Thermal Decomposition of Cellulose Crystallites in Wood
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Dae-Young Kim
Summary
Decomposition of cellulose crystallites in wood during pyrolysis was studied by X-ray diffraction using a tension wood of Populus maximowiczii (cottonwood), which contains highly crystalline cellulose. X-ray diffraction profiles were recorded at varied temperature up to 360°C. By one-hour isothermal treatments, the cellulose crystallites did not decompose at 300°C, but completely decomposed at 340°C. The change in equatorial diffraction profile was studied by temperature scan up to 360°C and by isothermal treatment at the critical temperature of 320°C. Along with the changes by thermal expansion, the changes in diffraction diagram revealed a characteristic discrepancy between the diminishment of crystalline order and the reduction in crystallite size; i.e., the intensity of crystalline reflections diminished steadily while the crystallite size decreased much more slowly. A model of highly heterogeneous decomposition is proposed to explain this behavior.
Copyright © 2001 by Walter de Gruyter GmbH & Co. KG
Articles in the same Issue
- The Influence of Rays on the Transverse Elastic Anisotropy in Green Wood of Deciduous Trees
- The Effect of Varying Latewood Proportion on the Radial Distribution of Lignin Content in a Pine Stem
- Effects of Environmental Factors on the Color of Sugi (Cryptomeria japonica D. Don) Yellowish Heartwood
- Influence of Tannin-Copper Complexes as Preservatives for Wood on Mechanism of Decomposition by Brown-Rot Fungus Fomitopsis palustris
- Characteristics of Sludges Produced by Destabilization of CCA Preservative Solutions
- Extractives and Structural Components in Wood and Bark of Endemic Oak Quercus vulcanica Boiss
- Fragmentation of Suberin and Composition of Aliphatic Monomers Released by Methanolysis of Cork from Quercus suber L.,Analysed by GC-MS, SEC and MALDI-MS
- Controlled Assembly of Glucuronoxylans onto Cellulose Fibres
- Solid State NMR Studies on Inhomogeneous Structure of Fibre Wall in Kraft Pulp
- Characterizing the Surface Roughness of Thermomechanical Pulp Fibers with Atomic Force Microscopy
- Thermal Decomposition of Cellulose Crystallites in Wood
- Damage and Fracture Mechanisms during Mode I and III Loading of Wood
- Directional Characteristics of Near Infrared Light Reflected from Wood
- An Investigation of Selected Factors that Influence Hardwood Wettability
- Intra-Ring Variations in the Rolling Shear Modulus of Spruce Wood
- Study on Alkali-Accessible Chromophores from Unbleached Kraft Pulp
- Addition of Boron Based Compound in the LVL Glueline: Effect on the Mechanical Properties and the Leaching of Boron
Articles in the same Issue
- The Influence of Rays on the Transverse Elastic Anisotropy in Green Wood of Deciduous Trees
- The Effect of Varying Latewood Proportion on the Radial Distribution of Lignin Content in a Pine Stem
- Effects of Environmental Factors on the Color of Sugi (Cryptomeria japonica D. Don) Yellowish Heartwood
- Influence of Tannin-Copper Complexes as Preservatives for Wood on Mechanism of Decomposition by Brown-Rot Fungus Fomitopsis palustris
- Characteristics of Sludges Produced by Destabilization of CCA Preservative Solutions
- Extractives and Structural Components in Wood and Bark of Endemic Oak Quercus vulcanica Boiss
- Fragmentation of Suberin and Composition of Aliphatic Monomers Released by Methanolysis of Cork from Quercus suber L.,Analysed by GC-MS, SEC and MALDI-MS
- Controlled Assembly of Glucuronoxylans onto Cellulose Fibres
- Solid State NMR Studies on Inhomogeneous Structure of Fibre Wall in Kraft Pulp
- Characterizing the Surface Roughness of Thermomechanical Pulp Fibers with Atomic Force Microscopy
- Thermal Decomposition of Cellulose Crystallites in Wood
- Damage and Fracture Mechanisms during Mode I and III Loading of Wood
- Directional Characteristics of Near Infrared Light Reflected from Wood
- An Investigation of Selected Factors that Influence Hardwood Wettability
- Intra-Ring Variations in the Rolling Shear Modulus of Spruce Wood
- Study on Alkali-Accessible Chromophores from Unbleached Kraft Pulp
- Addition of Boron Based Compound in the LVL Glueline: Effect on the Mechanical Properties and the Leaching of Boron
