PE-HD-g-MAH对PA66/PE-UHMW共混物力学与摩擦学行为的影响

用马来酸酐接枝高密度聚乙烯（PE-HD-g-MAH）与聚酰胺66（PA66）/超高相对分子质量聚乙烯（PE-UHMW）共混制备了共混物，并利用扫描电子显微镜、动态机械分析仪、毛细管流变仪和傅里叶红外光谱分析对共混物的力学性能及摩擦学性能进行了研究。结果表明，加入PE-HD-g-MAH可以促进PA66和PE-UHMW的界面相容性，提高了共混物的拉伸、弯曲与冲击性能；随着PE-HD-g-MAH含量的增加，共混物的摩擦因数逐渐降低；加入PE-HD-g-MAH并未使共混物发生摩擦化学反应，共混物的磨损呈现疲劳磨损特征；加入PE-HD-g-MAH抑制了疲劳裂纹的增长，使得摩擦转移膜逐渐均匀。

Effect of PE-HD-g-MAH on the Friction and Wear Behavior of PA 66/PE-UHMW Blends

High density polyethylene was grafted with maleic anhydride (leading to PE-HD-g-MAH), which was introduced into blends of ultra high molecular weight polyethylene (PE-UHMW) and polyamide 66 (PA66) to improve its mechanical and tribological behavior. The micro-structure, wear and friction transfer film surface of the blends were analyzed using SEM, the viscoelastic behavior of the blend were tested using the DMA and capillary rheometer, the chemical characteristic peaks of the blends were analyzed using FT-IR before and after friction. It showed that PE-HD-g-MAH improved the compatibility between PA66 and PE-UHMW and the tensile, bending, and impact strengths were improved. With increasing PE-HD-g-MAH, friction coefficient of the blends decreases gradually. No chemical reaction occurred during the frictional process. PE-HD-g-MAH also improved the temperature resistance of the blend. The fatigued wear was shown on the worn surface. The addition of PE-HD-g-MAH inhibits the growth of fatigue crack, so that the homogeneous transfer film became uniform gradually.