Laboratoire Sylvadour

Mont-de-Marsan, France

Laboratoire Sylvadour

Mont-de-Marsan, France
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Moubarik A.,Laboratoire Sylvadour | Moubarik A.,University of Pau and Pays de l'Adour | Causse N.,ENSIACET | Poumadere T.,ENSIACET | And 4 more authors.
Journal of Adhesion Science and Technology | Year: 2011

The aim of this work was to reduce the viscosity of formaldehyde-free corn starch-mimosa tannin wood adhesives, without adversely affecting the mechanical properties of the product. The reduction of viscosity was achieved using shear refinement. The study focused on the physical phenomena before cross-linking of the wood adhesive. The physical (rheological characterization) and mechanical (bond strength) properties of formaldehyde-free corn starch and mimosa tannin wood adhesives were measured. The results showed that the shear refinement (290 rpm and 5 min, optimal conditions) reduced the viscosity of the corn starch-mimosa tannin wood adhesives (from 100 000 to 458 Pa s) with the advantage of being stable over time. Mechanical tests showed that the shear refinement did not influence the mechanical properties of corn starch-mimosa tannin wood adhesives. © 2011 Koninklijke Brill NV, Leiden.


Surini T.,University of Bordeaux 1 | Charrier F.,Laboratoire Sylvadour | Malvestio J.,University of Bordeaux 1 | Charrier B.,Laboratoire Sylvadour | And 3 more authors.
Wood Science and Technology | Year: 2012

An original heat treatment performed under vacuum pressure was investigated. Maritime pine samples were treated at six different temperatures: 140, 160, 180, 200, 230 and 260°C. The physical and mechanical consequences, i.e. bending strength (MOR), modulus of elasticity (MOE), hygroscopic behaviour, equilibrium moisture contents and anti-swelling efficiency (ASE) were studied. A no-choice feeding test according to the NF EN 117 standard was achieved. Temperatures up to 200°C had no significant effect on wood properties. However, at 230 and 260°C, the decrease in MOR was severe, reaching 42.5 and 62.5%, respectively. Whatever the treatment conditions, wood samples were still highly degraded by termites, revealing no increase in their durability. © 2011 Springer-Verlag.

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