| Lanthanide Metal-Organic Frameworks（Ln-MOFs）combine the unique topological structure of Metal-Organic Frameworks（MOFs）with the excellent luminescent properties of lanthanide metal ions,exhibiting a range of advantages such as sharp characteristic emission bands,large Stokes shifts,long excited state lifetimes,high quantum yields,and high color purity.Furthermore,lanthanide metal ions also possess high coordination numbers and flexible coordination environments,given their exceptional properties,Ln-MOFs have great potential applications in sensing,anti-counterfeiting,catalysis,gas storage and separation,magnetism,and other fields.However,Ln-MOFs have poor maneuverability and stability in complex environments such as water and acidic/alkaline media due to the crystallization properties,which disrupts its relatively weak Ln-O coordination bonds,reduces its luminescence,and limits its application range.Growing efforts have been focused on improving the processability of Ln-MOFs by performing pre-/post-synthetic modification of Ln-MOFs or blending with other functional materials（such as polymers,metal particles,carbon nanotubes）.Currently,the hybridization of Ln-MOFs with polymer materials has been attracted extensive attention,owing to the multiple unique properties of polymer materials,such as continuity,flexibility,chemical stability,strong plasticity,and compatibility.Polymers could be used to further enhance Ln-MOFs performance,develop non-native functionalities,and expand the range of practical applications.Despite there are already some attractive synthetic methods,the ligand synthesis and operation steps are cumbersome,may affect the original physical and chemical properties of MOFs.Based on this,this paper adopts a simple synthesis strategy to combine the[Ln2（atpt）3（phen）2（H2O）]n（Ln=Eu,Tb）and Zn/La-BTC with different polymers.As a result,these studies successfully obtained Ln-MOFs polymer composites with temperature sensing properties and MOF-based epoxy resin composites with high-efficiency flame retardancy properties.Furthermore,the corresponding properties and applications of the prepared composites were extensively investigated.The specific research contents are as follows:（1）A stable multi-range temperature sensor,Tb-MOFs@TGIC,was prepared by combining Tb-MOFs（[Tb2（atpt）3（phen）2（H2O）]n）with TGIC curing agent through a thermmal curing with covalent bonding strategy.The synthesized Tb-MOFs@TGIC composite exhibited superior luminescence properties compared to the parent Tb-MOFs,including fluorescence intensity,lifetime,and quantum yields.Moreover,the Tb-MOFs@TGIC composite demonstrates excellent temperature sensing performance and stability across a broad range of temperatures,including low,physiological,and high temperatures.Additionally,Tb-MOFs@TGIC can be conveniently coated onto various substrates and exhibits different temperature sensing capabilities,which improving the processing capacity of Tb-MOFs powder and showcasing its potential as a temperature sensor piece.（2）The Ln MOFs-MA-BMA（Ln=Eu,Tb）hybrid films with temperature sensing capabilities were successfully prepared through photo-induced post-synthesis polymerization strategies.The copolymerization reaction enhanced the interaction between Ln-MOFs and the polymers components,enabling the uniform dispersion of Ln-MOFs-MA in the polymer matrix,thereby obtaining a uniform and processable Ln MOFs-MA-BMA composite film.The emperature sensing properties of Eu MOFs-MA-BMA and self-calibrated Eu0.001Tb0.999-MOFs-MA-BMA hybrid films were explored,which showed excellent temperature sensing performance with a maximum relative thermal sensitivity（Sr）of 5.22%·K-1（267 K）and 3.91%·K-1（227 K）,respectively.Moreover,the Ln MOFs-MA-BMA composite membranes have favourable chemical stability in strong acid or base solution,which further expands the application of Ln-MOFs-based optical thermometers in different enviroments.（3）A composite flame retardant,Zn/La-BTC@DMMP,was prepared by combining two-dimensional layered Zn/La-BTC with the small molecule flame retardant DMMP through a simple and economical strategy.This effectively integrated the unique structure of MOFs with the efficient flame retardant of phosphorus-containing flame retardant.A series of tests demonstrated that the flame retardant and smoke suppression properties of EP composites with Zn/La-BTC@DMMP flame retardants were significantly improved.The flame retardation mechanism of the composite flame retardant was further investigated,the P-O-La coordination bond between the DMMP molecule and Zn/La-BTC can effectively slow down the release of DMMP,and the synergistic flame retardant effect of Zn/La-BTC and DMMP in condensed phase and gas phase catalyzed the formation of a thermally stable and dense carbon layer,effectively enhancing the fire resistance and smoke suppression of EP.At the same time,due to the good compatibility of Zn/La-BTC@DMMP and EP,the composite material maintained good mechanical properties.Additionally,the composite flame retardants improved the dielectric constant and dielectric loss of EP composites,expanding the potential applications of EP composites in electronic packaging. |
