Impact of impregnation and bleaching on the surface hardness of oak (Quercus petraea L.) wood

Keskin H., Atar M., Yavuzcan H. G.

Journal of Applied Polymer Science, vol.93, no.2, pp.498-504, 2004 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 93 Issue: 2
  • Publication Date: 2004
  • Doi Number: 10.1002/app.20434
  • Journal Name: Journal of Applied Polymer Science
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.498-504
  • Gazi University Affiliated: Yes


The impact of impregnation and bleaching on the hardness of varnish layers on oak (Quercus petraea L.) wood was investigated. A number of solutions [sodium hydroxide (NaOH) and hydrogen peroxide (H2O2); NaOH, calcium hydroxide, and H2O2; NaOH, magnesium sulfate, and H2O2; sodium bisulfate and H2C 2O4 · 2H2; sodium silicate and H 2O2; and potassium permanganate, sodium bisulfate, and H2O2] were applied at a concentration of 18% to bleach both impregnated [Tanalith-CBC (T-CBC) or Imersol-WR 2000 (I-WR 2000)] and unimpregnated (natural) wood panels. Subsequently, a water-based varnish (WB) was coated over the samples, and the hardness of the varnished layers was determined in accordance with ASTM D 4366. Among the samples that were varnish-coated without bleaching, T-CBC/WB yielded the highest hardness (59.50), whereas I-WR 2000/WB exhibited the lowest (49.17). However, among the samples varnish-coated after bleaching, the highest (56.50) and lowest (40.83) varnish hardness values were obtained with T-CBC/solution 2/WB and I-WR 2000/solution 4/WB, respectively. All the chemicals used for the bleaching process reduced the surface hardness. However, after the varnish coating, except for solutions 4 and 6, all the solutions showed hardness values similar to those of varnish-coated natural (control) samples. © 2004 Wiley Periodicals, Inc.