New Transparent Flame-Retardant (FR) Coatings Based on Epoxy-Aluminum Hypophosphite Nanocomposites

aluminum hypophosphite; epoxy nanocomposites; fire testing; flame-retardant coatings; thermal degradation; Surfaces and Interfaces; Surfaces, Coatings and Films; Materials Chemistry

Abstract :

[en] The present study investigated the flame-retardant (FR) effect of transparent epoxy coating containing aluminum hypophosphite (AHP) nanoparticles (NPs) on polylactic acid (PLA) sheets used as a typical model of combustible polymeric material. First, AHP NPs (≤60 nm) were prepared by a specific two-stage wet milling process and deeply analyzed (morphology, thermal/mechanisms of degradation under nitrogen and air). The thermal properties of epoxy–AHP nanocomposites were compared with the pristine epoxy resin. The addition of AHP NPs into epoxy resin accelerated thermal degradation of the coating, thereby increasing the amount of char residue. The application of blank epoxy coating on the surface of PLA plate slightly made PLA more ignitable, without any reduction in the peak of heat release rate (pHRR). The decrease of time to ignition (TTI) was more important in the presence of AHP NPs due to their reactivity toward epoxy resin. Epoxy coating containing 15 wt.% AHP NPs showed the most significant reduction in pHRR as the result of the formation of a homogenous char layer. Further increase of AHP NPs content up to 20 wt.% did not end in any further enhancement, as a consequence of structural cracks observed in the coating that prevent the formation of an effective char. The coated samples remained transparent, promisingly paving the way to appropriate decorative flame-retardant coatings.

Disciplines :

Materials science & engineering

Author, co-author :

Laoutid, Fouad ; Université de Mons - UMONS > Unités externe > Materia Nova ASBL

Jouyandeh, Maryam ; Université de Lorraine, CentraleSupélec, LMOPS, Metz, France

Murariu, Oltea ; Université de Mons - UMONS > Unités externe > Materia Nova ASBL

Vahabi, Henri ; Université de Lorraine, CentraleSupélec, LMOPS, Metz, France

Saeb, Mohammad Reza ; Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gdańsk, Poland

Brison, Loic ; Université de Mons - UMONS > Unités externe > Materia Nova ASBL

Murariu, Marius ; Laboratory of Polymeric and Composite Materials, Materia Nova Materials RD Center & UMONS Innovation Center, Mons, Belgium

Dubois, Philippe ; Université de Mons - UMONS > Faculté des Science > Service des Matériaux Polymères et Composites

Language :

English

Title :

New Transparent Flame-Retardant (FR) Coatings Based on Epoxy-Aluminum Hypophosphite Nanocomposites

Publication date :

2023

Journal title :

Coatings

eISSN :

2079-6412

Publisher :

MDPI

Volume :

Issue :

Pages :

140

Peer reviewed :

Peer Reviewed verified by ORBi

Additional URL :

https://www.mdpi.com/2079-6412/13/1/140/pdf

Research unit :

S816 - Matériaux Polymères et Composites

Research institute :

R400 - Institut de Recherche en Science et Ingénierie des Matériaux

Available on ORBi UMONS :

since 13 January 2024

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