Working Paper Article Version 1 This version is not peer-reviewed

Evaluation of the Dimensional Stability of Black Poplar Wood Modified Thermally in Nitrogen Atmosphere

Version 1 : Received: 25 February 2021 / Approved: 26 February 2021 / Online: 26 February 2021 (10:53:16 CET)

A peer-reviewed article of this Preprint also exists.

Bytner, O.; Laskowska, A.; Drożdżek, M.; Kozakiewicz, P.; Zawadzki, J. Evaluation of the Dimensional Stability of Black Poplar Wood Modified Thermally in Nitrogen Atmosphere. Materials 2021, 14, 1491. Bytner, O.; Laskowska, A.; Drożdżek, M.; Kozakiewicz, P.; Zawadzki, J. Evaluation of the Dimensional Stability of Black Poplar Wood Modified Thermally in Nitrogen Atmosphere. Materials 2021, 14, 1491.

Journal reference: Materials 2021, 14, 1491
DOI: 10.3390/ma14061491

Abstract

Black poplar (Populus nigra L.) was thermally modified in nitrogen atmosphere. Treatment in nitrogen atmosphere can improve the dimensional stability of black poplar. The effects of the modification process on poplar wood were evaluated for temperatures: 160 °C, 190 °C, and 220 °C applied for 2 h; and 160 °C and 190 °C for 6 h. The percentual impact of temperature and time of modification on the properties of modified wood was analysed. The study permitted to identify correlations between the chemical composition and selected physical properties of thermally modified poplar wood. The dimensional stability of poplar wood improves after thermal modification in nitrogen. The higher the temperature of modification, the lower the equilibrium moisture content (EMC) of black poplar. At the temperature of 220 °C, EMC was two times lower than the EMC of non-modified black poplar. It is also possible to reduce the dimensional changes of wood two-fold (at the modification temperature of 220 °C), both in radial and tangential directions, independently of the acclimatisation conditions (from 34% to 98% RH). Similar correlations have been found for wood that has been soaked in water. Higher modification temperatures and longer processing times contributed to a lower swelling anisotropy (SA).

Keywords

black poplar; dimensional stability; factor influence; nitrogen atmosphere; thermal modification

Subject

MATERIALS SCIENCE, Biomaterials

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