Abstract
The sorption behaviour of extracted and un-extracted Scots pine (Pinus sylvestris L.) heartwood was analysed using dynamic vapour sorption apparatus. In addition to the sorption isotherm and hysteresis, the moisture increments and decrements were determined as well as the rate of sorption. Parallel exponential kinetics model was used for further analysis. The effect of cyclic humidity loading on the sorption characteristics was studied by exposing samples to ten repeated sorption cycles and by determining the amount of accessible hydroxyl (OH) groups before and after the cyclic humidity loading. Removal of extractives led to an increase in EMC both in adsorption and in desorption. Hysteresis decreased due to the removal of extractives. Cyclic humidity loading reduced the sorptive capacity of wood material for both extracted and un-extracted wood, but was more pronounced in un-extracted wood. However, despite the decrease in the sorptive capacity, the amount of accessible OH groups increased after ten repeated dry-humid cycles.
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Acknowledgement
The authors gratefully acknowledge the contribution made by M.Sc. (Tech.), Architect Jonna Silvo in the preparation of Fig. 1. The work leading to this manuscript was primarily financed by AEF—the Aalto Energy Efficiency Research Programme—under the auspices of the Wood Life project. The financial support provided by AEF is gratefully acknowledged by Katja Vahtikari, Tuula Noponen and Mark Hughes. Financial support from the Swedish Research Council Formas (Project EnWoBio 2014-172) is greatly acknowledged by Kristiina Lillqvist.
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The funding sources have not been involved in study design; in the collection, analysis or interpretation of data; in the writing of the report; nor in the decision to submit the article for publication. The authors declare that they have no conflict of interest.
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Vahtikari, K., Rautkari, L., Noponen, T. et al. The influence of extractives on the sorption characteristics of Scots pine (Pinus sylvestris L.). J Mater Sci 52, 10840–10852 (2017). https://doi.org/10.1007/s10853-017-1278-0
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DOI: https://doi.org/10.1007/s10853-017-1278-0