Journal
HOLZFORSCHUNG
Volume 57, Issue 3, Pages 301-307Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/HF.2003.045
Keywords
wettability; contact angle; heat-treated wood; chemical modification
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The aim of this work was to study the wettability and chemical composition of heat-treated wood. Heat treatment was performed at 240degreesC under inert atmosphere on four European wood species (pine, spruce, beech and poplar). Contact angle measurements before and after treatment indicated a significant increase in wood hydrophobicity. Advancing contact angles of a water drop were in all cases systematically higher for heat-treated than for untreated wood. Chemical modifications of wood after heat treatment were investigated using FTIR and C-13 NMR analysis. FTIR spectra indicated little structural change which could be attributed either to carbon-carbon double bond formation or to adsorbed water. NMR spectra also revealed little chemical change except for the degree of cellulose crystallinity which was considerably higher in heat-treated wood and could explain the higher contact angles.
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