Molecular design of reactive flame retardant for preparing biobased flame retardant polyamide 56

As resource and environmental issues become increasingly prominent worldwide, bio-based polyamides demonstrate appealing prospects due to their renewable and low carbon emission characteristics. The preparation of intrinsically flame-retardant polyamides by copolymerization of reactive flame retardants with biomass monomers becomes a hot research topic at present. In this work, reactive flame retardant (r-FR) is synthesized, showing excellent solubility and temperature resistance. Subsequently, flame retardant polyamide 56 (FRPA56) are prepared by one-step melt polycondensation. Specifically, when the r-FR content is 6wt%, FRPA56 has a high limiting oxygen index of 28.4%, and the vertical combustion reaches V-0 level, demonstrating excellent flame-retardant performance. Moreover, FAPA56 also owns outstanding temperature resistance and mechanical properties even with a r-FR content of 8wt%, in which the melting temperature and tensile strength are 246.1 degrees C and 71.05 MPa, respectively. This work develops an effective strategy for constructing intrinsically flame-retardant polyamide material, which can meet the requirements of engineering plastics and exhibit satisfactory performance in the field of textile.

Automated summary

With the increasingly prominent global resource and environmental issues, bio-based polyamides are showing promising prospects due to their renewable and low carbon emission characteristics. The copolymerization of reactive flame retardants with biomass monomers to prepare intrinsically flame-retardant polyamides has become a hot research topic. In this study, a reactive flame retardant with excellent solubility and temperature resistance is synthesized, and flame retardant polyamide 56 with excellent flame-retardant performance, temperature resistance, and mechanical properties is prepared through one-step melt polycondensation.