In-situ growth of metal-organic framework (Cu-UiO-66) within wood scaffold for improved flame retardancy

In this work, a novel Cu-UiO-66/wood composite was successfully fabricated by a facile in situ growth strategy, and the influence of Cu-UiO-66 metal-organic framework (MOF) loading on the wood substrate thermal stability and flame retardancy were investigated. Scanning electron microscopy images indicated that the octahedral Cu-UiO-66 microparticles were uniformly and firmly decorated on the lumen surface within the balsa wood scaffold. The incorporation of only 6.5 wt% Cu-UiO-66 MOF remarkably enhanced the thermal stability and flame retardancy of the natural wood. Compared with the untreated wood, the peak heat release rate of the Cu-UiO-66/wood composite exhibited a drastic decline by 73.1% from 94.5 to 25.4 W center dot g(-1) and the total heat release from 7.7 to 5 kJ center dot g(-1). Meanwhile, the treated wood had a strong self-extinguishing ability and the char residue rate of the Cu-UiO-66/wood is significantly increased by 132.7%. Therefore, this work provided an effective means of achieving the fire safety wood via introducing and constructing Cu-UiO-66 MOF flame retardants material.