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Silane‐functionalized Al 2 O 3 ‐modified polyurethane powder coatings: Nonisothermal degradation kinetics and mechanistic insights
Author(s) -
Hadavand Behzad Shirkavand,
Jouyandeh Maryam,
Paran Seyed Mohamad Reza,
Khalili Reza,
Vahabi Henri,
Bafghi Hamed Fakharizadeh,
Laoutid Fouad,
Vijayan P. Poornima,
Saeb Mohammad Reza
Publication year - 2020
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49412
Subject(s) - activation energy , polyurethane , thermogravimetric analysis , materials science , nanocomposite , kinetics , thermal decomposition , decomposition , order of reaction , degradation (telecommunications) , chemical engineering , nuclear chemistry , chemical process of decomposition , composite material , chemistry , reaction rate constant , organic chemistry , telecommunications , physics , quantum mechanics , computer science , engineering
This work reports on nonisothermal degradation kinetics of polyurethane (PU)‐based powder coatings containing 1, 3, and 5%wt% vinyltrimethoxysilane functionalized Al 2 O 3 (V‐Al 2 O 3 ) nanoparticles. Thermogravimetric analysis of PU/V‐Al 2 O 3 powder coatings with different V‐Al 2 O 3 contents has been performed at different heating rates. Variation of activation energy ( E a ) of PU/V‐Al 2 O 3 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‐Al 2 O 3 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‐Al 2 O 3 , respectively. Likewise, pre‐exponential factor values increased for samples containing V‐Al 2 O 3 nanoparticles compared to that of blank sample. Sestak–Berggren kinetic model appropriately captured thermal degradation behavior of PU/V‐Al 2 O 3 nanocomposites than that of n th order decomposition kinetic reaction models.