Swelling of acetylated wood I. Swelling in organic liquids

Eiichi Obataya (1) , Joseph Gril (2)

1 Institute of Wood Technology
2 MAB - Mécanique de l'Arbre et du Bois

To investigate the affinity of acetylated wood for organic liquids, Yezo spruce wood specimens were acetylated with acetic anhydride, and their swelling in various liquids were compared to those of untreated specimens. The acetylated wood was rapidly and remarkably swollen in aprotic organic liquids such as benzene and toluene in which the untreated wood was swollen only slightly and/or very slowly. On the other hand, the swelling of wood in water, ethylene glycol and alcohols remained unchanged or decreased by the acetylation. Consequently the maximum volume of wood swollen in organic liquids was always larger than that in water. The effect of acetylation on the maximum swollen volume of wood was greater in liquids having smaller solubility parameters. The easier penetration of aprotic organic liquids into the acetylated wood was considered to be due to the scission of hydrogen bonds among the amorphous wood constituents by the substitution of hydroxyl groups with hydrophobic acetyl groups.

Mots clés: Acetylation; swelling; organic liquid; solubility parameter

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

Eiichi Obataya, Joseph Gril. Swelling of acetylated wood I. Swelling in organic liquids. Journal of Wood Science, 2005, 51 (2), pp.124-129. ⟨10.1007/s10086-004-0634-2⟩. ⟨hal-00546630⟩