Characterization of a formaldehyde-free cornstarch-tannin wood adhesive for interior plywood

Amine Moubarik (1) , Ahmed Allal (1) , Antonio Pizzi (2) , Fatima Charrier (1) , Bertrand Charrier (1)

1 IPREM - Institut des sciences analytiques et de physico-chimie pour l'environnement et les materiaux
2 LERMAB - Laboratoire d'Etude et de Recherche sur le Matériau Bois

This study investigated the physical properties (rheological and thermogravimetric analysis) of cornstarch-tannin adhesives and the mechanical properties (dry tensile strength and 3-point bending strength) of plywood made using cornstarch-tannin adhesives. This adhesive was evaluated for its utility in interior plywood manufacture. The optimum cure temperature and cure time of cornstarch-tannin adhesives were 170°C and 4 min, respectively. Plywood bonded with formaldehyde-free cornstarch-tannin adhesive exhibited excellent mechanical properties comparable to commercially available phenol-formaldehyde plywood adhesives. It was found that cornstarch-tannin panels which do not contain formaldehyde and with an emission equal to that of heated but unbound wood can be obtained by the use of hexamethylenetetramine (hexamine) as hardener.

Mots clés: rheological and thermogravimetric analysis; cornstarch-tannin adhesives

Domaines: Chimie; Chimie théorique et/ou physique

Amine Moubarik, Ahmed Allal, Antonio Pizzi, Fatima Charrier, Bertrand Charrier. Characterization of a formaldehyde-free cornstarch-tannin wood adhesive for interior plywood. European Journal of Wood and Wood Products, 2009, 68 (4), pp.427-433. ⟨10.1007/s00107-009-0379-0⟩. ⟨hal-00568256⟩