Fabrication of flame retardant nylon 6 film composites with superior gas barrier property and puncture resistance

Developing a flame retardant and puncture resistant nylon 6 (PA6) film composite with excellent gas barrier property as a food packaging material is still a great challenge. Herein, microencapsulation and hydrogen-bonding interaction were adopted to synthesize a multifunctional additive (SiO2@CS@GO-S), which simultaneously improved the mechanical, gas barrier and flame retardant performances of PA6 film. The obtained results indicated that the gas barrier property of the as-prepared PA6 film composite containing 0.1 wt% SiO2@CS@GO-S (PA6/SiO2@[email protected]) was obviously improved. For instance, the oxygen transmission rate of the film composite decreased dramatically by 52.0% compared with that of PA6 film. Furthermore, the puncture resistance of the PA6/SiO2@[email protected] markedly increased from 18.3 N of PA6 to 25.3 N. Additionally, both thermal stability and fire safety of the PA6/SiO2@CS@GO-S film composites were enhanced. The peak of heat release rate and total smoke release of the PA6/SiO2@[email protected] were reduced by 10.7% and 19.3%, respectively, compared to those of PA6 film. This work provides a new paradigm for creating a multifunctional PA6 film composite with high performance for grain preservation and loss reduction.