The Oriented Structure of Lignin and its Viscoelastic Properties Studied by Static and Dynamic FT-IR Spectroscopy
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M. Åkerholm
Summary
In order to define the role of lignin for stress transfer in the fiber wall, its orientation and mechanical interaction with other cell-wall components were investigated. Polarized infrared spectra of oriented thermomechanical pulp fiber sheets were used to determine the molecular orientation, and dynamic infrared spectroscopy was used to study the rheology of lignin in the cell wall. The results indicate that there is a preferred orientation of the phenyl-propane units of lignin along the fiber axis in spruce tracheids. This implies there is an ordered structure of lignin in the secondary wall of tracheids analogous to that of the cell-wall polysaccharides. The dynamic IR-spectra also indicated that lignin exhibits a much more viscoelastic behavior than do the carbohydrates, a knowledge of importance in the interpretation of transverse fiber properties.
Copyright © 2003 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Natural Decay Resistance of Juvenile Teak Wood Grown in High Input Plantations
- The Need for Unequivocally Defined Reference Fungi-Genomic Variation in Two Strains Named as Coniophora puteana BAM Ebw. 15
- The Oriented Structure of Lignin and its Viscoelastic Properties Studied by Static and Dynamic FT-IR Spectroscopy
- Formation of β-O-4 Lignin Models -A Theoretical Study
- Synthesis of Lignin-Related Cinnamaldehydes
- Synthesis of Coniferins 13C-Enriched at Position 4 or 5 of the Guaiacyl Ring
- Alkaline Chemi-Mechanical Pulp from Poplar. Relationship between Chemical State, Swelling and Papermaking Properties
- Effect of Ozonation on Assembly of Xylans
- Oxidized Derivatives of Lipophilic Extractives Formed during Hardwood Kraft Pulp Bleaching
- Optimization of a Laccase-Mediator Stage for TCF Bleaching of Flax Pulp
- Analysis of Pinus radiata D. Don Bark by Near Infrared Spectroscopy
- Analysis of Black Wattle (Acacia mearnsii De Wild) Bark by Near Infrared Spectroscopy
- Computer Aided Identification of the Moisture Transport Parameters in Spruce Wood
- Effect of High Temperature on the Change in Color, Dimensional Stability and Mechanical Properties of Spruce Wood
- The Adjusted Dynamic Modulus of Elasticity Above the Fiber Saturation Point in Taiwania Plantation Wood by Ultrasonic-Wave Measurement
- Effects of Clonal Selection by Microfibril Angle on the Genetic Improvement of Stiffness in Cryptomeria japonica D. Don
- Observation of Development of Microcracks on Wood Surface Caused by Drying Stresses
- Personalia/Literature Reports
