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Behaviour of Solid Wood and Bound Water as a Function of Moisture Content. A Proton Magnetic Resonance Study by Cynthia D. Araujo; Stavros Avramidis; Alexander L. MacKay is a Engineering article available to read on EtoBox.

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Nuclear magnetic resonance lineshape second moments of the solid wood protons and spin-spin relaxation times, ?2, of the bound water in lodgepole pine heartwood have been measured at 30°C for a ränge of moisture Contents, mainly in the hygroscopic ränge. The second moment of the solid wood protons for oven dry wood was found to be about 23% lower than the rigid lattice calculation, indicative of a rigid struclure with some anisotropic molecular motion of the polymeric constituents. Above 5% M, the second moment decreased by a further 13 to 16% implying a "loosening" of the molecules in the solid with increased moisture content. The 7\*2 of the bound water increased with moisture content, and provided no evidence of separate hydration and solution water fractions äs predicted by isotherm theories. The NMR measured fibre Saturation point of 27% agreed with the value calculated by the Hailwood-Horrobin isotherm model.

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Author

Cynthia D. Araujo; Stavros Avramidis; Alexander L. MacKay

Publisher

Walter de Gruyter GmbH

Published

1994

Language

EN

Field

Engineering (Physical Sciences)