Abstract: In order to study the performance of Indonesian oil sand tailings/polyethylene (HDPE) composites, scanning electron microscopy (SEM) and X⁃ray fluorescence spectrometry (XRF) were used to obtain the morphology, size and main component calcium carbonate (CaCO3), the main component of oil⁃sand tailings before and after modification, which is about 77.170%. And the surface was dried with different mass fractions of stearic acid, the best modifier content is 5%; the mechanical properties of oil sand tailings/HDPE composites were characterized by impact strength, tensile strength, elastic modulus and differential scanning calorimetry (DSC). The results show that with the increase of tailings filling, the oil sand tailings have obvious strengthening and toughening effect on HDPE. When the tailing sand content is 50%, the toughening effect is best. However, a large amount of oil sand tailings is distributed in HDPE to increase the defects in the matrix, and causes stress concentration phenomenon when subjected to external force, which results in the decrease of tensile strength. The crystallization property study shows that the addition of oil sand tailings has heterogeneous nucleation effect on polyethylene and enhances the toughness of composites.

Key words: Oil sand tailings, Surface modification, Composite material, Mechanical properties

摘要： 为了研究印尼油砂尾砂/聚乙烯（HDPE）复合材料的性能，采用扫描电子显微镜（SEM）、X射线荧光光谱分析（XRF）进行了分析，得出油砂尾砂改性前后形态、大小及主要成分碳酸钙（CaCO3）质量分数约为77.170%；用不同质量分数硬脂酸干法表面改性油砂尾砂，得出最佳改性剂质量分数为5%；通过冲击强度、拉伸强度、弹性模量和示差扫描量热分析仪（DSC）等表征分析油砂尾砂/HDPE复合材料的力学性能。结果表明，随着尾砂填充量的增加，油砂尾砂对HDPE有明显的增强增韧效果，当尾砂质量分数为50%时，增韧效果达到最好，但大量油砂尾砂分布在HDPE中，使基体中的缺陷增多，受到外力作用时产生应力集中现象致使拉伸强度下降。结晶性能研究表明，油砂尾砂的加入对聚乙烯具有异相成核的作用，增强复合材料的韧性。

关键词: 油砂尾砂, 表面改性, 复合材料, 力学性能