iForest - Biogeosciences and Forestry


Changes in moisture exclusion efficiency and crystallinity of thermally modified wood with aging

Asghar Tarmian   , Akbar Mastouri

iForest - Biogeosciences and Forestry, Volume 12, Issue 1, Pages 92-97 (2019)
doi: https://doi.org/10.3832/ifor2723-011
Published: Jan 24, 2019 - Copyright © 2019 SISEF

Research Articles

This study aimed to investigate whether aging affects moisture exclusion efficiency and crystallinity of thermally modified wood. For this purpose, wood blocks of hornbeam (Carpinus betulus), Norway spruce (Picea abies) and oak (Quercus castanifolia), modified at 180 °C for 3 hours inside a ThermoWood kiln were exposed to a six-cycle artificial aging procedure. Aging reduced the efficiency and crystallinity of the modified woods. A significant negative correlation was found between the wood crystallinity and equilibrium moisture content (EMC) which indicates that change in the crystallinity index (CrI) measured by X-ray diffraction (XRD) affects the affinity of wood to moisture. The increased affinity of the modified wood to moisture after aging is probably due to the leaching of thermal degradation products as observed by Attenuated Total Reflectance Fourier Transform Infrared (ATR-FTIR) spectroscopy.


Aging, Crystallinity, Moisture Exclusion Efficiency, Thermally Modified Wood

Authors’ address

Asghar Tarmian
Akbar Mastouri
University of Tehran, Faculty of Natural Resources, Department of Wood and Paper Science and Technology, Tehran (Iran)

Corresponding author

Asghar Tarmian


Tarmian A, Mastouri A (2019). Changes in moisture exclusion efficiency and crystallinity of thermally modified wood with aging. iForest 12: 92-97. - doi: 10.3832/ifor2723-011

Academic Editor

Giacomo Goli

Paper history

Received: Jan 06, 2018
Accepted: Nov 10, 2018

First online: Jan 24, 2019
Publication Date: Feb 28, 2019
Publication Time: 2.50 months

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