Fuente: Journal of applied polymer Lugar: RESEARCH ARTICLE A novel yttrium-based metal–organic framework (Y-MOF) was successfully prepared via a solvothermal method and applied as a flame retardant for epoxy resin. The composite EP-1 shows significantly reduced heat and smoke release, as well as improved thermal stability and mechanical properties, demonstrating its excellent flame-retardant efficiency.

ABSTRACT
This paper developed a rare-earth metal–organic framework (MOF) flame retardant and applied it to epoxy resin (EP). This process utilized hexa (4-carboxyphenoxy) cyclotriphosphazene as the organic ligand and yttrium nitrate hexahydrate as the rare-earth metal source to prepare a novel Yttrium-based MOF (Y-MOF) via a solvothermal method. The Y-MOF synthesized under optimal conditions was characterized using scanning electron microscopy (SEM) and Fourier-transform infrared spectroscopy (FT-IR). Thermogravimetric Analysis (TGA) and cone calorimetry (CCT) results indicate EP-1 exhibits excellent thermal stability with a high char residue of 12.25%. Concurrently, EP-1 reduces peak heat release rate (PHRR) and total heat release (THR) by 51.56% and 26.23%, respectively. Total smoke production (TSP) decreased by 10.23%, while peak CO production rate (PCOP) and peak CO2 production rate (PCO2P) decreased by 55.26% and 55.43%, respectively. The tensile strength and impact strength are 3.49% and 19.32% higher than those of pure EP, respectively.