Article Dans Une Revue Polymer Testing Année : 2026

Influence of halloysite nanotubes onto the flame retardant performance and mechanical properties of LLDPE/EVA (70/30) polymer blends

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Reducing the amount of flame retardants present in electrical cable sheaths in order to maintain high cable flexibility while offering attractive fire-retardant properties is challenging. In this work, new fire-retardant halloysite nanotubes (HNTs)-based composite materials were prepared using linear low-density polyethylene (LLDPE)/ethylene-vinyl acetate (EVA) copolymer blend as the matrix and HNTs, potentially compatibilized by polyethylene-grafted maleic anhydride and eventually in presence of other flame retardant components such as ammonium phosphate (AP), quercetin (Q), pentaerythritol (PER) and ammonium polyphosphate (APP). Regarding the morphology of all the prepared blends, the fire properties were evaluated using a cone calorimeter while the mechanical properties were measured with a static tensile test. It was demonstrated that the most suitable mixtures in terms of heat release and ignition time were the one containing 20 wt% HNT and the one containing 10 wt% HNT, 7.5 wt% of ammonium phosphate, and 7.5 wt% of pentaerythritol, with TTI values of 43 s and 55 s, and pHRR values of 440 kW m−2 and 452 kW m−2, respectively. Regarding their tensile properties, both samples exhibit almost the same Young modulus and tensile strength whereas the sample with 10 wt% HNT, 7.5 wt% of AP, and 7.5 wt% of PER has a higher elongation at break which is interesting for cable and wire industry. Concerning the mechanical properties, the incorporation of HNTs in the LLDPE/EVA matrix decreased both the elongation at break and the tensile strength while increasing the Young's modulus, as expected. Elongation at break was also reduced significantly in presence of ammonium phosphate while it did not contribute to an increase in Young's modulus. In contrast, pentaerythritol and quercetin led to a significant increase in Young's modulus. These increases in modulus and decreases in elongation at break were attributed to a higher number and/or larger size of aggregates in the mixtures.

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Euphrasie Jasinski, Aurélie Taguet, Rodolphe Sonnier, Belkacem Otazaghine, Franck Gyppaz, et al.. Influence of halloysite nanotubes onto the flame retardant performance and mechanical properties of LLDPE/EVA (70/30) polymer blends. Polymer Testing, 2026, 159, pp.109207. ⟨10.1016/j.polymertesting.2026.109207⟩. ⟨hal-05625448⟩
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