CELL WALL DOMAIN AND MOISTURE CONTENT INFLUENCE SOUTHERN PINE ELECTRICAL CONDUCTIVITY

Samuel L. Zelinka, Leandro Passarini, Jose Colon Quintana, Samuel V. Glass, Joseph E. Jakes, Alex C. Wiedenhoeft

Abstract


Recent work has highlighted the importance of movement of chemicals and ions through the wood cell wall.  Movement depends strongly on moisture content and is necessary for structural damage mechanisms such as fastener corrosion and wood decay.  Here we present the first measurements of electrical resistance of southern pine at the subcellular level as a function of wood moisture content by using a 1 µm diameter probe.  Measurements were taken with the probe contacting the S2 layer of the cell wall and the cell corner compound middle lamella in the latewood and the cell corner compound middle lamella in the earlywood.  The resistance decreased with increasing relative humidity in all locations.  The resistance decreased more rapidly with relative humidity in the S2 layer than in any of the middle lamellae.  These results give insight into how some moisture-dependent wood properties affecting ion movement may be partitioned across cell wall layers.


Keywords


wood-moisture relations, electrical properties of wood, timber physics, percolation theory, wood damage mechanisms

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References


Åkerholm M, Salmén L (2001) Interactions between wood polymers studied by dynamic FT-IR spectroscopy. Polymer 42(3):963-969.

Baker AJ (1980) Corrosion of metal in wood products. In: Durability of Building Materials and Components. ASTM STP 691. West Conshohocken, PA: American Society for Testing and Materials.

——— (1988) Corrosion of metals in preservative-treated wood. In: Wood Protection Techniques and the Use of Treated Wood in Construction. Madison, Wisconsin: Forest Products Society.

Boardman C, Glass SV, Carll CG (2012) Moisture meter calibrations for untreated and ACQ-treated southern yellow pine lumber and plywood. Journal of Testing and Evaluation 40(1):1.

Carll C, Highley TL (1999) Decay of wood and wood-based products above ground in buildings. Journal of Testing and Evaluation 27(2):150-158.

Cousins W (1976) Elastic modulus of lignin as related to moisture content. Wood Science and Technology 10(1):9-17.

——— (1978) Young's modulus of hemicellulose as related to moisture content. Wood Science and Technology 12(3):161-167.

Griffin D (1977) Water potential and wood-decay fungi. Annual Review of Phytopathology 15(1):319-329.

Hafren J, Fujino T, Itoh T, Westermark U, Terashima N (2000) Ultrastructural changes in the compound middle lamella of Pinus thunbergii during lignification and lignin removal. Holzforschung 54(3):234-240.

Hearle JWS (1953) The electrical resistance of textile materials: IV. Theory. Journal of the Textile Institute 44:T177-T198-T177-T198.

Jakes JE, Plaza N, Stone DS, Hunt CG, Glass SV, Zelinka SL (2013) Mechanism of transport through wood cell wall polymers. Journal of Forest Products and Industries 2(6):10-13.

James WL (1963) Electric Moisture Meters For Wood. U.S. Forest Service Research Note FPL-08. Madison, WI: US Forest Service Forest Products Laboratory.

Kelley SS, Rials TG, Glasser WG (1987) Relaxation behaviour of the amorphous components of wood. Journal of Materials Science 22(2):617-624.

Olsson A-m, Salmén L (2004) The softening behavior of hemicelluloses related to moisture. In: ACS symposium series: Washington, DC; American Chemical Society; 1999.

Stamm AJ (1929) The fiber-saturation point of wood as obtained from electrical conductivity measurements. Industrial and Engineering Chemistry, Analytical Edition 1(2):94-97.

Stevanic JS, Salmén L (2009) Orientation of the wood polymers in the cell wall of spruce wood fibres. Holzforschung 63(5):497-503.

Telford WM, Geldard LP, Sheriff RE (1990) Chapter 8. Resistivity Methods. In: Applied geophysics. Cambridge: Cambridge University Press.

Viitanen H, Paajanen L (1988) in The critical moisture and temperature conditions for the growth of some mould fungi and the brown rot fungus Coniophora puteana on wood. . Paper read at International Research Group on Wood Protection, at Madrid, Spain.

Wang J, Morris PI (2010). A review on conditions for decay initiation and progression. In International Research Group on Wood Protection. Biarritz France: IRG Secretariat.

Zelinka S, Glass S, Stone D (2008a) A Percolation Model for Electrical Conduction in Wood with Implications for Wood-Water Relations. Wood and Fiber Science 40(4):544-552.

Zelinka S, L., Gleber S-C, Vogt S, Rodríguez López Gabriela M, Jakes Joseph E (2015a) Threshold for ion movements in wood cell walls below fiber saturation observed by X-ray fluorescence microscopy (XFM). Holzforschung 69(4):441-448.

Zelinka SL, Glass SV, Boardman CR, Derome D (2014) Moisture storage and transport properties of preservative treated and untreated southern pine wood. Wood Material Science & Engineering:1-11.

Zelinka SL, Rammer DR, Stone DS (2008b) Impedance spectroscopy and circuit modeling of Southern pine above 20% moisture content. Holzforschung 62(6):737-744.

Zelinka SL, Stone DS, Rammer DR (2007) Equivalent circuit modeling of wood at 12% moisture content. Wood and Fiber Science 39(4):556-565.

Zelinka SL, Wiedenhoeft AC, Glass SV, Ruffinatto F (2015b) Anatomically informed mesoscale electrical impedance spectroscopy in southern pine and the electric field distribution for pin-type electric moisture metres. Wood Material Science & Engineering 10(2):189-196.


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