Abstract
In order to study the flame retardant properties of hydroxylated multi-walled carbon nanotubes (MWCNTs-OH) modified barium phenolic resin (PR), MWCNTs-OH modified PR composites was prepared by in situ polymerization method. Thermal stability and flame retardancy of PR composites were studied by oxygen index (OI), thermo gravimetric(TG) analyzer, cone calorimeter and thermal field emission scanning electron microscope (FESEM). The results showed the OI increased by 3.6% when 0.2 wt% MWCNTs-OH was added, and the residual carbon increased by about 6.1%. The temperature at weight loss of 20% increased by nearly 5 °C and the apparent activation energy(AAE) increased by 11.052 kJ mol−1 with MWCNTs-OH of 0.2 wt% at high temperature stage. And pHRR of the sample decreased by 21.4%; time to ignition was delayed by 20 s. The proper amount of MWCNTs-OH could promote the formation of carbon layer during the pyrolysis of PR so to strengthen the ability to block heat transfer to improve the flame retardancy.
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