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Chemical reaction of alkoxysilane molecules in wood modified with silanol groups

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Published/Copyright: May 3, 2006
Holzforschung
From the journal Volume 60 Issue 3

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

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Published Online: 2006-05-03
Published in Print: 2006-05-01

©2006 by Walter de Gruyter Berlin New York

Articles in the same Issue

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  8. Chemical reaction of alkoxysilane molecules in wood modified with silanol groups
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https://doi.org/10.1515/HF.2006.044
Keywords for this article
alkoxysilanes; 13C and 29Si CP-MAS NMR; chemical modification; FTIR spectroscopy; SEM-EDX analysis; silanol groups; wood

Articles in the same Issue

  1. Brightness stabilisation of bleached high-yield pulps by novel sulfur-containing inhibitors
  2. Application of UV-Vis and resonance Raman spectroscopy to study bleaching and photoyellowing of thermomechanical pulps
  3. Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery
  4. Effect of poly(ethylene oxide) molecular mass on miscibility and hydrogen bonding with lignin
  5. Calculation of the relative bonded area and scattering coefficient from sheet density and fibre shape
  6. Formic and acetic acids in archaeological wood. A comparison between the Vasa Warship, the Bremen Cog, the Oberländer Boat and the Danish Viking Ships
  7. Time-domain 1H NMR characterization of the liquid phase in greenwood
  8. Chemical reaction of alkoxysilane molecules in wood modified with silanol groups
  9. Dimensional stability of MDF panels produced from heat-treated fibres
  10. Multivariate modeling of MDF panel properties in relation to wood fiber characteristics
  11. Viscoelastic behaviour of solid wood under compressive loading
  12. The creep of wood destabilized by change in moisture content. Part 3: The influence of changing moisture history on creep behavior
  13. Air permeability of aspen veneer and glueline: Experimentation and implications
  14. Fracture cleavage analysis of PVAc latex adhesives: Influence of phenolic additives
  15. Effect of a waterproof agent on gypsum particleboard properties
  16. Effects of semi-isostatic densification on anatomy and cell-shape recovery on soaking
  17. Analytical tools to predict changes in properties of oriented strandboard exposed to the fungus Postia placenta
  18. The effect of CaCl2 on growth rate, wood decay and oxalic acid accumulation in Serpula lacrymans and related brown-rot fungi
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