Thermal behavior of cashew gum by simultaneous TG/DTG/DSC-FT-IR and EDXRF
| Autor: | Jaqueline Souza de Freitas, Cheila G. Mothé |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Exothermic reaction
chemistry.chemical_classification Precipitation (chemistry) Analytical chemistry chemistry.chemical_element Condensed Matter Physics Polysaccharide Nitrogen Endothermic process Decomposition chemistry Physical and Theoretical Chemistry Fourier transform infrared spectroscopy Thermal analysis |
| Zdroj: | Journal of Thermal Analysis and Calorimetry. 116:1509-1514 |
| ISSN: | 1588-2926 1388-6150 |
| Popis: | Cashew gum, an exudate polysaccharide from Anacardium occidentale L., was purified by alcohol precipitation. Thermal behavior of this polysaccharide was investigated by simultaneous TG/DTG/DSC-FT-IR analysis performed under nitrogen and air atmospheres and heating rate of 10 K min−1. TG/DTG curves under oxidative atmosphere were similar to the curves under N2 atmosphere until 340 °C, however, it was observed a profile difference due to the presence of two DTG peaks at 430 and 460 °C. DSC results showed endothermic and exothermic events corroborating with TG/DTG curves. The Simultaneous TG/DSC-FTIR analysis revealed that evolved gases from the decomposition of cashew gum sample were CO2, CO, and groups: O–H, C–H, C=O, C–C, and C–O, in nitrogen and air atmospheres. Energy dispersive X-ray fluorescence analysis from the ash showed that the elements in larger amounts are CaO, MgO, and K2O. |
| Databáze: | OpenAIRE |
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