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    Author(s): Charles Essien; Brian K. Via; Qingzheng Cheng; Thomas Gallagher; Timothy McDonald; Xiping Wang; Lori G. Eckhardt
    Date: 2017
    Source: Wood Science and Technology. 51(3): 475-492.
    Publication Series: Scientific Journal (JRNL)
    Station: Forest Products Laboratory
    PDF: Download Publication  (580.0 KB)

    Description

    The polymeric angle and concentration within the S2 layer of the softwood fiber cell wall are very critical for molecular and microscopic properties that influence strength, stiffness and acoustic velocity of wood at the macroscopic level. The main objective of this study was to elucidate the effect of cellulose, hemicellulose, lignin, microfibril angle and density on acoustic velocity and material mechanical properties of 14-year-old suppressed loblolly pine. Cellulose, hemicellulose and density are consistently the most important drivers of strength, stiffness and velocity. Cellulose and lignin are the highest and lowest contributor to velocity, respectively, with lignin acting as a sound wave dispersant, while cellulose is the most important conductor of sound wave at the molecular level, while hemicellulose acts as a special coupling agent between these components. The polymeric constituents are thus important drivers of sound wave propagation at the molecular level, while density played a subsequent role at the macroscale.

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    Citation

    Essien, Charles; Via, Brian K.; Cheng, Qingzheng; Gallagher, Thomas; McDonald, Timothy; Wang, Xiping; Eckhardt, Lori G. 2017. Multivariate modeling of acoustomechanical response of 14-year-old suppressed loblolly pine (Pinus taeda) to variation in wood chemistry, microfibril angle and density. Wood Science and Technology. 51(3): 475-492.

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    Keywords

    Suppressed loblolly pine, microfibril angle, polymeric constituents, acoustic velocity, mechanical properties

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https://www.fs.usda.gov/treesearch/pubs/54410