Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE The combination of lysine-based flame-retardant and modified GO (GO grafted by PEG) can endow PLA with superior flame retardancy, mechanical properties, and UV resistance.

ABSTRACT
Polylactide (PLA), as a prominent bio-based polymer, has garnered significant interest. However, its high flammability and inherent brittleness hinder broader applications. While bio-based flame-retardant systems have been developed to preserve PLA's environmental compatibility, the associated degradation of mechanical performance remains a critical limitation. This study addresses these challenges by engineering a bio-based flame-retardant hybrid composed of DL (synthesized from lysine and diethylenetriamine penta-methylenephosphonic acid via aqueous-phase chemistry) and graphene oxide (GO). To enhance dispersion within the PLA matrix, GO was surface-functionalized with polyethylene glycol (PEG). The resulting PLA composite exhibits synergistic enhancements in flame retardancy, mechanical robustness, and UV shielding. PLA/4PEG-0.08GO/6DL achieves the UL-94 V-0 rating, the LOI value of 29.7%. Moreover, the impact strength was improved by 27.5% compared with pure PLA, and Young's modulus is increased from 3401 to 3630 MPa. In addition, the significantly improved UPF value and hydrolytic degradation behavior indicated its good anti-UV property and environmental friendliness. These results demonstrate the hybrid system's potential to balance sustainability, safety, and performance for advanced PLA applications.