改性玻璃纤维填充UHMWPE复合材料制备与性能研究

Preparation and properties of composite materials:modified glass fiber filled UHMWPE

采用醋酸乙烯酯(VAc)和甲基丙烯酸异辛酯(EHMA)原位聚合法包覆玻璃纤维(GF),制备了共聚物改性玻璃纤维GF/VAc-g-EHMA,将其填充到超高分子量聚乙烯(UHMWPE)中制备复合材料.考察了GF与改性单体质量比、GF长径比、偶联剂及GF填充量对填充UHMWPE复合材料机械性能的影响.选用长径比为4.8∶1~5.3∶1的GF,并以KH550预处理,以单体质量∶GF质量=1∶4比例进行原位聚合,所得的改性GF再按10%填充量加入UHMWPE时,所得复合材料性能较好.此时材料的拉伸强度为31.3MPa,断裂伸长率为435%,质量磨耗率低于0.14%.SEM观察表明,树脂和GF的结合较好.

Modified glass fiber(GF)filled UHMWPE composites were prepared via in-situ polymerization of vinyl acetate(VAc)and methyl iso-octyl methacrylate(EHMA).The effects of the mass ratio of monomer and GF,the aspect ratio of GF,coupling selection and the filler content on the mechanical properties were studied.When the aspect ratio of GF is 4.8∶1~5.3∶1,pretreated by KH550,Mm(monomer mass)∶Mg(GF mass)=1∶4in situ polymerization,and 10% addition of modified GF,the GF/VAc-g-EHMA composite show the highest values of mechanical properties.Tensile strength is 31.3MPa,elongation at break is 435%,the wear rate is lower than 0.14% by mass.The SEM results show the bonding quality between the GF and the matrix is good.The bonding manner between the filler and the matrix were further investigated with infrared spectroscopy