Relaxation behaviour of the amorphous components of wood

• Published in: Journal of materials science Vol. 22; no. 2; pp. 617 - 624
• Main Authors: KELLEY, S. S, RIALS, T. G, GLASSER, W. G
• Format: Journal Article
• Language: English
• Published: Heidelberg Springer 01-02-1987
• Subjects: Applied sciences; Exact sciences and technology; Polymer industry, paints, wood; Properties and testing; Wood; Wood. Paper. Non wovens; Glass transition; Viscoelasticity; Differential scanning calorimetry; Lignin; Hemicellulose; Wood; Humidity; Thermomechanical analysis; Rheological properties
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/BF01160778

The viscoelastic properties of wood were investigated using dynamic mechanical thermal analysis and differential scanning calorimetry. Under a limited set of conditions, two separate glass transitions (T sub(g)) could be identified with both techniques. These two transitions were identified as arising from the amorphous lignin and hemicellulose matrix in the wood cell wall. Moisture dramatically affected the temperature at which the two dispersions occurred and, consequently, the ability to resolve their independent responses. The relationship between T sub(g) and moisture for both components could be modelled with the Kwei equation, which accounts for the presence of secondary interactions.