Solid State Decomposition Kinetics of Green Light Emitting Polyphenol Nanoparticles

The reaction process and kinetic parameters related to the solid state decomposition of green light emitting polyphenol nanoparticles (GLPN) synthesized by oxidative polymerization were investigated by thermogravimetric analysis technique (TG) at different heating rates. TG/DTG-DTA curves showed that the thermal decomposition occurred mainly in one stages. The kinetic parameters related to solid state decomposition stage of GLPN were calculated by using the methods based on multiple heating rates such as Kissinger, Kim-Park (KM), Tang, Flynn-Wall-Ozawa (FWO), Friedman (FR) and Kissinger-Akahira-Sunose (KAS). The activation energies obtained by Kissinger, Kim-Park, Tang, KAS, FWO, and FR methods were found to be 157.5, 158.0, 166.9, 165.8, 167.1 kJ/mol, respectively, in a wide range of conversion. Furthermore the reaction process related to the solid state decomposition stage of GLPN was also determined by using integral procedure Coats-Redfern (CR) and master plots. The analysis of the so-called methods showed that the solid state decomposition mechanism of polyphenol derivatives nanoparticles in N₂ went to the D_n mechanism (dimensional diffusion, n = 6).