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

Autor: Christian Kaldun, Jan C. Namyslo, Dieter E. Kaufmann, Martin Söftje
Rok vydání: 2019
Předmět:
Zdroj: Holzforschung. 74:703-713
ISSN: 1437-434X
0018-3830
DOI: 10.1515/hf-2019-0196
Popis: 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°.
Databáze: OpenAIRE