Effect of drying and rewetting of wood on cellulose molecular packing
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Stefan J. Hill
Abstract
Drying and rewetting of Pinus radiata sapwood latewood was studied by synchrotron wide angle X-ray scattering in transmission mode. Scattering from cellulose was interpreted in terms of chains distributed on a monoclinic lattice. Drying wood material to below the fibre saturation point resulted in decreased spacing between adjacent cellulose polymers within the hydrogen-bonded sheets of chains, and also decreased the monoclinic angle. The changes were partly reversed when the dried wood was rewet, but accumulated through multiple cycles of oven-drying and rewetting. No changes were observed in the fibre repeat distance, thus the distortion of the crystal lattice was not attributed to mechanical stresses associated with drying. Instead, the changes were attributed to formation of intrachain hydrogen bonds at dehydrated crystallite surfaces, causing conformational changes within the cellulose chains and increasing the density of packing. The results help account for the hysteresis observed in moisture desorption-adsorption isotherms during wood material drying and rehydration.
©2010 by Walter de Gruyter Berlin New York
Articles in the same Issue
- Original Papers
- Pre-extraction of hemicelluloses and subsequent ASA and ASAM pulping: Comparison of autohydrolysis and alkaline extraction
- Effect of drying and rewetting of wood on cellulose molecular packing
- Determination of native (wood derived) formaldehyde by the desiccator method in particleboards generated during panel production
- A computational study of pyrolysis reactions of lignin model compounds
- Energy reduction of refining by cellulases
- Macro- and micro-mechanical properties of red oak wood (Quercus rubra L.) treated with hemicellulases
- Acoustic emission measurements and lattice simulations of microfracture events in spruce
- Impact of organosilicon treatments on the wood-water relationship of solid wood
- Analysis of the water vapour sorption behaviour of Sitka spruce [Picea sitchensis (Bongard) Carr.] based on the parallel exponential kinetics model
- Effects of modification with glutaraldehyde on the mechanical properties of wood
- Effect of glutaraldehyde on water related properties of solid wood
- Creep behavior of bamboo under various desorption conditions
- Predicting the longitudinal modulus of elasticity of Sitka spruce from cellulose orientation and abundance
- Examination of the mode I critical stress intensity factor of wood obtained by single-edge-notched bending test
- Potential Brazilian wood species for bows of string instruments
- Non-destructive assessment of green density and moisture condition in plantation-grown radiata pine (Pinus radiata D. Don.) by increment core measurements
- Development of wood decay in wound-initiated discolored wood of eastern red cedar
- The effects of subthreshold loadings of tebuconazole, DDAC, and boric acid on wood decay by Postia placenta
- Short Notes
- New aspects of residual lignin isolation
- Personalia
- Horst H. Nimz celebrated his 80th birthday on April 21st, 2010
- Meetings
- Meetings
Articles in the same Issue
- Original Papers
- Pre-extraction of hemicelluloses and subsequent ASA and ASAM pulping: Comparison of autohydrolysis and alkaline extraction
- Effect of drying and rewetting of wood on cellulose molecular packing
- Determination of native (wood derived) formaldehyde by the desiccator method in particleboards generated during panel production
- A computational study of pyrolysis reactions of lignin model compounds
- Energy reduction of refining by cellulases
- Macro- and micro-mechanical properties of red oak wood (Quercus rubra L.) treated with hemicellulases
- Acoustic emission measurements and lattice simulations of microfracture events in spruce
- Impact of organosilicon treatments on the wood-water relationship of solid wood
- Analysis of the water vapour sorption behaviour of Sitka spruce [Picea sitchensis (Bongard) Carr.] based on the parallel exponential kinetics model
- Effects of modification with glutaraldehyde on the mechanical properties of wood
- Effect of glutaraldehyde on water related properties of solid wood
- Creep behavior of bamboo under various desorption conditions
- Predicting the longitudinal modulus of elasticity of Sitka spruce from cellulose orientation and abundance
- Examination of the mode I critical stress intensity factor of wood obtained by single-edge-notched bending test
- Potential Brazilian wood species for bows of string instruments
- Non-destructive assessment of green density and moisture condition in plantation-grown radiata pine (Pinus radiata D. Don.) by increment core measurements
- Development of wood decay in wound-initiated discolored wood of eastern red cedar
- The effects of subthreshold loadings of tebuconazole, DDAC, and boric acid on wood decay by Postia placenta
- Short Notes
- New aspects of residual lignin isolation
- Personalia
- Horst H. Nimz celebrated his 80th birthday on April 21st, 2010
- Meetings
- Meetings
