Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack
Fuente:
Redalyc
Saved in:
| Main Author: | |
|---|---|
| Format: | Artículo científico |
| Language: | en |
| Published: |
Universidad del Bío Bío
2020
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1876432104042004480 |
|---|---|
| author | Ezequiel Gallio |
| author_facet | Ezequiel Gallio |
| contents | Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack Ezequiel Gallio Henrique Römer Schulz Laíse Guerreiro Nidria Dias Cruz Paula Zanatta Mário Antônio Pinto da Silva Júnior Darci Alberto Gatto Agrociencias Nasutitermes wood protection thermal stability wood deterioration Chemical composition This study aimed to evaluate the variations in thermal and chemical characteristics of juvenile Eucalyptus grandis wood submitted to a deterioration test by Nasutitermes termites. For this purpose, a biodeterioration test with termites was conducted according to ASTM D 3345 (2008), in which, after the end of the period corresponding to the test (40 days), we evaluated the mass loss, chemical composition and thermal stability of the main components of the deteriorated wood samples and those belonging to the control group. We found that deterioration due to exposure of the samples to Nasutitermes sp. termites caused a mass loss of 66,88% for wood with a density at 12% moisture content of 412 kg/m3. The quantitative chemical composition showed a reduction in the contents of cellulose, hemicellulose and lignin. Analysis of the variations of the organic functional groups related to the chemical composition of the wood by Fourier Transform Infrared Spectroscopy and relative intensity of the spectral bands also showed reductions, demonstrating homogeneous deterioration of the main components of the deteriorated woods. The thermal stability showed an increase in deteriorated wood for most of the temperature ranges, mainly for those that corresponded to losses in moisture and volatiles (25 °C - 100 °C), hemicelluloses (240 °C - 300 °C), celluloses, and together with initial lignin degradation (310 °C to 400 °C), possibly due to the removal of cellulose and hemicellulose, as well as the deposition of substances expelled by the termites in the cell wall. From the results, we conclude that the termites do not have specificity regarding the chemical component and that the deterioration caused variations in the chemical composition of the wood, whereas the opposite was observed for thermal stability, which presented an increase in most of the temperatures ranges for the deteriorated woods compared to the control group. 2020 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48564749002 https://www.redalyc.org/journal/485/48564749002/ https://www.redalyc.org/journal/485/48564749002/html/ https://www.redalyc.org/journal/485/48564749002/48564749002.epub https://www.redalyc.org/journal/485/48564749002/movil en http://www.redalyc.org/revista.oa?id=485 Maderas. Ciencia y Tecnología application/pdf Universidad del Bío Bío Maderas. Ciencia y Tecnología (Chile) Num.2 Vol.22 |
| format | Artículo científico |
| id | redalyc_48564749002 |
| institution | Redalyc |
| language | en |
| publishDate | 2020 |
| publisher | Universidad del Bío Bío |
| spellingShingle | Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack Ezequiel Gallio Agrociencias Nasutitermes wood protection thermal stability wood deterioration Chemical composition Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack Ezequiel Gallio Henrique Römer Schulz Laíse Guerreiro Nidria Dias Cruz Paula Zanatta Mário Antônio Pinto da Silva Júnior Darci Alberto Gatto Agrociencias Nasutitermes wood protection thermal stability wood deterioration Chemical composition This study aimed to evaluate the variations in thermal and chemical characteristics of juvenile Eucalyptus grandis wood submitted to a deterioration test by Nasutitermes termites. For this purpose, a biodeterioration test with termites was conducted according to ASTM D 3345 (2008), in which, after the end of the period corresponding to the test (40 days), we evaluated the mass loss, chemical composition and thermal stability of the main components of the deteriorated wood samples and those belonging to the control group. We found that deterioration due to exposure of the samples to Nasutitermes sp. termites caused a mass loss of 66,88% for wood with a density at 12% moisture content of 412 kg/m3. The quantitative chemical composition showed a reduction in the contents of cellulose, hemicellulose and lignin. Analysis of the variations of the organic functional groups related to the chemical composition of the wood by Fourier Transform Infrared Spectroscopy and relative intensity of the spectral bands also showed reductions, demonstrating homogeneous deterioration of the main components of the deteriorated woods. The thermal stability showed an increase in deteriorated wood for most of the temperature ranges, mainly for those that corresponded to losses in moisture and volatiles (25 °C - 100 °C), hemicelluloses (240 °C - 300 °C), celluloses, and together with initial lignin degradation (310 °C to 400 °C), possibly due to the removal of cellulose and hemicellulose, as well as the deposition of substances expelled by the termites in the cell wall. From the results, we conclude that the termites do not have specificity regarding the chemical component and that the deterioration caused variations in the chemical composition of the wood, whereas the opposite was observed for thermal stability, which presented an increase in most of the temperatures ranges for the deteriorated woods compared to the control group. 2020 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48564749002 https://www.redalyc.org/journal/485/48564749002/ https://www.redalyc.org/journal/485/48564749002/html/ https://www.redalyc.org/journal/485/48564749002/48564749002.epub https://www.redalyc.org/journal/485/48564749002/movil en http://www.redalyc.org/revista.oa?id=485 Maderas. Ciencia y Tecnología application/pdf Universidad del Bío Bío Maderas. Ciencia y Tecnología (Chile) Num.2 Vol.22 |
| title | Thermochemical behavior of Eucalyptus grandis wood exposed to termite attack |
| topic | Agrociencias Nasutitermes wood protection thermal stability wood deterioration Chemical composition |
| url | https://www.redalyc.org/articulo.oa?id=48564749002 https://www.redalyc.org/journal/485/48564749002/ https://www.redalyc.org/journal/485/48564749002/html/ https://www.redalyc.org/journal/485/48564749002/48564749002.epub https://www.redalyc.org/journal/485/48564749002/movil |