Property of Polypropylene with Addition of Ammonium Polyphosphate Flame Retardant
Ammonium polyphosphate (APP)/polypropylene (PP) composites were prepared by melt blending and extrusion from a twin screw extruder.APP was used as a flame retardant for PP.FTIR,SEM,DTA and melting flow rate (MFR) were used to test and characterize APP/PP flame-retardant composites.Combustion performance and mechanical properties were also discussed.The effects of APP loading on melt flow rate,thermal behavior,crystallization behavior,mechanical properties and section structure of PP composites was further investigated.The results show that the addition of APP significantly reduced the combustion performance of PP,because APP effectively promoted the char formation and avoided droplet occurence.With the addition of APP,the thermal stability of APP/PP composites was increased,while MFR was decreased at first and then increased.The interface binding force between the flame retardant and the substrate was improved owing to heterogeneous nucleation of APP when APP loading was greater than 13％,which also inhibited the declining of the mechanical properties of APP/PP composites.
国家科技期刊平台
NSTL
万方数据
维普
