Transition metals with catalytic properties were expected to improve the fire resistance of the polymer. In this work, NiMoO4 nanorods decorated with Co-Ni layered double hydroxide (LDH) were fabricated and incorporated into polyurea (PUA) to improve the flame retardancy during combustion. Thermogravimetric analysis (TGA) showed that the addition of NiMoO4@Co-Ni LDH slightly decreased the initial degradation and the maximum degradation temperature. With increasing loading of NiMoO4@Co-Ni LDH, the char residue increased obviously. The combustion performance of PUA with 3.0 wt% NiMoO4@Co-Ni LDH investigated by cone calorimeter (CCT) showed that the peak heat release rate (PHRR), total heat release (THR) and smoke factor (SF) decreased by 34.41%, 12.68% and 48.65%, respectively. The existence of well-dispersed NiMoO4@Co-Ni LDH effectively enhanced the mechanical properties and flame retardant performances of PUA.
Keywords: Flame retardancy; NiMoO(4)@Co-Ni LDH; Polyurea; Thermal stability; Transition metal.
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