| Affiliation: | 1. Department of Resin and Additives, Institute for Color Science and Technology, Tehran, Iran;2. Université de Lorraine, CentraleSupélec, LMOPS, F-57000, Metz, France;3. Advanced Materials Group, Iranian Color Society (ICS), Tehran, Iran;4. Université de Lorraine, CentraleSupélec, LMOPS, F-57000, Metz, France Laboratoire Matériaux Optiques, Photoniques et Systèmes, CentraleSupélec, Université Paris-Saclay, Metz, France;5. Laboratory of Polymeric & Composite Materials, Materia Nova Research Center, Mons, Belgium;6. Department of Chemistry, Sree Narayana College for Women, Kollam, Kerala, India |
| Abstract: | This work reports on nonisothermal degradation kinetics of polyurethane (PU)-based powder coatings containing 1, 3, and 5%wt% vinyltrimethoxysilane functionalized Al2O3 (V-Al2O3) nanoparticles. Thermogravimetric analysis of PU/V-Al2O3 powder coatings with different V-Al2O3 contents has been performed at different heating rates. Variation of activation energy (Ea) of PU/V-Al2O3 powder coatings was modeled as a function of partial mass loss by using Kissinger–Akahira–Sunose, Ozawa–Wall–Flynn and modified Coats–Redfern isoconversional approaches. The results revealed hindered decomposition process of PU/V-Al2O3 nanocomposite powder coatings, featured by an increase in activation energy of degradation from ∼158 for blank PU to 225, 183, and 229 kJ/mol for nanocomposites filled with 1, 3, and 5 wt% of V-Al2O3, respectively. Likewise, pre-exponential factor values increased for samples containing V-Al2O3 nanoparticles compared to that of blank sample. Sestak–Berggren kinetic model appropriately captured thermal degradation behavior of PU/V-Al2O3 nanocomposites than that of nth order decomposition kinetic reaction models. |
