PREPARATION AND CHARACTERIZATION OF OXIDIZED VISCOSE RAYON AS ACTIVATED CARBON FIBER PRECURSOR
DOI:
https://doi.org/10.5281/zenodo.7955648Keywords:
Viscose rayon, X-ray diffraction, Elemental analysis, Infrared spectroscopy, Oxidation, Thermal analysisAbstract
Viscose rayon fibers prepared with phosphoric acid (H3PO4) were oxidized for 30 minutes in air at 150 to 250 °C for 30 min. Optical microscopy, density, elemental analysis, (DSC) calorimetry by differential scanning, (TGA) analysis of thermogravimetric, X-ray diffraction and IR spectroscopy measurements were used to follow and monitor the structural evolution during the oxidation of the phosphorylated viscose rayon fiber.
The physical and chemical properties of phosphorylated and oxidized viscose-rayon fibers changed as the temperature increased. The dehydration of cellulose caused an increase in linear density loss and fiber thickness with temperature. Carbon concentration increased, but hydrogen, oxygen, and phosphorous level decreased, according to elemental analysis. The findings demonstrate that dephosphorylation occurs as temperature rises.
As the results of the DSC and TGA measurements represent how the thermal stability was progressing. The TGA data further demonstrated that a char yield of 49.6% is achievable at 1000°C. The outcomes of X-ray diffraction examination demonstrated the removal of crystallinity brought by de-crystallization processes
An increasing number of ladder-like structures with aromatic moieties were also discovered by X-ray diffraction investigation. The study of (IR) spectroscopy data revealed a progressive and constant decline in the intensity of CH and OH vibration, which are strongly related to the dehydration process. As the results of X-ray diffraction were confirmed by IR spectrograph, which demonstrated the finishing of crystalline structure in the 2000-800 cm-1 region. In the 1590–1600 cm-1 range, (IR) spectroscopy also showed double bonds of C=C, which was responsible for the emergence of structures like a crosslinked ladder. The outcomes demonstrated that phosphorylation followed by oxidation in air resulted in the enhancement of the oxidative stability in viscose-rayon fibers following activation and carbonization.
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