Water accessibility to hydroxyls confined in solid wood cell walls

Springer Science and Business Media LLC - Tập 27 - Trang 5617-5627 - 2020
Emil Engelund Thybring1,2,3, Sara Piqueras1, Asghar Tarmian4, Ingo Burgert2,3
1Department of Geosciences and Natural Resource Management, University of Copenhagen, Frederiksberg C, Denmark
2Institute for Building Materials, Wood Materials Science, ETH Zürich, Zürich, Switzerland
3Cellulose and Wood Materials Laboratory, Empa, Dübendorf, Switzerland
4Department of Wood and Paper Science and Technology, University of Tehran, Karaj, Iran

Tóm tắt

The hydrophilicity of wood cell walls derives from the presence of hydroxyls, but their accessibility is restricted by physical confinement from the stiff, solid cell walls. This study examines how this confinement affects water uptake of the accessible hydroxyls by tuning their amount through replacement with various non-hydrophilic functional groups. Results from gravimetrically determined hydroxyl accessibility by deuterium exchange are shown not to correlate with moisture uptake in cell walls under vapour conditions or at water-saturation. Instead, spatial availability for water inside solid cell walls is suggested as the dominant factor in controlling cell wall moisture uptake at given climatic conditions.

Tài liệu tham khảo

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