End-grained wood-polyurethane composites, 1 synthesis, morphology and characterization

Olivier Persenaire, Michaël Alexandre, Philippe Degée, René Pirard, Philippe Dubois

Research output: Contribution to journalArticle

Abstract

In order to improve the dimensional stability of end-grained wood upon environmental humidity variations, a two-step procedure was thoroughly studied which involved the osmotic impregnation of native poplar wood by PEG, followed by the reactive impregnation with HMDI, leading to polymer chain extension and polyurethane formation. It came out that the efficiency of PEG and/or polyurethane grafting within ligno-cellulosic cell walls was intimately related to parameters such as concentration of the PEG impregnation bath, PEG molar mass, time and temperature of impregnation steps. Based on the different sample characterizations, Soxhlet extraction and density measurements, it came out that adequate experimental conditions are to carry out osmotic impregnation at 20 °C for 24 h starting from an aqueous solution of PEG ([PEG] = 0.5 mol · L-1 and M̄nPEG = 400 or 1 000) and reactive impregnation in bulk with a large excess of HMDI at 20 °C for 2 h. Combining scanning electron microscopy and mercury porosimetry demonstrated the selective impregnation of cell wall and wood rays which were collapsed in native wood and expanded in wood polyurethane composites.

Original languageEnglish
Pages (from-to)895-902
Number of pages8
JournalMacromolecular Materials and Engineering
Volume289
Issue number10
DOIs
Publication statusPublished - 20 Oct 2004
Externally publishedYes

Keywords

  • Composites
  • End-grained wood
  • Impregnation
  • Morphology
  • Polyurethanes

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