Mechanical Properties and Flame Retardancy of SEBS-based Composites Filled with Magnesium Hydroxide

摘要

The flame-retardancy and mechanical properties of styrene-ethylene/butylene-styrene block copolymer(SEBS)based composites,containing SEBS blended with a paraffinic hydrocarbon extender oil,copolymer polypropylene(PP),and magnesium hydroxide(MH)or silane coupling agent surface-treated magnesium hydroxide(m-MH)were investigated.A maleic anhydride-grafted SEBS(MA-SEBS)was used as a polymer modifier for some composites.As the amount of MH or m-MH increased,the flame-retardancy of composites improved,while the tensile strength and elongation at break decreased,and the melt property of the composites became worse as well.When the oil-filled SEBS(O-SEBS)was partially replaced by MA-SEBS,the tensile strength of the composites increased,and elongation at break decreased.Furthermore replacing O-SEBS with MA-SEBS and treating MH with silane coupling agent(simultaneously)improved the tensile strength of the composites by a large margin.The phase structure of the composites was characterised using scanning electron microscopy(SEM)and this revealed that the particle-matrix interfacial bonding was improved through the addition of MA-SEBS.The stability of the composites was investigated by thermogravimetric analysis(TGA).