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Thermomechanical analysis and performance tests of some EPI wood adhesives

Lijun Qiao (Chemistry Department, University of Auckland, Auckland, New Zealand)
Allan J. Easteal (Chemistry Department, University of Auckland, Auckland, New Zealand)
Clive J. Bolt (Coatings & Resins International Ltd, Auckland, New Zealand.)
Philip K. Coveny (Coatings & Resins International Ltd, Auckland, New Zealand.)
Robert A. Franich (New Zealand Forest Research Institute, Rotorua, New Zealand.)

Pigment & Resin Technology

ISSN: 0369-9420

Article publication date: 1 August 2000

Abstract

Poly (vinyl acetate)‐based emulsion polymer/isocyanates (EPI) structural wood adhesives were prepared and their performance benchmark tested according to the specifications of the Japanese JAS‐111 standard. The changes of the glass transition temperature of the cured emulsions relative to unmodified poly(vinyl acetate) emulsion, measured using differential scanning calorimetry, indicated the chemical structure changes resulting from modification of poly(vinyl acetate) emulsion. The EPI adhesives showed excellent water resistance and near‐colourless gluelines in wood joints, ease of application and additional significant advantages over other types of wood adhesives. The performance test results are interpreted on the basis of the viscoelastic behaviour of free‐standing adhesive films. Other types of crosslinkers were used in the study to compare with the isocyanate hardeners.

Keywords

Citation

Qiao, L., Easteal, A.J., Bolt, C.J., Coveny, P.K. and Franich, R.A. (2000), "Thermomechanical analysis and performance tests of some EPI wood adhesives", Pigment & Resin Technology, Vol. 29 No. 4, pp. 229-237. https://doi.org/10.1108/03699420010339371

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MCB UP Ltd

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