Effect of treatments with 1,3-dimethylol-4,5-dihydroxy-ethyleneurea (DMDHEU) on the tensile properties of wood

Yanjun Xie, Andreas Krause, Holger Militz, Hrvoje Turkulin, Klaus Richter, Carsten Mai

Research output: Contribution to journalArticlepeer-review

71 Scopus citations

Abstract

The thin-veneer strip technique was applied to investigate the modifying effects of 1,3-dimethylol-4,5-dihydroxyethyleneurea (DMDHEU) on the tensile strength of wood. Pinewood veneers treated with solutions of DMDHEU alone and in combination with magnesium chloride (MgCl2) as a catalyst showed considerable strength losses of up to 50% in zero-span and up to 70% in finite-span testing modes. The higher strength losses in the latter case are due to hemicellulose degradation, which cannot be assessed in zero-span testing. Strength loss observed after treatment with DMDHEU and MgCl2 was approximately as high as the sum of the strength losses determined after individual treatments with MgCl2 or DMDHEU. Micrographs of veneers after finite-span testing revealed that catalysed DMDHEU treatment changed the predominant failure mode from interfibre fracture (in controls) to intrafibre fracture. The mechanism of strength loss resulting from treatment with DMDHEU is discussed.

Original languageEnglish
Pages (from-to)43-50
Number of pages8
JournalHolzforschung
Volume61
Issue number1
DOIs
StatePublished - 1 Jan 2007
Externally publishedYes

Keywords

  • Chemical modification
  • DMDHEU
  • Scanning electron microscopy
  • Tensile strength
  • Wood degradation

Fingerprint

Dive into the research topics of 'Effect of treatments with 1,3-dimethylol-4,5-dihydroxy-ethyleneurea (DMDHEU) on the tensile properties of wood'. Together they form a unique fingerprint.

Cite this