In this study, three kinds of carbon nanofiber sheets were made through a high-pressure filtration system: pure carbon nanofiber, carbon nanofiber with polyhedral oligomeric silsequioxane (PCNS) and carbon nanofiber with Cloisite Na+ clay (CCNS). Then these sheets were incorporated onto the surface of glass fiber reinforced polyester composites through resin transfer molding process. The samples were analyzed with scanning electron microscopy (SEM), thermal gravimetric analyses (TGA). The fire retardant performance of the laminates was evaluated with cone calorimeter test at an external radiated heat flux of 50kw/m2. The results of laminates with PCNS indicated that the fire performance was impaired when comparing with the case of pure carbon nanofiber paper. However, in the case of CCNS, the primary results showed a pronounced improvement of the fire performance was observed. The possible mechanism was also discussed in the present study.

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