Thermal stability of structural one-component polyurethane adhesives for wood-structure-property relationship

K. Richter, A. Pizzi, A. Despres

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

The relationship between the chemical structure of commercial polyurethanes and temperature-dependent creep properties was determined in full scale tests and the results were compared with thermomechanical analysis. Comparison of mechanical performance with 13C-NMR spectroscopy studies elucidated important structure-property relationships, which either allow the reduction or elimination of temperature-dependent creep in one-component polyurethanes (1C-PUR) adhesives for wood. The combination of the relative content of still reactive, free -NCO groups on the polyurethane, careful selection of the degree of resin polymerization and a slower rate of reaction are the three most significant parameters that have to be controlled to overcome the problem of temperature-dependent creep found in IC-PUR adhesives. The results obtained indicate that adhesives presenting a combination of a higher content of still unreacted -NCO groups, a lower degree of polymerization and slower reaction rate are capable to counteract problems of high sensitivity of polyurethane to temperature-dependent creep. Two commercial polyurethanes that fulfil the latter requirements and exhibit almost no creep were identified and characterized.

Original languageEnglish
Pages (from-to)5698-5707
Number of pages10
JournalJournal of Applied Polymer Science
Volume102
Issue number6
DOIs
StatePublished - 15 Dec 2006
Externally publishedYes

Keywords

  • Creep
  • NMR
  • Polyurethane
  • Structure property relationship
  • Wood adhesive

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