Excellent role of Cu2O on fire safety of epoxy resin with ammonium polyphosphate based on the construction of self‐intumescent flame retardant system
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Abstract
Abstract This work reports an effective self‐intumescent flame retardant system for epoxy resin (EP) based on the remarkable synergistic effect between Cu 2 O and ammonium polyphosphate (APP). The effect of Cu 2 O/APP on improving EP's fire performance was evaluated by limited oxygen index (LOI), UL‐94, and cone calorimeter test. The optimal mass ratio of Cu 2 O: APP was shown to be 2:8. With 15 wt% total flame retardant loading, the EP with optimum Cu 2 O/APP formulation reached V‐0 classification and high LOI (33.5%), while the EP with APP only got NR and low LOI (26.5%). Additionally, the pHRR, total heat release, total smoke production, CO production of the EP with optimum Cu 2 O/APP formulation were primarily decreased. All the improvements were ascribed to the formation of the self‐intumescent char layer of EP resulted from the catalyzing effect of Cu 2 O for char formation and CO to CO 2 conversion. These findings will consolidate approaches for conferring flame retardancy to flammable polymers or their blends.
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