Research activation energy in thermal modification of wood

Yuriy Tsapko,Oleksandra Horbachova,Olga Bondarenko,Serhii Mazurchuk,Nataliya Buyskikh,S Semerikov,A Iatsyshyn,S Chukharev,T Vakaliuk,S Sakhno,H Danylchuk,P Nechypurenko,A Striuk,V Osadchyi,O Bondarenko,S Klimov

doi:10.1051/e3sconf/202128007009

Yuriy Tsapko, Oleksandra Horbachova + Show 14 more

Open Access

https://doi.org/10.1051/e3sconf/202128007009

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Abstract

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

Highlights

Wood, as a building material, is widely used in construction and architecture due to its mechanical and operational properties
Due to the fact that these materials are sensitive to moisture and biological damage, ie the ability to maintain functional properties under operating conditions
In the temperature range 180-250 oC, the temperature range often used for heat treatment, wood undergoes important chemical transformation

Summary

Introduction

As a building material, is widely used in construction and architecture due to its mechanical and operational properties. Due to the fact that these materials are sensitive to moisture and biological damage, ie the ability to maintain functional properties under operating conditions. It is possible to increase the level of operation of facilities that use building structures made of wood. The modification of wood difficulties for the application of technological modes like time, temperature. This is primarily due to the fact that the structure and composition of wood are different and the modification process is not achieved, and the use of thermodified wood leads to its destruction [1]

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