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For a durable improvement of the hydrophobization properties of wood Scots pine ( Pinus sylvestris  L.) sapwood veneer chips were covalently modified with surfactant-like  p -alkylated benzoates and a corresponding 4-cyanophenyl derivative. These esterification reactions of wood hydroxyl groups at varied temperatures and different reaction times afforded weight percent gains (WPG) ranging from 8 to 44% and quantities of covalently bonded organomaterials (QCO) of 0.3–2.6 mmol per gram, respectively. The successful covalent attachment of the functional precursors was proven by attenuated total reflection-infrared spectroscopy (ATR-IR), while the improvement of hydrophobicity was demonstrated by resulting contact angles (CAs) in a range from 113 to 150°.

holzforschung

Chemical improvement of surfaces. Part 5: surfactants as structural lead for wood hydrophobization – covalent modification with  p -alkylated benzoates