Abstract
In order to investigate the thermal decomposition behavior of water-soluble azo dyes, a series of structurally isomeric water-soluble hydroxyl azo dyes were synthesized and their thermal decomposition phenomena were examined using TGA and DSC. Their thermal decomposition mechanism was also studied by measuring UV–Vis absorbance of the prepared dyes at various heating temperatures. From thermal analysis and spectroscopy, we found that the dyes decomposed gradually without a melting process, and those with strong inter-molecular interactions had high decomposition temperatures. Moreover, we suggested a new thermal decomposition mechanism different from that of the water-insoluble dye, in which dye molecules rapidly decomposed within a narrow temperature range following a melting process. We also found that dyes with stronger inter-molecular interactions had higher degradation temperatures using density analysis, X-ray diffraction (XRD), dynamic light scattering (DLS), and density functional theory (DFT) calculation.
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Kim, Y.D., Lee, J.J. An Investigation on Thermal Decomposition Behavior of Water-Soluble Azo Dyes. Fibers Polym 24, 2799–2806 (2023). https://doi.org/10.1007/s12221-023-00275-9
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DOI: https://doi.org/10.1007/s12221-023-00275-9