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Acceleration of the cure of phenolic resin adhesives VII: Influence of extractives of merbau wood on bonding


The influence of merbau wood extractives on the gelation rate of a phenolic adhesive and the effects of some cure accelerators on the bond performance of merbau plywood were investigated. The addition of merbau wood extractives slightly increased the gelation rate of the phenolic resin. This increase in the gelation rate was revealed to be due to a fall in the resin pH caused by addition of the extractives. The addition of cure accelerators, sodium carbonate and propylene carbonate, caused a considerable reduction in the hot-pressing time required for the merbau plywood to achieve sufficient bond qualities. Brushing veneer surfaces caused an increase in bond qualities. The combination of the cure acceleration and the surface brushing greatly improved the bondability of merbau wood. The main factor of gluing difficulty is considered to be the poor wettability of the veneer surfaces resulted from the accumulation of migrating extractives.


  1. 1.

    Hayashi Y, Yasue M, Takahashi T (1970) Extractives of Intsia wood (in Japanese). In: 20th Japan Wood Research Society Meeting Preprints, p 227

  2. 2.

    Imamura H, Fushiki H, Ishihara S, Ohashi H (1972) phenolic constituents of Merbau wood (Intsia sp.) and the specks on board (in Japanese). Bull Agric Div Gifu Univ 33:99–104

    Google Scholar 

  3. 3.

    Hillis WE, Yazaki Y (1973) Polyphenols of Intsia heartwoods. Phytochemistry 12:2491–2495

    CAS  Article  Google Scholar 

  4. 4.

    Imamura H, Takahashi T, Yasue M, Yagishita M, Karasawa H, Kawamura J (1970) Extractives on gluing and coating of Kapur wood (in Japanese). Bull Govt For Exp Sta 232:65–96

    Google Scholar 

  5. 5.

    Abe I, Akimoto N (1976) The inhibitory effect of Kapur wood extractives on the curing reaction of the resol (in Japanese). Mokuzai Gakkaishi 22:191–196

    Google Scholar 

  6. 6.

    Yazaki Y, Collins PJ, Iwashina T (1993) Extractives from blackbutt (Eucalyptus pilularis) wood which affect gluebond quality of phenolic resins. Holzforschung 47:415–418

    Google Scholar 

  7. 7.

    Lavisci P, Masson D, Deglise X (1991) Quality of turkey oak (Quercus cerris L.) wood: II. Analysis of some physico-chemical parameters related to its gluability. Holzforschung 45:415–418

    CAS  Article  Google Scholar 

  8. 8.

    Plomley KF, Hillis WE, Hirst K (1976) The influence of wood extractives on the glue-wood bond: I. The effect of kind and amount of commercial tannins and crude wood extracts on phenolic bonding. Holzforschung 30:14–19

    Article  Google Scholar 

  9. 9.

    Abe I, Ono K (1980) Effect of the acidity of some tropical wood extractives on the curing of the resol. Mokuzai Gakkaishi 26:686–692

    CAS  Google Scholar 

  10. 10.

    Chen CM (1970) Effect of extractive removal on adhesion and wettability of some tropical woods. For Prod J 20:36–41

    CAS  Google Scholar 

  11. 11.

    Inoue A, Ono H, Ohguro A, Karasawa H (1989) Improvement in gluability of veneer surface by wire-brushing (in Japanese). In: Nihon Mokuzai Kako Gijutsu Kyokai 7th annual meeting preprints, pp 48–49

  12. 12.

    Higuchi M, Tohmura S (1994) Acceleration of the cure of phenolic resin adhesives: V. Catalytic actions of carbonates and formamide. Mokuzai Gakkaishi 40:604–611

    CAS  Google Scholar 

  13. 13.

    Tohmura S, Higuchi M (1995) Acceleration of the cure of phenolic resin adhesives: VI. Cure-accelerating action of propylene carbonate. Mokuzai Gakkaishi 41:1109–1114

    CAS  Google Scholar 

  14. 14.

    Tohmura S, Higuchi M, Sakata I (1992) Acceleration of the cure of phenolic resin adhesives: II. Kinetics of curing reaction (1). Mokuzai Gakkaishi 38:59–66

    CAS  Google Scholar 

  15. 15.

    Tohmura S, Higuchi M, Sakata I (1993) Acceleration of the cure of phenolic resin adhesives: III. Kinetics of curing reaction (2). Mokuzai Gakkaishi 39:650–657

    CAS  Google Scholar 

  16. 16.

    Hse CY, Kuo M (1988) Influence of extractives on wood gluing and finishing — a review. For Prod J 38:52–56

    CAS  Google Scholar 

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Correspondence to Shin-ichiro Tohmura.

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Tohmura, S. Acceleration of the cure of phenolic resin adhesives VII: Influence of extractives of merbau wood on bonding. J Wood Sci 44, 211–216 (1998).

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Key words

  • Phenolic resin
  • Cure-acceleration
  • Extractives
  • Merbau