Open AccessJustification of conditions of application of thermo modified veneer for protection of wooden products from moisture
Author(s) -
Yuriy Tsapko,
Oleksandra Horbachova,
Olga Bondarenko,
Serhiі Mazurchuk
Publication year - 2021
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/1164/1/012050
Subject(s) - hemicellulose , veneer , absorption of water , lignin , moisture , cellulose , materials science , composite material , pulp and paper industry , polymer , amorphous solid , thermal decomposition , water content , chemical engineering , chemistry , organic chemistry , geotechnical engineering , engineering
The analysis of the process of thermal modification of wood was carried out and it was found that the treatment causes chemical changes in the structures of wood components (lignin, cellulose and hemicellulose). It is proved that in the process of thermal modification there is a decomposition of hemicelluloses and amorphous part of cellulose, reduced water absorption, and also reduces the amount of substances that are the environment for the development of fungi, which leads to increased durability. In addition lignin and psevdolihnin formed by the process of polymerization and pererozpodilynyu in cell volume and cell walls provide higher density, hardness, increase the hydrophobicity (water repelling), thereby reducing their ability to absorb moisture and swell. It has been experimentally established that in comparison with unmodified veneer, which gained 22.41 % of moisture in two weeks, veneer modified at 250 and 280 °C gained 2.5 times less moisture - on average 8.6 %. It is established that with the increase of the modification temperature to 280 °C, the water absorption decreases more than twice. The results of the research will also allow to purposefully solve further problems on the creation of new methods of thermal modification of wood and the conditions of its operation at various sites.