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Improvement of the water resistance of poly(vinyl acetate) emulsion wood adhesive

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 June 2000

Abstract

Four different approaches were taken to improve the water resistance of poly(vinyl acetate) (PVAc) emulsion adhesives. The improved wood adhesives were tested according to the ISO 9020 standard. Tensile storage modulus (E’) and glass transition temperature of the polymer films were measured using dynamic mechanical thermal analysis to quantify the influence of different approaches on those variables. Gel fraction and swelling ratio of the polymer film were measured to evaluate internal crosslink density. The experimental results showed that blending melamine/urea/formaldehyde (MUF) resin with PVAc emulsions modified the water resistance considerably and the film had a high E’ since an interpenetrating network‐type structure was formed in the polymer. The advantages and limitations of each modification were assessed on the basis of comparison of the results.

Keywords

Citation

Qiao, L., Easteal, A.J., Bolt, C.J., Coveny, P.K. and Franich, R.A. (2000), "Improvement of the water resistance of poly(vinyl acetate) emulsion wood adhesive", Pigment & Resin Technology, Vol. 29 No. 3, pp. 152-158. https://doi.org/10.1108/03699420010334303

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MCB UP Ltd

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