PE⁃UHMW/海泡石纤维复合材料的力学性能与摩擦学性能研究

Mechanical and tribological properties of ultra⁃high molecular weight polyethylene/sepiolite fiber composites

采用硅烷偶联剂KH550对海泡石纤维(Sep)进行了改性,采用平板硫化机通过热压成型法制备了超高分子量聚乙烯(PE-UHMW)/Sep和PE-UHMW/改性海泡石纤维(O-Sep)复合材料,并通过红外光谱仪(FTIR)、电子万能试验机、扫描电子显微镜(SEM)等对Sep及O-Sep的表面结构和复合材料的力学性能、摩擦学性能及磨痕形貌进行了表征和测试。结果表明,O-Sep表面存在KH550分子,其在复合材料中分布比Sep更为均匀;当O-Sep含量达到6%(质量分数,下同)时,复合材料力学性能和摩擦学性能表现最佳,其拉伸强度、弯曲强度、弯曲模量和冲击强度分别为32.1 MPa,171.2 MPa、138.3 GPa和17.62 kJ/mm^(2),比纯PE-UHMW分别提高了41.4%、40.0%、95.6%和36.9%;其摩擦因数和磨损量分别为0.124和0.1 mg,比纯PE-UHMW分别提高了77.1%和80%。

Sepiolite fibers(Sep)were modified with a silane-coupling agent(KH550),and the ultra-high molecular weight polyethylene(PE-UHMW)/Sep and PE-UHMW/modified Sep(O-Sep)composites were prepared on a flat vul-canizer using a hot-pressing method.The surface structure of Sep and O-Sep and the mechanical and tribological properties of the composites were investigated using an infrared spectrometer,an electronic universal testing machine,and a scanning electron microscope.The results indicated that the KH550 molecules covered the surface of O-Sep,resulting in a uniform distribution of O-Sep in the composites.When the content of O-Sep fibers reached 6 wt%,the composites exhibited the optimal performance with tensile strength of 32.1 MPa,flexural strength of 171.2 MPa,flexural modulus of 138.3 GPa,and impact strength of 17.62 kJ/mm^(2),which were 41.4%,40.0%,95.6%,and 36.9%higher than those of pure PE-UHMW,respectively.The composites also revealed a friction factor of 0.124 and a wear amount of 0.1 mg,which were 77.1%and 80%higher than those of pure PE-UHMW,respectively.