TY - JOUR
T1 - Chemistry and water-repelling properties of phenyl-incorporating wood composites
AU - Van Opdenbosch, Daniel
AU - Dorstein, Jog
AU - Klaithong, Somruedee
AU - Kornprobst, Tobias
AU - Plank, Johann
AU - Hietala, Sami
AU - Zollfrank, Cordt
N1 - Funding Information:
Acknowledgments: This work was performed as part of Project IX “Hierarchically structured porous ceramics and composites from nanocasting of plant cell walls” in the frame-work of the priority programme SPP1420 of the Deutsche Forschungsgemeinschaft (German Research Foundation). The grant of our project and the financial aid allocated to our work through SPP1420 is gratefully acknowledged.
PY - 2013/12
Y1 - 2013/12
N2 - The properties of materials are presented, which are resulting from a combined inorganic-organic modification of wood with phenyltrimethoxysilane or phenyltriethoxysilane in a simple one-step impregnation treatment. The permanent swelling of the wood showed that the precursors entered the cell walls. The inclusion of phenyl groups, manifest by nuclear magnetic resonance spectroscopy, made the resulting wood composites highly hydrophobic, as evidenced by their low wettability and antishrink efficiencies of up to 44%. Impedance spectroscopy indicated that wood methylol groups took part in the condensation reactions with hydrated siloxanes, contributing to the high hydrophobicity and making the added phase resistant to leaching. The composites exhibited high weight percentage gains of up to 52% and ash contents up to 19%. The thermal properties of precursor solutions and products were assessed by differential scanning calorimetry and thermogravimetric analysis and compared with the more common silica precursor, tetraethyl orthosilicate.
AB - The properties of materials are presented, which are resulting from a combined inorganic-organic modification of wood with phenyltrimethoxysilane or phenyltriethoxysilane in a simple one-step impregnation treatment. The permanent swelling of the wood showed that the precursors entered the cell walls. The inclusion of phenyl groups, manifest by nuclear magnetic resonance spectroscopy, made the resulting wood composites highly hydrophobic, as evidenced by their low wettability and antishrink efficiencies of up to 44%. Impedance spectroscopy indicated that wood methylol groups took part in the condensation reactions with hydrated siloxanes, contributing to the high hydrophobicity and making the added phase resistant to leaching. The composites exhibited high weight percentage gains of up to 52% and ash contents up to 19%. The thermal properties of precursor solutions and products were assessed by differential scanning calorimetry and thermogravimetric analysis and compared with the more common silica precursor, tetraethyl orthosilicate.
KW - 13C CPMAS
KW - 29Si solid-state NMR
KW - Differential scanning calorimetry (DSC)
KW - Differential thermal analysis (DTA)
KW - Electrical impedance spectroscopy (EIS)
KW - Hydrophobic wood
KW - Phenyl
KW - Phenyltriethoxysilane (PTEOS)
KW - Phenyltrimethoxysilane (PTMOS)
KW - Siloxane
KW - Tetraethyl orthosilicate (TEOS)
KW - Thermogravimetric analysis (TGA)
KW - Wood composite
UR - http://www.scopus.com/inward/record.url?scp=84888419976&partnerID=8YFLogxK
U2 - 10.1515/hf-2013-0011
DO - 10.1515/hf-2013-0011
M3 - Article
AN - SCOPUS:84888419976
SN - 0018-3830
VL - 67
SP - 931
EP - 940
JO - Holzforschung
JF - Holzforschung
IS - 8
ER -