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Thermal-Resistant Polyurethane/Nanoclay Powder Coatings: Degradation Kinetics Study

Abstract

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.

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Category:
Articles
Type:
artykuły w czasopismach
Published in:
Coatings no. 10,
ISSN: 2079-6412
Language:
English
Publication year:
2020
Bibliographic description:
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:
Digital Object Identifier (open in new tab) 10.3390/coatings10090871
Verified by:
Gdańsk University of Technology

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