of the wood-water Wa and a moderate decrease of the wood-thermoplastics Wa. The wood-adhesives Wa, however, was unchanged for the unmodified and furfurylated wood when comparing the fresh and aged samples and even increased for heat treated and acetylated wood samples.
©2010 by Walter de Gruyter Berlin New York
Artikel in diesem Heft
- Original Papers
- Interaction of dissolved and colloidal material during the mixing of different pulps
- Liquefaction behavior of Western red cedar and Japanese beech in the ionic liquid 1-ethyl-3-methylimidazolium chloride
- Ageing of modified wood. Part 1: Wetting properties of acetylated, furfurylated, and thermally modified wood
- Ageing of modified wood. Part 2: Determination of surface composition of acetylated, furfurylated, and thermally modified wood by XPS and ToF-SIMS
- Water sorption in wood and modified wood at high values of relative humidity. Part I: Results for untreated, acetylated, and furfurylated Norway spruce
- Water sorption in wood and modified wood at high values of relative humidity. Part 2: Appendix. Theoretical assessment of the amount of capillary water in wood microvoids
- Electron spectroscopy on plasma treated lignin and cellulose
- Tensile shear strength of UF- and MUF-bonded veneer related to data of adhesives and cell walls measured by nanoindentation
- Characterizing macro-voids of uncompressed mats and finished particleboard panels using response surface methodology and X-ray CT
- Mixed mode fracture testing of adhesively bonded wood specimens using a dual actuator load frame
- Application of non-symmetrical drying tests for assessment of drying behaviour of ntholo (Pseudolachnostylis maprounaefolia PAX)
- Automated measurement of vessel properties in birch and poplar wood
- Degradation of wood veneers by Fenton's reagents: Effects of wood constituents and low molecular weight phenolic compounds on hydrogen peroxide decomposition and wood tensile strength loss
- Growth of ZnO nanofilms on wood with improved photostability
- Termite-resistant heartwood. Effect of antioxidants on termite feeding deterrence and mortality
- Biological performance of copper azole-treated wood and wood-based composites
- Short Notes
- Kraft pulping of wood treated with carbon-based preservatives
- Decay resistance of wood treated with fluorinated waterproofing agents
- Meetings
- Meetings
Artikel in diesem Heft
- Original Papers
- Interaction of dissolved and colloidal material during the mixing of different pulps
- Liquefaction behavior of Western red cedar and Japanese beech in the ionic liquid 1-ethyl-3-methylimidazolium chloride
- Ageing of modified wood. Part 1: Wetting properties of acetylated, furfurylated, and thermally modified wood
- Ageing of modified wood. Part 2: Determination of surface composition of acetylated, furfurylated, and thermally modified wood by XPS and ToF-SIMS
- Water sorption in wood and modified wood at high values of relative humidity. Part I: Results for untreated, acetylated, and furfurylated Norway spruce
- Water sorption in wood and modified wood at high values of relative humidity. Part 2: Appendix. Theoretical assessment of the amount of capillary water in wood microvoids
- Electron spectroscopy on plasma treated lignin and cellulose
- Tensile shear strength of UF- and MUF-bonded veneer related to data of adhesives and cell walls measured by nanoindentation
- Characterizing macro-voids of uncompressed mats and finished particleboard panels using response surface methodology and X-ray CT
- Mixed mode fracture testing of adhesively bonded wood specimens using a dual actuator load frame
- Application of non-symmetrical drying tests for assessment of drying behaviour of ntholo (Pseudolachnostylis maprounaefolia PAX)
- Automated measurement of vessel properties in birch and poplar wood
- Degradation of wood veneers by Fenton's reagents: Effects of wood constituents and low molecular weight phenolic compounds on hydrogen peroxide decomposition and wood tensile strength loss
- Growth of ZnO nanofilms on wood with improved photostability
- Termite-resistant heartwood. Effect of antioxidants on termite feeding deterrence and mortality
- Biological performance of copper azole-treated wood and wood-based composites
- Short Notes
- Kraft pulping of wood treated with carbon-based preservatives
- Decay resistance of wood treated with fluorinated waterproofing agents
- Meetings
- Meetings
