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Abstrakt
In the present study, thermal degradation kinetics of polyurethane (PU) powder coatings reinforced with organo-modified montmorillonite (OMMT) was investigated. PU nanocomposites were prepared in different concentrations of 1, 3, and 5 wt.% of OMMT via the extrusion method. The microstructure of the nanocomposites was observed by scanning electron microscope (SEM) illustrating uniform dispersion of OMMT nano-clay platelets in the PU matrix except for the sample containing 5 wt.% nano-palates. Thermal degradation kinetics of the PU nanocomposite was investigated using thermogravimetric analysis (TGA) at different heating rates of 5, 10, and 20 °C/min. The results showed that the initial decomposition temperatures were shifted toward higher values (more than 40 °C for T5% and up to 20 °C for T10%) by introducing the nano-clay to the PU matrix. Friedman, Kissinger–Akahira–Sunose (KAS), Flynn–Wall–Ozawa (FWO), and modified Coats-Redfern iso-conversional methods were applied to model the decomposition reaction and the activation energy of the nanocomposite powder coatings. Overall, the presence of nano-clay increased the activation energy of the PU degradation up to 45 kJ/mol, when compared to the blank PU, which suggests very high thermal stability of nanocomposites. The Sestak-Berggren approach proposed a good approximation for the reaction model, especially at low temperatures. Thus, PU decomposition was detected as an autocatalytic reaction, which was suppressed by the barrier effect of OMMT nano-palates intercalated with polymer chains.
Cytowania
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Autorzy (9)
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Maryam Jouyandeh
-
Behzad Hadavand
-
Farimah Tikhani
-
Reza Khalili
-
Babak Bagheri
-
Payam Zarrintaj
-
Henri Vahabi
-
Mohammad Saeb
Cytuj jako
Pełna treść
- Wersja publikacji
- Accepted albo Published Version
- Licencja
-
otwiera się w nowej karcie
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Informacje szczegółowe
- Kategoria:
- Publikacja w czasopiśmie
- Typ:
- artykuły w czasopismach
- Opublikowano w:
-
Coatings
nr 10,
ISSN: 2079-6412 - Język:
- angielski
- Rok wydania:
- 2020
- Opis bibliograficzny:
- Jouyandeh M., Hadavand B., Tikhani F., Khalili R., Bagheri B., Zarrintaj P., Formela K., Vahabi H., Saeb M.: Thermal-Resistant Polyurethane/Nanoclay Powder Coatings: Degradation Kinetics Study// Coatings -Vol. 10,iss. 9 (2020), s.871-
- DOI:
- Cyfrowy identyfikator dokumentu elektronicznego (otwiera się w nowej karcie) 10.3390/coatings10090871
- Weryfikacja:
- Politechnika Gdańska
wyświetlono 71 razy
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