Limits in reaching the anhydrous state of wood and cellulose
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Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2023-07
Major/Subject
Mcode
Degree programme
Language
en
Pages
11
6247-6257
6247-6257
Series
Cellulose, Volume 30, issue 10
Abstract
Water-sorption studies and certain organic chemistry reactions require water removal from cellulosic samples. This is hindered by the strong interaction of cellulosic materials with water, and it remains uncertain if a completely anhydrous state can be reached under common drying conditions. Here, different drying conditions were applied to wood and cellulose, and the residual moisture contents were quantified either gravimetrically or by coulometric Karl-Fischer titration. Vacuum-drying at 103 °C and ≤ 1 mbar for at least 360 min decreased the moisture content to ≤ 0.04%. However, in automated sorption balances, drying at atmospheric pressure under dry air or nitrogen flow left some samples with more than 1% moisture content. The residual moisture content obtained under dry gas flow was temperature dependent. Increasing the temperature up to 55 °C decreased the residual moisture content and cooling resulted in a moisture re-uptake, presumably due to small quantities of water vapor in the surrounding atmosphere. These effects must be considered in fundamental studies on water interactions of cellulosic materials.Description
Open access funding provided by Norwegian Institute of Bioeconomy Research. The authors declare that no funds, grants, or other support were received during the preparation of this manuscript.
Keywords
Automated sorption balance, Coulometric Karl-Fischer titration, Moisture content, Thermogravimetric analysis, Water vapor sorption
Other note
Citation
Altgen , M , Fröba , M , Gurr , J , Krause , A , Ohlmeyer , M , Sazama , U , Willems , W & Nopens , M 2023 , ' Limits in reaching the anhydrous state of wood and cellulose ' , Cellulose , vol. 30 , no. 10 , pp. 6247-6257 . https://doi.org/10.1007/s10570-023-05293-7
