一种阻燃型铜基金属有机框架材料的制备及在环氧树脂中的性能OA

A copper-based metal-organic framework(Cu-MOF)with schiff base organic ligand 4,4'-[1,4-phenyl-enebis(methanylylidene)bis(nitrilo)]dibenzoic acid(TBPA)was first synthesized via ultrasound-assisted and hydrothermal methods.Then,a flame-retardant Cu-MOF derivative(Cu-MOF@DOPO)was prepared by reacting Cu-MOF with a reactive flame retardant 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide(DOPO).The Cu-MOF@DOPO was confirmed by multiple characterization techniques,including scanning electron microscopy(SEM),transmission electron microscopy(TEM),and X-ray diffraction(XRD).The effect of Cu-MOF@DOPO on flame retardant,mechanical and thermal properties of epoxy resin(EP)was investigated.The results indicated that EP containing 2%(mass fraction)Cu-MOF@DOPO(EP/2MD)had a limiting oxygen index(LOI)of 29.6%and achieved a UL-94 V-0 rating.Meanwhile,the peak heat release rate(pHRR)and total heat release(THR)of EP/2MD decreased by 14.2%and 8.1%,respectively,while the total smoke production(TSP)slightly deceased compared with those of pure EP.During combustion,Cu-MOF@DOPO in EP exerted its flame-retardant action both in the condensed phase and the gas phase.Compared with the EP composites filled with Cu-MOF or the flame-retardant ligand TBPA-DOPO,the EP/Cu-MOF@DOPO composites exhibited a higher glass transition temperature and enhanced mechanical properties.