Modified Wood

Wood, Modified

 

wood that has been processed by some chemical substance (synthetic resin, ammonia, and so on) to improve its mechanical properties and impart water resistance to it. In most cases the wood is impregnated under pressure; polymerization or polycondensation of the chemical substances introduced into the wood (mers, oligomers, and others) is brought about by heat treatment or by irradiation with X rays and alpha, beta, and gamma rays in the presence of catalysts. Modified wood has 75 percent greater resistance to static bending than natural wood; it absorbs 3-5 times less water and is less susceptible to abrasive wear by a factor of 1.5-2.0. Modified wood is used to manufacture sliding bearings in units of farm machinery, parts that operate in aggressive mediums, and casting patterns and master forms.

REFERENCES

Rogovin, Z. A. Khimicheskie prevrashcheniia i modifikatsiia tselliulozy. Moscow, 1967.
Modifikatsiia drevesiny (collection of articles). Riga, 1967.

A. KALNIŅŠ

References in periodicals archive ?
"The zoomed in image attached shows the white mycelium mass of the pathogen and the modified wood that can be pulled apart by hand due to its spongy like consistency.
Preliminary research on the biological resistance of thermally modified wood. In: Abstracts of the First European Conference on Wood Modification, April 3-4, 2003, Ghent, Belgium: Univ.
Alem do livro de Hill (2006), mencionam-se duas obras sobre modificacao termica da madeira: ThermoWood[R] Handbook (INTERNATIONAL THERMOWOOD ASSOCIATION, 2003) e Processes and properties of thermally modified wood manufactured in Europe (MILITZ; ALTGEN, 2014).
National contract notice: animal experiments on the effects of modified wood fiber on ruminants
The complete data matrix from eight specimens of naturally seasoned and kilndried groups and four specimens of thermally modified wood contained 1,875,840 observations and 288 variables (spectral bands) as measured parameters.
Rowell, "Effect of humidity on vibrational properties of chemically modified wood," Wood and Fiber Science, vol.
Physical and biological properties of modified wood before and after weathering.
has reported an improvement in dimensional stability, flame resistance and hardness by incorporating nano Si[O.sub.2] into the urea formaldehyde modified wood [21].
The results show that it is feasible to fabricate wood-based luminescent nanocomposites using microwave modified wood and nanophosphor powders.

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