Effects of water re-saturation conditions and associated extractives leaching on thermal softening of wet wood

Iris Brémaud (1, 2, 3) , Sandrine Bardet (2, 1) , Joseph Gril (2, 1) , Patrick Perre (4, 3)

1 BOIS - Bois
2 LMGC - Laboratoire de Mécanique et Génie Civil
3 LERFoB - Laboratoire d'Etudes des Ressources Forêt-Bois
4 LGPM - Laboratoire de Génie des Procédés et Matériaux - EA 4038

Thermal softening, or thermo-activated viscoelasticity, is involved in several industrial and/or traditional craftsmanship techniques processing of wood. More fundamentally, it represents a very useful probe of chemical differences and/or of physical histories of wood samples [1,2,3,4,5]. Thermal softening of wet (= water-saturated) wood occurs at much lower temperature than that of completely (anhydrous) dried wood [6,7]. Softening of oven-dry wood happens at temperatures above 150°C, a temperature level at which wood amorphous polymers start to degrade [3,8]. Therefore, the characterisation of wet wood is the unique method that allows thermal softening to be distinguished from thermal degradation.

Mots clés: DMA; Destabilization; Glass transition; Hardwood; Specimens' histories; Transitional effects; Time; Extractives; Dynamic mechanical properties

Domaines: Matériaux; Mécanique des matériaux [physics.class-ph]; Thermique [physics.class-ph]

Iris Brémaud, Sandrine Bardet, Joseph Gril, Patrick Perre. Effects of water re-saturation conditions and associated extractives leaching on thermal softening of wet wood. Final Conference of COST Action FP0904 “Thermo-Hydro-Mechanical Wood Behaviour and Processing, May 2014, Skellefteå, Sweden. pp.8-9. ⟨hal-01085279⟩