PEG bulking of wood cell walls as affected by moisture content and nature of solvent |
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Authors: | Dragica Jeremic Paul Cooper Darrick Heyd |
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Institution: | (1) Faculty of Forestry, University of Toronto, 33 Willcocks Street, M5S 3B3 Toronto, ON, Canada;(2) Department of Chemistry and Biology, Ryerson Polytechnic University, 350 Victoria Street, M5B 2K3 Toronto, ON, Canada |
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Abstract: | Movement of polyethylene glycol (PEG) 1000 from wood cell lumens into adjacent cell walls was studied for different cell wall
moisture contents (MCs) and PEG solvents; relative amounts of PEG that penetrated into the cell walls were estimated by Raman
microscopy. It was shown that samples treated with PEG from chloroform solution adsorb less PEG than samples treated with
PEG-water solution even in the case of samples with open cell wall structure near fibre saturation point MC. Reconditioning
of PEG-chloroform treated samples at high relative humidities enhanced PEG bulking of cell walls, but not to the maximum amounts
observed with PEG-water treatments. Raman microscopy was a useful tool for estimating relative PEG amounts in the cell walls. |
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