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Open AccessArticle

PET Foams Surface Treated with Graphene Nanoplatelets: Evaluation of Thermal Resistance and Flame Retardancy

1
Department of Applied Science and Technology, Politecnico di Torino, Alessandria Campus, Viale Teresa Michel 5, 15121 Alessandria, Italy
2
Directa Plus S.p.A., c/o ComoNExT—Science and Technology Park, Via Cavour 2, 22074 Lomazzo, Italy
3
INSTM Research Unit, Politecnico di Torino, Viale Teresa Michel 5, 15121 Alessandria, Italy
*
Author to whom correspondence should be addressed.
Academic Editor: Ana María Díez-Pascual
Polymers 2021, 13(4), 501; https://doi.org/10.3390/polym13040501
Received: 28 December 2020 / Revised: 2 February 2021 / Accepted: 3 February 2021 / Published: 6 February 2021
(This article belongs to the Special Issue Graphene-Based Polymer Nanocomposites: Recent Advances)
In this work, fire-retardant systems consisting of graphene nanoplatelets (GNPs) and dispersant agents were designed and applied on polyethylene terephthalate (PET) foam. Manual deposition from three different liquid solutions was performed in order to create a protective coating on the specimen’s surface. A very low amount of coating, between 1.5 and 3.5 wt%, was chosen for the preparation of coated samples. Flammability, flame penetration, and combustion tests demonstrated the improvement provided to the foam via coating. In particular, specimens with PSS/GNPs coating, compared to neat foam, were able to interrupt the flame during horizontal and vertical flammability tests and led to longer endurance times during the flame penetration test. Furthermore, during cone calorimetry tests, the time to ignition (TTI) increased and the peak of heat release rate (pHRR) was drastically reduced by up to 60% compared to that of the uncoated PET foam. Finally, ageing for 48 and 115 h at 160 °C was performed on coated specimens to evaluate the effect on flammability and combustion behavior. Scanning electron microscopy (SEM) images proved the morphological effect of the heat treatment on the surface, showing that the coating was uniformly distributed. In this case, fire-retardant properties were enhanced, even if fewer GNPs were used. View Full-Text
Keywords: PSS dispersant; cone calorimetry; flame penetration; flame-retardant surface coating; surface ageing PSS dispersant; cone calorimetry; flame penetration; flame-retardant surface coating; surface ageing
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MDPI and ACS Style

Matta, S.; Rizzi, L.G.; Frache, A. PET Foams Surface Treated with Graphene Nanoplatelets: Evaluation of Thermal Resistance and Flame Retardancy. Polymers 2021, 13, 501. https://doi.org/10.3390/polym13040501

AMA Style

Matta S, Rizzi LG, Frache A. PET Foams Surface Treated with Graphene Nanoplatelets: Evaluation of Thermal Resistance and Flame Retardancy. Polymers. 2021; 13(4):501. https://doi.org/10.3390/polym13040501

Chicago/Turabian Style

Matta, Samuele; Rizzi, Laura G.; Frache, Alberto. 2021. "PET Foams Surface Treated with Graphene Nanoplatelets: Evaluation of Thermal Resistance and Flame Retardancy" Polymers 13, no. 4: 501. https://doi.org/10.3390/polym13040501

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