| Investigation of the Thermal Degradation Kinetics of a polyvinyl alcohol-based nanocomposite using the Isoconversional Ozawa–Flynn–Wall Method |
| کد مقاله : 1314-ICOC |
| نویسندگان |
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زهرا ادبی1، فاطمه راوری *2 1دانشجو 2هیئت علمی |
| چکیده مقاله |
| In this study, the kinetic behavior of thermal degradation of a silk fibroin/polyvinyl alcohol/propolis/cerium oxide nanocomposite polymer (SF/PVA/B/CeO₂) was systematically investigated using the isothermal Ozawa–Flynn–Wall (OFW) method. Thermogravimetric analysis (TGA) data were collected at different heating rates (5, 10, 15, and 20 °C·min⁻¹) and subsequently analyzed. By applying this model-free is conversional approach, the activation energy (Ea) was determined over a wide conversion range from α = 0.1 to α = 0.9. The conversional analysis revealed that the activation energy exhibits only minor variations with increasing conversion degree, remaining within a relatively narrow range. This apparent constancy of Ea clearly indicates that the thermal degradation process of the nanocomposite is governed by a dominant and nearly single-step reaction mechanism, attributable to the rupture of internal bonds and interfacial interactions among the composite constituents. Emphasizing the elimination of thermodynamic assumptions and the use of an inherently model-free conversional method enabled a more reliable and less assumption-dependent kinetic evaluation of the degradation process. Overall, this study provides valuable insight into the thermal stability and degradation behavior of this bio-based nanocomposite polymer. |
| کلیدواژه ها |
| Nano polymer; Silk fibroin; Polyvinyl alcohol; Thermal degradation kinetics; Activation energy; Iso conversional analysis( Ozawa–Flynn–Wall) |
| وضعیت: پذیرفته شده |