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Effects of heat treatment on the chemical compositions and thermal decomposition kinetics of Japanese cedar and beech wood
- Source :
- Polymer Degradation and Stability. 158:220-227
- Publication Year :
- 2018
- Publisher :
- Elsevier BV, 2018.
-
Abstract
- This study investigated variations in the chemical compositions and thermal decomposition kinetics of Japanese cedar and beech wood during heat treatment. Fourier transform infrared (FTIR) and nuclear magnetic resonance (NMR) spectra revealed that various reactions, such as hemicellulose deacetylation, condensation reactions causing lignin cross-linking, and reductions in cellulose amorphous regions, were carried out during the heat treatment process. In addition, combinations of FTIR spectra and principal component analysis (PCA) succeeded in discriminating the major changes in functional groups of wood at various heat treatment temperatures. On the other hand, the decrease in the storage modulus of wood was more rapid in the presence of oxygen than in an oxygen-free atmosphere during heat treatment. Accordingly, the activation energies of thermal decomposition using Arrhenius model for Japanese cedar and beech were 120.6 and 141.3 kJ/mol under air, respectively, while these values were 124.8 and 150.0 kJ/mol under nitrogen, respectively.
- Subjects :
- 040101 forestry
0106 biological sciences
Arrhenius equation
Polymers and Plastics
Condensation
Thermal decomposition
technology, industry, and agriculture
chemistry.chemical_element
04 agricultural and veterinary sciences
Condensed Matter Physics
01 natural sciences
Nitrogen
chemistry.chemical_compound
symbols.namesake
chemistry
Chemical engineering
Mechanics of Materials
010608 biotechnology
Materials Chemistry
symbols
0401 agriculture, forestry, and fisheries
Lignin
Hemicellulose
Fourier transform infrared spectroscopy
Cellulose
Subjects
Details
- ISSN :
- 01413910
- Volume :
- 158
- Database :
- OpenAIRE
- Journal :
- Polymer Degradation and Stability
- Accession number :
- edsair.doi...........1ed4a70db3c855d960315764d8c37134