Synergistic Effect of OMMT/Mesoporous MCM-41 on Intumescent Flame Retardant Polypropylene

Different proportional polypropylene(PP)/intumescent flame retardant(IFR)/organic montmorillonite(OMMT)/MCM-41(without template) nano-composites were obtained by the melting method.Effect of nano-layered OMMT and dual nano-structured MCM-41(with nano-sized spherical particle and nano-sized hexagonal channel) on the properties of polypropylene composites was investigated. The results show that the flame retardancy properties of PP matrix can be improved obviously with the combination of OMMT,MCM-41 and IFR.A synergistic effect in flame retardancy is best when the ratio of OMMT/MCM-41 was 1:1.The tensile strength and impact strength reached the maximum,meanwhile, the LOI value was 34.2 and increased by 50%compared with pure PP.Furthermore the UL-94 rating rose to V-0 and the thermal stability was improved significantly compared with that of PP/IFR composite.