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Title: Informing the improvement of forest products durability using small angle neutron scattering

Journal Article · · Cellulose

A better understanding of how wood nanostructure swells with moisture is needed to accelerate the development of forest products with enhanced moisture durability. Despite its suitability to study nanostructures, small angle neutron scattering (SANS) remains an underutilized tool in forest products research. Nanoscale moisture-induced structural changes in intact and partially cut wood cell walls were investigated using SANS and a custom-built relative humidity (RH) chamber. SANS from intact wood sections cut from each primary wood orientation showed that although wood scattered anisotropically across 1.3–600 nm length scales, measurement of elementary fibril spacing and low-q surface scattering were independent of orientation. Water sorption caused spacing between elementary fibrils to increase with RH, and this swelling accounted for over half the transverse swelling in S2 secondary wood cell walls. Elementary fibril spacing in longitudinally cut wood cells, which were designed to mimic cells near wood-adhesive bondlines, was greater than the spacing in intact cells above 90 % RH. This suggested that some cell wall hoop constraint from the S1 and S3 cell wall layers on the S2 layer was released by cutting the cells. Furthermore, increased spacing between elementary fibrils may also create diffusion channels that are hypothesized to be responsible for the onset of fungal decay in wood. Finally, protocols were established to use SANS in future research to study adhesives and protection treatments to improve moisture durability in forest products.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1830154
Journal Information:
Cellulose, Vol. 23, Issue 3; ISSN 0969-0239
Publisher:
SpringerCopyright Statement
Country of Publication:
United States
Language:
English

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Kinetics of Water Vapor Sorption in Wood Cell Walls: State of the Art and Research Needs journal August 2019
Tension wood structure and morphology conducive for better enzymatic digestion journal February 2018
Small-angle scattering model for efficient characterization of wood nanostructure and moisture behaviour journal March 2019
Wood Moisture-Induced Swelling at the Cellular Scale—Ab Intra journal November 2019
On the Experimental Assessment of the Molecular-Scale Interactions between Wood and Water journal July 2019
In operando monitoring of wood transformation during pretreatment with ionic liquids text January 2020
Moisture-related changes in the nanostructure of woods studied with X-ray and neutron scattering journal October 2019
Effects of Moisture on Diffusion in Unmodified Wood Cell Walls: A Phenomenological Polymer Science Approach journal November 2019
Hygroscopic wood moisture: single and dimerized water molecules at hydroxyl-pair sites? journal March 2018
In operando monitoring of wood transformation during pretreatment with ionic liquids journal April 2020