UHMWPE的接枝改性及其与Nano-PTFE复合材料的摩擦学性能  

Graft Modification of UHMWPE and Tribological Properties of the Graft UHMWPE Composites with Nano-PTFE

作　　者：李东亮[1] 魏刚[1] 黄亚[1] 邓小亮[1] 曾文浩[1] 

机构地区：[1]西华大学材料科学与工程学院,四川成都610039

出　　处：《塑料工业》2015年第4期15-18,共4页China Plastics Industry

基　　金：教育部春晖计划项目资助(Z2011079)

摘　　要：通过紫外光引发聚合将全氟烷基乙基甲基丙烯酸酯共聚物(PFAMAE)单体接枝到超高摩尔质量聚乙烯(UHMWPE)上,制备出超高摩尔质量聚乙烯接枝全氟烷基乙基甲基丙烯酸酯共聚物(UHMWPE-g-PFAMAE)。再采用热压成型法制备出UHMWPE-g-PFAMAE/纳米聚四氟乙烯(nano-PTFE)复合材料。采用红外光谱(FTIR)对接枝前后的UHMWPE进行表征,并借助磨损试验机和扫描电子显微镜(SEM)考察了UHMWPE、UHMWPE-g-PFAMAE和UHMWPE-g-PFAMAE/nano-PTFE复合材料的摩擦学性能和机理。结果表明,PFAMAE单体已成功接枝到UHMWPE上;与纯UHMWPE相比,UHMWPE-g-PFAMAE的摩擦因数和磨损率均明显减小;在UHMWPE-g-PFAMAE中加入nano-PTFE后,复合材料的摩擦因数和磨损率进一步降低,当nano-PTFE质量分数为1%时,复合材料的性能最佳。接枝改性有效抑制了纯UHMWPE的磨粒磨损和塑性变形,加入适量的nano-PTFE,UHMWPE-g-PFAMAE/nano-PTFE复合材料仅表现为轻微的疲劳磨损。Perfluorinated alkyl ethyl methacrylate （PFAMAE） monomer was grafted onto ultra-high molecular weight polyethylene （ UHMWPE ） by UV initiated polymerization and ultra-high molecular weight UHMWPE-g-PFAMAE was got. Then UHMWPE-g-PFAMAE/nanometer polytetrafluoroethylene （nano- PTFE） composites were prepared by hot compression molding. UHMWPE before and after grafting were characterized by Fourier transform infrared. With the wear tester and scanning electron microscope, tribological properties and the friction mechanism for UHMWPE, UHMWPE-g-PFAMAE and UHMWPE-g- PFAMAE/nano-PTFE composites were investigated. The results showed that the PFAMAE monomer was successfully grafted onto UHMWPE. The friction coefficient and wear rate of UHMWPE-g-PFAMAE were reduced obviously as compared with pure UHMWPE. After nano-PTFE was added to the UHMWPE-g- PFAMAE, the friction coefficient and wear rate of the composites were further decreased. The optimum performances of composites were obtained with the nano-PTFE mass fraction of 1%. The abrasive wear and plastic deformation were effectively abated for UHMWPE after graft modification. UHMWPE-g-PFAMAE/ nano-PTFE composites with a moderate amount of nano-PTFE showed only slight fatigue wear behavior.

关 键 词：超高摩尔质量聚乙烯 接枝改性 纳米聚四氟乙烯 摩擦学性能 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]