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 |
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Rok vydání: | 2019 |
Předmět: |
040101 forestry
0106 biological sciences medicine.medical_treatment Covalent modification 04 agricultural and veterinary sciences Alkylation 01 natural sciences Benzoates Biomaterials Contact angle chemistry.chemical_compound chemistry Covalent bond 010608 biotechnology medicine 0401 agriculture forestry and fisheries Organic chemistry Veneer Mass fraction Derivative (chemistry) |
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 |
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