Abstract
Metal phenylphosphonate (MPhP)/piperazine-reduced graphene oxide (PGO) nanomaterials with different metal centers (M = Ce, Al, Co, Zn) were facilely synthesized. We found that the morphology of metal-organophosphorus was controlled by the coordinated metal centers, trivalent metal-organophosphorus exhibited nanosheet morphology, while divalent metal-organophosphorus displayed nanorod morphology. In addition, the role of metal centers on the flame safety and mechanical performance of epoxy resin (EP) were studied. The limiting oxygen index values of EP composites with only 3 wt% of additive were increased in different levels (the CePhP-PGO/EP was increased most, up from 24.5% to 34.5%), and the MPhP-PGO/EP composites all pass UL-94 V-0 rating, which was owing to the multi-coordinating effect (physical shield of GO, the catalytic of metal and gas-phase effect of P-containing radicals). Specifically, we verified that P element of MPhP-PGO (M = Ce, Al) could act on both condensed and gas phase, while MPhP-PGO (M = Co, Zn) only acted in the condensed-phase, thus MPhP-PGO/EP (M = Ce, Al) showed better enhancing effect on flame retardancy of EP. Beyond that, MPhP-PGO/EP (M = Co, Zn) displayed more excellent mechanical properties, is due to MPhP (M = Co, Zn) (nanorod) which had good reinforcement effect to EP matrix.
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