CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT WOOD MONITORED BY FTIR
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Universidad del Bío Bío
2013
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| _version_ | 1876439741337960448 |
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| author | B Esteves |
| author_facet | B Esteves |
| contents | CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT WOOD MONITORED BY FTIR B Esteves H Pereira I Domingos A Velez Agrociencias FTIR Heat treatment Pinus pinaster Eucalyptus globulus A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectroscopic analysis.The heat treatment caused significant changes in the chemical composition and structure of wood, in lignin and polysaccharides. Hemicelluloses were the first to degrade as proved by the initial decrease of the 1730 cm-1 peak due to the breaking of acetyl groups in xylan. Hardwood lignin changed more than softwood lignin, with a shift of maximum absorption from 1505 cm-1 to approximately 1512 cm-1 due to decrease of methoxyl groups, loss of syringyl units or breaking of aliphatic side-chains. The macromolecular structure becomes more condensed and there is a clear increase of non-conjugated (1740 cm-1) in relation to conjugated groups (1650 cm-1). However, the changes induced by the thermaltreatment are difficult to monitor by FTIR spectroscopy due to the different chemical reactions occurring simultaneously. 2013 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48527705010 10.4067/S0718-221X2013005000020 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.15 |
| format | Artículo científico |
| id | redalyc_48527705010 |
| institution | Redalyc |
| language | en |
| publishDate | 2013 |
| publisher | Universidad del Bío Bío |
| spellingShingle | CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT WOOD MONITORED BY FTIR B Esteves Agrociencias FTIR Heat treatment Pinus pinaster Eucalyptus globulus CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT WOOD MONITORED BY FTIR B Esteves H Pereira I Domingos A Velez Agrociencias FTIR Heat treatment Pinus pinaster Eucalyptus globulus A hardwood, Eucalyptus globulus Labill., and a softwood Pinus pinaster Aiton., were heat treated at temperatures between 170 and 210ºC in an oven and in an autoclave. The samples were pre-extracted with dichloromethane, ethanol and water and ground prior to Fourier Transform Infrared (FTIR) spectroscopic analysis.The heat treatment caused significant changes in the chemical composition and structure of wood, in lignin and polysaccharides. Hemicelluloses were the first to degrade as proved by the initial decrease of the 1730 cm-1 peak due to the breaking of acetyl groups in xylan. Hardwood lignin changed more than softwood lignin, with a shift of maximum absorption from 1505 cm-1 to approximately 1512 cm-1 due to decrease of methoxyl groups, loss of syringyl units or breaking of aliphatic side-chains. The macromolecular structure becomes more condensed and there is a clear increase of non-conjugated (1740 cm-1) in relation to conjugated groups (1650 cm-1). However, the changes induced by the thermaltreatment are difficult to monitor by FTIR spectroscopy due to the different chemical reactions occurring simultaneously. 2013 artículo científico 0717-3644 https://www.redalyc.org/articulo.oa?id=48527705010 10.4067/S0718-221X2013005000020 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.15 |
| title | CHEMICAL CHANGES OF HEAT TREATED PINE AND EUCALYPT WOOD MONITORED BY FTIR |
| topic | Agrociencias FTIR Heat treatment Pinus pinaster Eucalyptus globulus |
| url | https://www.redalyc.org/articulo.oa?id=48527705010 |