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

Coatings

SeyedMohammad Reza Paran¹  Amin Esmaeili²  Hossein Hosseini³  MohammadReza Saeb⁴  Ahmad Mohaddespour⁵  Krzyszof Formela⁶  Behzad Shirkavand Hadavand⁷  Hamed Fakharizadeh Bafghi⁷  Farimah Tikhani⁸  Henri Vahabi⁹  Maryam Jouyandeh⁹ 

[1] P.O. Box 467, Ardabil 6317836531, Iran;Advanced Materials Group, Iranian Color Society (ICS), Tehran 1591637144, Iran;Department of Chemical Engineering, Abadan Branch, Islamic Azad University;Department of Chemical Engineering, College of Engineering and Technology, American University of Middle East, P.O. Box 220, Dasman, Egaila 15453, Kuwait;Department of Chemical Engineering, School of Engineering Technology and Industrial Trades, College of the North Atlantic–Qatar, 24449 Arab League St, Doha 24449, Qatar;Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80–233 Gdańsk, Poland;Department of Resin and Additives, Institute for Color Science and Technology, Tehran 16765-654, Iran;School of Chemical Engineering, College of Engineering, University of Tehran, Tehran 11155-4563, Iran;Université de Lorraine, CentraleSupélec, LMOPS, F-57000 Metz, France;

关键词: polyurethane;    powder coating;    silane-functionalized ZrO₂ nanoparticles;    thermogravimetric analysis;    thermal degradation kinetics;   

DOI  :  10.3390/coatings10040413

来源: DOAJ

【 摘 要 】

A polyurethane (PU)-based powder coating reinforced with vinyltrimethoxysilane (VTMS)-functionalized ZrO₂ nanoparticles (V-ZrO₂) for thermal stability was developed. Chemical structure, microstructure and thermal degradation kinetics of the prepared coatings were investigated. The peak of aliphatic C–H vibrating bond in the Fourier transform infrared (FTIR) spectrum of V-ZrO₂ was a signature of VTMS attachment. Scanning electron microscopy (SEM) images reveled that, by increase of V-ZrO₂ content from 0.1 to 0.3 wt.% and then 0.5 wt.%, some agglomerations of nanoparticles are formed in the PU matrix. Thermogravimetric analysis (TGA) of the PU/V-ZrO₂ powder coatings was performed at different heating rates nonisothermally to capture alteration of activation energy (E_a) of degradation of PU/V-ZrO₂ powder coatings as a function of partial mass loss by using Friedman, Kissinger–Akahira-Sunose (KAS), Ozawa–Wall–Flynn (FWO) and modified Coats–Redfern isoconversional approaches. It was observed that by addition of 1 wt.% V-ZrO₂ to PU resin the early state degradation temperature at 5% weight loss increased about 65 °C, suggesting a physical barrier effect limiting the volatility of free radicals and decomposition products. Incorporation of 5 wt.% ZrO₂ led to about 16% and 10% increase in E_a and LnA of blank PU, respectively, which was indicative of higher thermal resistance of nanocomposite powder coatings against thermal degradation. There was also obvious agreement between model outputs and experimental data. The results reveal that nanocomposite coating shows superior thermal properties compared to neat PU powder coatings, and the presence of nano ZrO₂ in sufficient amount causes retardation of the thermal decomposition process.

【 授权许可】

Unknown