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Enhanced Thermal Properties of Zirconia Nanoparticles and Chitosan-Based Intumescent Flame Retardant Coatings

School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongnam 51140, Korea
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Appl. Sci. 2019, 9(17), 3464; https://doi.org/10.3390/app9173464
Received: 10 July 2019 / Revised: 15 August 2019 / Accepted: 19 August 2019 / Published: 22 August 2019
(This article belongs to the Section Nanotechnology and Applied Nanosciences)
Zirconia (ZrO2)-based flame retardant coatings were synthesized through the process of grinding, mixing, and curing. The flame retardant coatings reinforced with zirconia nanoparticles (ZrO2 NPs) were prepared at four different formulation levels marked by F0 (without adding ZrO2 NPs), F1 (1% w/w ZrO2 NPs), F2 (2% w/w ZrO2 NPs), and F3 (3% w/w ZrO2 NPs) in combination with epoxy resin, ammonium polyphosphate, boric acid, chitosan, and melamine. The prepared formulated coatings were characterized by flammability tests, combustion tests, and thermogravimetric analysis. Finally, char residues were examined with scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). The peak heat release rate (PHRR) of the controlled sample filled with functionalized ZrO2 NPs was observed to decrease dramatically with increasing functionalized ZrO2 NPs loadings. There was an increase in the limit of oxygen index (LOI) value with the increase in the weight percentage of ZrO2 NPs. The UL-94V data clearly revealed a V-1 rating for the F0 sample; however, with the addition of ZrO2 NPs, the samples showed enhanced properties with a V-0 rating. Thermal gravimetric analysis (TGA) results revealed that addition of ZrO2 NPs Improved composite coating thermal stability at 800 °C by forming high residual char. The results obtained here reveal that the addition of ZrO2 NPs in the formulated coatings has shown the excellent impact as flame retardant coatings. View Full-Text
Keywords: ZrO2 NPs; intumescent flame retardant coatings; SEM; XRD; TGA ZrO2 NPs; intumescent flame retardant coatings; SEM; XRD; TGA
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MDPI and ACS Style

Rao, T.N.; Hussain, I.; Lee, J.E.; Kumar, A.; Koo, B.H. Enhanced Thermal Properties of Zirconia Nanoparticles and Chitosan-Based Intumescent Flame Retardant Coatings. Appl. Sci. 2019, 9, 3464. https://doi.org/10.3390/app9173464

AMA Style

Rao TN, Hussain I, Lee JE, Kumar A, Koo BH. Enhanced Thermal Properties of Zirconia Nanoparticles and Chitosan-Based Intumescent Flame Retardant Coatings. Applied Sciences. 2019; 9(17):3464. https://doi.org/10.3390/app9173464

Chicago/Turabian Style

Rao, Tentu N.; Hussain, Imad; Lee, Ji E.; Kumar, Akshay; Koo, Bon H. 2019. "Enhanced Thermal Properties of Zirconia Nanoparticles and Chitosan-Based Intumescent Flame Retardant Coatings" Appl. Sci. 9, no. 17: 3464. https://doi.org/10.3390/app9173464

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