|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|1230022||1495198||2017||6 صفحه PDF||سفارش دهید||دانلود رایگان|
• The chemical changes in wood components are determined by vibrational spectroscopy.
• High temperatures caused to degrade hemicellulose as a result of organic acids.
• The chemical reactions in the lignin changed the intensity of lignin bands.
• The vibrational spectra's from wood powder are a rapid and reliable analysis method.
In this study, attenuated total reflectance-Fourier transform infrared (ATR-FTIR) and Fourier-transform Raman (FT-Raman) spectroscopy techniques were used to determine changes in the chemical structure of heat-treated woods. For this purpose, scots pine (Pinus sylvestris L.), oriental beech (Fagus orientalis L.), and oriental spruce (Picea orientalis L.) wood species were heat-treated at different temperatures. The effect of chemical changes on the FT-Raman and ATR-FTIR bands or ratios of heat-treated wood was related with the OH association of cellulose, functional groups, and the aromatic system of lignin. The effects of heat treatment on the carbohydrate and lignin peaks varied depending on the wood species. The spectral changes that occurred after heat treatment reflected the progress of the condensation reaction of lignin. Degradation of hemicelluloses led to a decrease in free hydroxyl groups. High temperature caused crystalline cellulose to increase due to the degradation of amorphous cellulose.
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Journal: Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy - Volume 171, 15 January 2017, Pages 395–400