ABSTRACT Polyamide 6 (PA6) composites offer great promise for industrial applications, yet balancing flame retardancy with mechanical properties is an ongoing challenge. Epoxy silicone oil (ESO) acted as a reactive compatibilizer to prepare flame‐retardant PA6/ADP/ESO composites. The fire safety of composites was evaluated using standard flame‐retardant tests and combustion behavior tests. Meanwhile, the effects of ESO incorporation on the rheological behavior, mechanical properties, and thermal stability of PA6/ADP composites were systematically studied by rheological tests, impact tests, and thermogravimetric analysis (TGA). The results showed that even with a total addition of only 11% of the ADP/ESO (96:4) system, the PA6 composites still passed the UL‐94 V‐0 rating with a limiting oxygen index (LOI) of 30.7%. Compared to the pure PA6/ADP system, the PA6/ADP/ESO composites had a 43.11% lower peak of smoke production rate (PSPR) and excellent fire resistance. Furthermore, the impact strength of the PA6/ADP 96 ESO 4 composites was significantly improved, which was attributed to the chemical reaction between the epoxy functionalities in ESO and the terminal groups of PA6 chains, thereby promoting chain extension and the establishment of cross‐linked networks. Meanwhile, the melt viscosity of the system also increased. Interestingly, the increased shear force exerted by the matrix on the ADP aggregates not only significantly improved the dispersibility of ADP within the matrix but also helped to alleviate stress concentration. A simple, effective method produces high‐performance PA6 composites that balance flame retardancy with mechanical integrity.
Zhang et al. (Wed,) studied this question.
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