Surface properties of tannin treated wood during natural and artificial weathering

G. Tondi, T. Schnabel, S. Wieland, A. Petutschnigg

Research output: Contribution to journalArticlepeer-review

Abstract

Tannins are the natural substances that plants use to protect wood. Novel tannin based formulations were tested to evaluate their efficacy in preventing weathering degradation of the surfaces. Scots pine and European beech specimens were treated with flavonoid based wood preservatives and exposed to artificial and natural weathering. The surface properties of the samples before and after weathering were evaluated using contact angle and colour measurements. Tannin treated samples showed a moderate resistance against discoloration and greater wettability than untreated samples. ATR-FT-MIR and FT-NIR spectroscopies combined with principal component analysis (PCA) revealed that weathering mainly degrades the aromatic component of wood. Because the protective tannin network is nothing more than an aromatic polymer, it suffers a similar degradation of lignin. Although the higher amount of aromatics leads to higher degradations, it is still possible to observe via vibrational spectroscopies that the flavonoid enriched surfaces contain more aromatics also after weathering. © 2013 IWSc, the Wood Technology Society of the Institute of Materials, Minerals and Mining.
Original languageEnglish
Pages (from-to)150-157
Number of pages8
JournalInternational Wood Products Journal
Volume4
Issue number3
DOIs
Publication statusPublished - 2013

Keywords

  • CIELAB
  • Contact angle
  • Tannin
  • Vibrational spectroscopy
  • Wood preservative
  • Aromatic components
  • Artificial weathering
  • CIELab
  • Colour measurement
  • European beech
  • FT-NIR spectroscopy
  • Natural weathering
  • Wood preservatives
  • Aromatization
  • Forestry
  • Near infrared spectroscopy
  • Principal component analysis
  • Protective coatings
  • Surface properties
  • Tannins
  • Weathering
  • Wood preservation
  • Flavonoids
  • Contact Angle
  • Infrared Spectroscopy
  • Protective Coatings
  • Surface Properties
  • Wood Preservatives

Classification according to Österreichische Systematik der Wissenschaftszweige (ÖFOS 2012)

  • 205008 Wood technology

Applied Research Level (ARL)

  • ARL Level 4 - Experimental setup in laboratory-like conditions

Research focus/foci

  • Sustainable Materials and Technologies

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