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Article Dans Une Revue Macromolecular Materials and Engineering Année : 2024

Two‐Step Polyelectrolyte Complex Coating for Flame Retardant Flax

Résumé

Flax fabric textile is of great interest as bio-fiber reinforcement in composites, which has gained popularity due to the high demand for sustainable materials. Despite its sustainability, flax is inherently flammable. This study demonstrates a two-step polyelectrolyte complex (PEC) coating that renders flax fabric self-extinguishing. The PEC coating consists of polyethylenimine (PEI) and sodium hexametaphosphate (PSP), cured with a citric acid buffer. Sonication employed during the curing process improves the infiltration of the coating into the flax fibers and maintains the fabric's hand. When comparing non-sonicated and sonicated flax samples, the latter achieves self-extinguishing behavior and passes the vertical flame test. Pyrolysis-combustion flow calorimetry reveals that this PEI/PSP coating (with sonication) reduces the peak heat release rate and total heat release by 40% and 67%, respectively. The intumescent mechanism is predominantly observed in the condensed phase, as suggested by differential scanning calorimetry and X-ray photoelectron spectroscopy. The results demonstrate that the two-step PEC treatment with sonication effectively reduces the flammability of flax fabric, making it a promising option for the development of functional fibers, particularly for bio-composite reinforcement.

Domaines

Matériaux
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Dates et versions

hal-04189146 , version 1 (28-08-2023)

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Danixa Rodriguez‐melendez, Dallin L Smith, Sarah G Fisher, Rodolphe Sonnier, Henri Vahabi, et al.. Two‐Step Polyelectrolyte Complex Coating for Flame Retardant Flax. Macromolecular Materials and Engineering, 2024, 309 (1), pp.2300229. ⟨10.1002/mame.202300229⟩. ⟨hal-04189146⟩
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