Research activation energy in thermal modification of wood

The analysis of the process thermal modification wood, which was modified by a controlled pyrolysis wood heating (> 180 ° C) in absence oxygen, causes some chemical changes structures cell wall components (lignin, cellulose and hemicellulose), durability. It is proved that decomposition hemicelluloses amorphous part occurs, therefore amount substances are environment for development fungi significantly decreases. In addition, lignin formed pseudolignin undergo polymerization redistribution volume give walls greater density, hardness, increase hydrophobicity (water repellency), thereby reducing their ability to absorb moisture edema. Polymerized fills inner cavity cell, forming closed porous structure with low bind water. found most effective parameter such temperature exposure time. results thermogravimetric researches given, dependence weight loss on basis activation energy calculated defined. determining show hardwood species this value exceeds more than 1.5 times compared softwood.