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Natural Tannins for Cold-Setting Wood Adhesives

  • Antonio Pizzi

Abstract

Flavonoid tannins, from the bark and wood of trees such as Acacia mearnsii and Pinus radiata, being phenolic in nature, undergo the same well-known reaction of phenols with formaldehyde either base- or acid- catalysed, weakly basic base-catalysed reactions being predominantly used in industrial applications. Increasingly alkaline conditions lead to progressive activation of the phenol as nucleophile, especially above pH 8 where phenate ions are formed.

Keywords

Reactive Position Methylene Bridge Liquid Resin Simultaneous Synthesis Tannin Adhesive 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. 1.
    A. Pizzi and H.O. Scharfetter, J. Appi. Polym, Sci., 22, 1745 (1978).Google Scholar
  2. 2.
    H.O. Scharfetter, A. Pizzi and D. du T. Rossouw, IUFRO Conference on Wood Gluing, Merida, Venezuela, Oct. 1977.Google Scholar
  3. 3.
    D.G. Roux, D. Ferreira, H.K.L. Hundt and E. Malan, Appl. Polym. Symp. No. 28, 335 (1975).Google Scholar
  4. 4.
    A. Pizzi and D.G. Roux, J. Appi. Polym. Sci., 22, 145 (1978).Google Scholar
  5. 5.
    A. Pizzi, Adhesives Age, 20, 12, 27 (1977).Google Scholar
  6. 6.
    A. Pizzi and D.G. Roux, J. Appi. Polym. Sci., 22, 2717 (1978).CrossRefGoogle Scholar
  7. 7.
    A. Pizzi, J. Appi. Polym. Sci., 23, 2999 (1979).CrossRefGoogle Scholar
  8. 8.
    F.W. Herrick and R.J. Conca, For. Prod. J., 10, 7, 361 (1960).Google Scholar
  9. 9.
    K. Freudenberg and J.M.A. DeLama, Ann. Chem., 612, 78 (1958).Google Scholar
  10. 10.
    A. Pizzi and G.M.E. Daling, J. Appi. Polym. Sci., 25, 1039 (1980).CrossRefGoogle Scholar

Copyright information

© Plenum Press, New York 1986

Authors and Affiliations

  • Antonio Pizzi
    • 1
  1. 1.National Timber Research InstituteCSIRPretoriaSouth Africa

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