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Article

Effects of Graphite Oxide Nanoparticle Size on the Functional Properties of Layer-by-Layer Coated Flexible Foams

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Dipartimento di Scienza Applicata e Tecnologia, Politecnico di Torino, Alessandria Campus, Viale Teresa Michel 5, 15121 Alessandria, Italy
2
Avanzare Innovacion Tecnologica S.L., Avda. Lentiscares 4-6, Poligono Industrial Lentiscares, 26370 Navarrete, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Tamá Scabó
Nanomaterials 2021, 11(2), 266; https://doi.org/10.3390/nano11020266
Received: 15 December 2020 / Revised: 15 January 2021 / Accepted: 17 January 2021 / Published: 20 January 2021
The exploitation of self-assembled coatings comprising graphite oxide (GO) nanoplates has been recently demonstrated as a promising route to improve the fire safety of flexible polyurethane (PU) foams. However, limited knowledge has been gathered on the correlations between the physical and chemical properties of different GO grades and the performance obtained in this application. This work addresses the effects of the nanoparticle dimensions on the layer-by-layer (LbL) assembly and flame-retardant properties of GO-based coatings deposited on PU foams. To this aim, three GO bearing different lateral sizes and thicknesses were selected and LbL-assembled with chitosan (CHIT). Coating growth and morphology were evaluated by FTIR and FESEM, respectively. The resulting CHIT/GO assemblies were demonstrated to be capable of slowing down the combustion of the PU both in flammability and forced combustion tests. In addition, compressive stress/strain tests pointed out that the LbL-coated foams (22–24 kg/m3) could easily replace denser commercial PU foam (40–50 kg/m3) with weight reduction potentials in the transport field. These results are correlated with the properties of the employed GO. The production of assemblies characterized by a high density of CHIT/GO interfaces is identified as the main parameter controlling the FR efficiency and the mechanical properties of the coatings. View Full-Text
Keywords: chitosan; graphite oxide; layer by layer; flame retardancy chitosan; graphite oxide; layer by layer; flame retardancy
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MDPI and ACS Style

Maddalena, L.; Gomez, J.; Fina, A.; Carosio, F. Effects of Graphite Oxide Nanoparticle Size on the Functional Properties of Layer-by-Layer Coated Flexible Foams. Nanomaterials 2021, 11, 266. https://doi.org/10.3390/nano11020266

AMA Style

Maddalena L, Gomez J, Fina A, Carosio F. Effects of Graphite Oxide Nanoparticle Size on the Functional Properties of Layer-by-Layer Coated Flexible Foams. Nanomaterials. 2021; 11(2):266. https://doi.org/10.3390/nano11020266

Chicago/Turabian Style

Maddalena, Lorenza; Gomez, Julio; Fina, Alberto; Carosio, Federico. 2021. "Effects of Graphite Oxide Nanoparticle Size on the Functional Properties of Layer-by-Layer Coated Flexible Foams" Nanomaterials 11, no. 2: 266. https://doi.org/10.3390/nano11020266

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