Abstract
Kinetic modeling and degradation study of liquid polysulfide (LPS)/clay nanocomposite is possible through Ozawa–Flynn–Wall (OFW) and Kissinger methods. Comparing the results of these models with experimental data leads to provide an accurate degradation kinetic evaluation of these materials. To this aim, the morphology and distribution of clay nanoparticles (CNPs) within the LPS matrix were investigated using Field Emission Scanning Electron Microscopy (FESEM) and X-ray diffraction (XRD). To evaluate the interaction between the LPS and the CNPs, the Fourier transform infrared (FTIR) identification was utilized. Furthermore, to investigate the kinetics of degradation, the thermal gravimetric analysis (TGA) and derivative thermogravimetry (DTG) of the samples were used in the nitrogen atmosphere with the help of Kissinger and Ozawa–Flynn–Wall (OFW) models. The characterization results confirmed the homogenous dispersion of the CNPs into the LPS matrix. In addition, the presence of CNPs increased the thermal stability and activation energy (Ea) of the samples at different conversion rates. Moreover, the OFW method was highly consistent with the experimental data and provided an appropriate fit for the degradation kinetics.
Highlights
In 1840, polysulfide was discovered by the reaction of ethylene dichloride and potassium sulfide [1]
Based on the early literature studying the thermal behavior of polysulfide/clay nanoparticles (CNPs) nanocomposites, there is a lack in the study of the degradation kinetics with the view of comparing and matching different modeling methods with experimental results
liquid polysulfide (LPS)/CNPs nanocomposites were prepared, and the presence of CNPs and their interactions with the LPS matrix were assessed via Fourier transform infrared (FTIR), X-ray diffraction (XRD), Field Emission Scanning Electron Microscopy (FESEM), and Energy Dispersive X-ray (EDX) analyses
Summary
In 1840, polysulfide was discovered by the reaction of ethylene dichloride and potassium sulfide [1]. Based on the early literature studying the thermal behavior of polysulfide/CNPs nanocomposites, there is a lack in the study of the degradation kinetics with the view of comparing and matching different modeling methods with experimental results. Methods including Ozawa–Flynn–Wall (OFW), Friedman, Kissinger, and Coats-Redfern are widely utilized in determining the parameters of thermal degradation [18] Some of these methods, such as OFW and Kissinger, can be applied to study the kinetics degradation of polymer nanocomposites using the results of TGA and DSC analyses [20,21]. In the current study, in addition to the fabrication and characterization of LPS/CNP nanocomposites, the modeling of the thermal degradation behavior was performed by Kissinger and OFW methods. Proportional fitting of degradation kinetics due to the presence of the CNPs in different amounts up to 5 wt.% are provided
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