Limits in reaching the anhydrous state of wood and cellulose

Michael Altgen*, Michael Fröba, Julius Gurr, Andreas Krause, Martin Ohlmeyer, Uta Sazama, Wim Willems, Martin Nopens

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
41 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)6247-6257
Number of pages11
JournalCellulose
Volume30
Issue number10
Early online date1 Jun 2023
DOIs
Publication statusPublished - Jul 2023
MoE publication typeA1 Journal article-refereed

Keywords

  • Automated sorption balance
  • Coulometric Karl-Fischer titration
  • Moisture content
  • Thermogravimetric analysis
  • Water vapor sorption

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