石墨烯基联四唑含能配位聚合物的制备, 表征及催化活性

Several novel GO based bis tetrazole energetic coordination polymers (ECPs) were designed and prepared by solvothermal method, which contain cobalt(Ⅱ) and nickel(Ⅱ) as coordination center, 5, 5' bis tetrazole(H₂BT) and 5, 5 bis tetrazole 1, 1 dioldehydrate (DHBT) as ligand. The coordination polymer crystal can be controlled through regulating the experimental conditions. Five typical promising catalysts of GO Co DBT, GO Co BT, GO Ni DBT, α GO Ni BT and β GO Ni BT were characterized by XRD(X ray diffraction), XPS(X ray photoelectron spectroscopy), SEM(scanning electron microscope)/EDS(Energy Dispersive Spectrometer) and DSC(differential scanning calorimetry) TG(Thermogravimetric Analysis) techniques. DSC TG results of GO Co DBT, GO Co BT, GO Ni DBT, α GO Ni BT indicate that GO based bis tetrazole energetic coordination polymers could reduce crystal defect, then lower the hot pot and improve thermostability, so the dicomposition temperatures of GO Co DBT, GO Ni DBT and GO Ni BT are all above 200℃. These ECPs as energetic catalysts have significant catalytic effect on thermal decomposition of AP and RDX. The reason can be that more O elements being transferred to react with NH₄ ⁺ results in increasing the yields of NH₃ and H₂O, which also made two decomposition peaks of AP overlap and the whole heat release increase. The heat releases of AP and RDX catalyzed by graphene templated bis tetrazoles are 2757.0 J•g^-1 and 2898.0 J•g^-1 respectively, which improve more than 50% compared with pure AP and RDX. The endothermic peak of AP corresponding to the crystal transformation is also reduced to 23.2 kJ•mol^-1. Prepared GO based bis tetrazole energetic coordination polymers could enhance thermostability and decomposition efficiency of AP and RDX.