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Holzforschung

International Journal of the Biology, Chemistry, Physics, and Technology of Wood

Editor-in-Chief: Faix, Oskar

Editorial Board Member: Daniel, Geoffrey / Militz, Holger / Rosenau, Thomas / Salmen, Lennart / Sixta, Herbert / Vuorinen, Tapani / Argyropoulos, Dimitris S. / Balakshin, Yu / Barnett, J. R. / Burgert, Ingo / Rio, Jose C. / Evans, Robert / Evtuguin, Dmitry V. / Frazier, Charles E. / Fukushima, Kazuhiko / Gindl-Altmutter, Wolfgang / Glasser, W. G. / Holmbom, Bjarne / Isogai, Akira / Kadla, John F. / Koch, Gerald / Lachenal, Dominique / Laine, Christiane / Mansfield, Shawn D. / Morrell, J.J. / Niemz, Peter / Potthast, Antje / Ragauskas, Arthur J. / Ralph, John / Rice, Robert W. / Salin, Jarl-Gunnar / Schmitt, Uwe / Schultz, Tor P. / Sipilä, Jussi / Takano, Toshiyuki / Tamminen, Tarja / Theliander, Hans / Welling, Johannes / Willför, Stefan / Yoshihara, Hiroshi

12 Issues per year


IMPACT FACTOR 2016: 1.868
5-year IMPACT FACTOR: 1.875

CiteScore 2016: 1.83

SCImago Journal Rank (SJR) 2015: 0.817
Source Normalized Impact per Paper (SNIP) 2015: 0.954

Online
ISSN
1437-434X
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In This Section
Volume 60, Issue 3 (May 2006)

Issues

Chemical reaction of alkoxysilane molecules in wood modified with silanol groups

Philippe Tingaut
  • Laboratoire de Chimie des Substances Végétales, Université Bordeaux 1, Talence, France
/ Oliver Weigenand
  • Institute of Wood Biology and Wood Technology, Georg-August-University Goettingen, Goettingen, Germany
/ Carsten Mai
  • Institute of Wood Biology and Wood Technology, Georg-August-University Goettingen, Goettingen, Germany
/ Holger Militz
  • Institute of Wood Biology and Wood Technology, Georg-August-University Goettingen, Goettingen, Germany
/ Gilles Sèbe
  • Laboratoire de Chimie des Substances Végétales, Université Bordeaux 1, Talence, France
Published Online: 2006-05-03 | DOI: https://doi.org/10.1515/HF.2006.044

Abstract

Chemical reaction between silanol-modified wood and methyltrimethoxysilane (MTMS) was carried out using two different approaches with dibutyltin dilaurate (DBTDL) or ethylamine (EtNH2) as catalysts. Modifications were characterised by Fourier-transform infrared (FTIR) spectroscopy, as well as solid-state 13C and 29Si cross-polarisation with magic-angle spinning nuclear magnetic resonance (CP-MAS NMR) spectroscopy and scanning electron microscopy-energy dispersive X-ray (SEM-EDX) analysis. Silanol-modified wood was obtained by carbamoylation reaction with 3-isocyanatopropyltriethoxysilane (IPTES) and subsequent hydrolysis of the triethoxysilane end groups. 29Si CP-MAS NMR spectroscopy indicated that SiOH groups existed mostly in the form of mono- and di-condensed structures in wood, whatever the level of modification (low or high). The attachment of methyltrimethoxysilane (MTMS) molecules to silanol sites was apparently achieved when ethylamine was used as a catalyst. The reacted MTMS remaining in wood was found to exist mostly in the form of polysiloxane polymers (or oligomers), as shown by 29Si CP-MAS NMR results. Reactions performed with unmodified wood were much less effective, thereby demonstrating the importance of the IPTES pre-treatment.

Keywords: alkoxysilanes; 13C and 29Si CP-MAS NMR; chemical modification; FTIR spectroscopy; SEM-EDX analysis; silanol groups; wood

About the article

Corresponding author. Laboratoire de Chimie des Substances Végétales, Université Bordeaux 1, 351 Cours de la Libération, 33405 Talence, France


Received: October 28, 2005

Accepted: February 23, 2006

Published Online: 2006-05-03

Published in Print: 2006-05-01


Citation Information: Holzforschung, ISSN (Online) 1437-434X, ISSN (Print) 0018-3830, DOI: https://doi.org/10.1515/HF.2006.044.

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