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Viscoelastic properties ofin situ lignin under water-saturated conditions

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Abstract

The viscoelastic properties of wood under water-saturated conditions have been studied in the temperature range 20 to 140° C at frequencies ranging between 0.05 and 20 Hz. It is demonstrated that the major transition in this temperature range is related to aglass transition, i.e. the glass transition of thein situ lignin. The difference in softening behaviour along and across the fibre direction is shown to be related to the stiffening effect of the cellulose microfibrils preferentially aligned along the fibre direction. The softening behaviour is also estimated for frequencies applicable to wood defibration processes, ∼104Hz. The implications of the wood properties under these conditions are discussed.

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Authors and Affiliations

  1. Swedish Forest Products Research Laboratory, Box 5604, S-11486, Stockholm, Sweden

    Lennart Salmén

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  1. Lennart Salmén
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Salmén, L. Viscoelastic properties ofin situ lignin under water-saturated conditions. J Mater Sci 19, 3090–3096 (1984). https://doi.org/10.1007/BF01026988

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  • DOI: https://doi.org/10.1007/BF01026988

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