Layered double hydroxide/functionalized carbon nanotube in situ composite structure based synergistic flame retardant for epoxy resin
Epoxy resin(EP)is widely used as structural material on aircrafts.Exploring and designing high-performance flame re-tardants for EP is critical to the fire safety of civil aviation.In this study,nanosheets of MgAl layered double hydroxide(MgAl-LDH)were grown on the skeleton of interlaced functionalized CNTs(F-CNTs)to construct an in-situ composite structure of MgAl-LDH/F-CNTs.Then the MgAl-LDH/F-CNTs compos-ite structure was used as a mechanical support to further accom-modate CuMoO4 nanoparticles to obtain the synergistic flame re-tardant of MgAl-LDH/F-CNTs-CuMoO4.The built MgAl-LDH/F-CNTs in-situ composite structure can realize the uniform distribution of the flame retarding components(LDH nanosheets,functionalized carbon nanotubes and CuMoO4 nanoparticles)in the polymer substrate.Compared with pure epoxy resin without flame retarding treatment,the peak heat release rate of EP@MgAl-LDH/F-CNTs-CuMoO4 in the combustion test can be reduced by 40.5%,the total heat release can be lowered by 7.49%,the CO production and total smoke release can be respec-tively decreased by 43.0%and 26.3%,and the limiting oxygen index can be increased by 38.2%.It can be seen that the flame re-tarding performance of EP composite with flame retardant treat-ment is significantly improved.In addition,the tensile and bend-ing strengths are decreased by only 7.1%and 22.4%,indicating that the addition of F-CNTs and the construction of MgAl-LDH/F-CNTs composite structure can effectively compensate for the deteriorating effect of inorganic flame retardants on the mechani-cal strength of EP.
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