Thermal-Resistant Polyurethane/Nanoclay Powder Coatings: Degradation Kinetics Study - Publication - Bridge of Knowledge

Your account

login

Search

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.

Citations

  • 1 6

    CrossRef

  • 0

    Web of Science

  • 1 4

    Scopus

Authors (9)

Cite as

Full text

download paper
downloaded 131 times
Publication version
Accepted or Published Version
License
Creative Commons: CC-BY open in new tab

Keywords

Details

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

seen 117 times

Recommended for you

Polyurethane/Silane-Functionalized ZrO2 Nanocomposite Powder Coatings: Thermal Degradation Kinetics

  • F. Tikhani,
  • B. Hadavand,
  • H. F. Bafghi
  • + 8 authors
2020

Isothermal Vulcanization and Non-Isothermal Degradation Kinetics of XNBR/Epoxy/XNBR-g-Halloysite Nanotubes (HNT) Nanocomposites

  • S. Paran,
  • G. Naderi,
  • E. Movahedifar
  • + 5 authors
2021

Recycled Polyurethane as a Second Phase in Thermoset Blends and Its Effect on Thermal Degradation Kinetics Studies

2018

Epoxy/Ionic Liquid-Modified Mica Nanocomposites: Network Formation–Network Degradation Correlation

  • M. Jouyandeh,
  • V. Akbari,
  • S. M. R. Paran
  • + 4 authors
2021
Meta Tags