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Modification of wood with silicon compounds. Treatment systems based on organic silicon compounds — a review

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Abstract

A wide variety of organo-silicon compounds has been described for application on wood. Some compounds such as organo-functional silanes which are mostly applied in combination with tetraalkoxysilanes (sol-gel process) as well as chlorosilanes and trimethylsilyl derivatives were proposed for a full impregnation treatment of wood. Other systems have been developed for surface treatment of wood such as plasma coating with hexametyldisiloxane and micro-emulsions which mainly contain silane/siloxane mixtures. The effects related to the various treatments vary from an increase in dimensional stability, durability and fire resistance to an enhanced hydrophobation of wood. In the cases of decay and fire resistance a combination of silicon based systems with other chemicals was required to obtain satisfactory results. Due to the excellent water repellent ability and weathering stability of some treatments, application of silicon treated wood under conditions of hazard class III (EN 335 outside above ground exposure) is recommended.

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Abbreviations

ASE:

anti-shrink efficiency

ATR-FT-IR:

attenuated total reflectance — Fourier transform infrared spectroscopy

CP MAS-NMR:

cross polarisation magic angle spinning nuclear magnetic resonance spectroscopy

DTA:

differential thermal analysis

DTMOS:

decyltrimethoxysilane

EDX:

energy dispersive x-ray analysis

EETMOS:

β-(3,4 epoxycyclohexyl) ethyl trimethoxysilane

EMC:

equilibrium moisture content

ESCA:

electron spectroscopy for chemical analysis

HFOETMOS:

2-heptadecafluorooctylethyltrimethoxysilane

HMDSO:

hexamethyldisiloxane

IPTEOS:

3-isocyanatepropyl triethoxysilane

MPTMOS:

γ-methacryloxypropyl trimethoxysilane

MTMOS:

methyltrimethoxysilane

PDMS:

polydimethylsiloxane

PTMOS:

propyltrimethoxysilane

TEOS:

tetraethoxysilane / triethyl orthosilicate

TFPTMOS:

3,3,3-trifluoropropyltrimethoxysilane

TGA:

thermo-gravimetric analysis

TMSAH:

3-(trimethoxysilyl)propyl (carboxymethyl) decylmethyl ammonium hydroxide inner salt

TMSCl:

trimethylsilyl chloride

TPT:

tetraisopropyl titanate

VTMOS:

vinyl trimethoxysilane

WPG:

weight percent gain

WRE:

water repellent efficiency

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Mai, C., Militz, H. Modification of wood with silicon compounds. Treatment systems based on organic silicon compounds — a review. Wood Sci Technol 37, 453–461 (2004). https://doi.org/10.1007/s00226-004-0225-9

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