Study On Mechanical Properties Of Nano-Sb₂O₃/Carbon Fiber Reinforced Polypropylene Composites

With the development of technology and natural resources decreasing,more and more polypropylenes?PP?have been used to industrial production and our life.The PP possesses excellent mechanical properties,electrical insulation properties,corrosion resistances,and outstanding plasticity.However,polypropylene is fragile under low temperate.So,in order to promote their comprehensive performances,make PP was widely used in various fields,it can be modified by filling nanoparticles and fiber products.In this study,nano-Sb₂O₃/BEO-PP,Sb₂O₃/BEO-PP and Sb₂O₃/CFs/BEO-PP composites were prepared by ball milling and melt blending.The tensile and impact properties of the composites were also tested.The surface morphology of the tensile and impact fracture surfaces was obtained by scanning electron microscope?SEM?and was used to study the toughening mechanism of nano-particles and CFs to PP.The crystallization properties of nano-Sb2O3/BEO-PP,Sb₂O₃/CFs/PP and Sb₂O₃/CFs/BEO-PP composites were investigated by XRD and DSC.Finally,the effects of crystallization properties on the mechanical properties were discussed and the results as follows:1.Nano Sb₂O₃ has been successfully modified by KH550,when nano-Sb₂O₃ particles was added to the PP matrix,the dispersion of nanoparticles in the PP matrix and the interfacial compatibility between the nanoparticles and the matrix have been significantly improved.2.Nano Sb₂O₃ has different effects on the mechanical properties of Sb₂O₃/BEO-PP composites with different mass fraction.With the increase of Sb₂O₃ particle content,the mechanical properties of Sb₂O₃/BEO-PP composites are gradually enhanced,and the mechanical properties of nano Sb₂O₃/BEO-PP composites are gradually reduced after the nano Sb₂O₃ mass fraction exceeds 2%;meanwhile,nano Sb₂O₃ is in PP.As the heterogeneous nucleation point in the matrix,the crystallinity of the PP matrix can be improved and the grain refined.The mechanical properties of3.CFs/BEO-PP composites reach the maximum when the mass fraction of CFs is 4%,and the tensile strength and Young's modulus are all greatly improved,which shows that CFs has a good toughening and strengthening effect on the PP matrix.4.Sb₂O₃/CFs/BEO-PP composites reach the maximum when the mass fraction of Sb₂O₃is 2%and CFs is 4%,respectively.At this time,the composite has the best toughness,and the impact strength of the Sb₂O₃/CFs/BEO-PP composite material reaches the maximum when the mass fraction of Sb₂O₃ is 3%and the CFs mass fraction is 4%,the strength is the best of composite material at this time.