目的 研究六钛酸钾晶须添加量的不同对聚丙烯复合材料力学性能的影响。 方法 采用硅烷偶联剂 KH550 改性六钛酸钾晶须(SPTW)，利用熔融共混法，将改性过的六钛酸钾晶须与聚丙烯(PP)、马来酸酐接枝聚丙烯(PP-g-MAH)熔融共混制得 PP/PP-g-MAH/SPTW 复合材料。 结果 比较不同含量的六钛酸钾晶须对复合材料力学性能的影响， 发现添加适量改性过的六钛酸钾晶须可明显改善复合材料的力学性能。随着六钛酸钾含量的不断增加，其弯曲强度也增大，当 SPTW 的质量分数为12%时，弯曲强度提高了 21.5%，随着含量的继续增加，弯曲强度开始下降；其拉伸强度和冲击强度都呈先增加后降低的趋势，在 SPTW 质量分数为 8.3%左右时，其拉伸强度和冲击强度分别提高了 19.7%和 31.8%。 结论 在聚丙烯中添加经硅烷偶联剂 KH550 改性的 SPTW，其质量分数为 12%时，力学性能最佳。

This work aimed to study the influence of different addition amounts of six potassium titanate whiskers (SPTW) on the mechanical properties of polypropylene composite. PP/PP-g-MAH/SPTW composite material was prepared by potassium titanate whiskers modified by silane coupling agent KH550, PP and PP-g-MAH with melt blending method. It was found that the mechanical performance of the composite was greatly enhanced when adding appropriate amount of modified SPTW through comparative test. The study showed that the bending strength, tensile strength and impact strength increased with the increasing SPTW content at first and then decreased as it continued to increase. The results indicated that the bending strength was increased by 21.5% with addition of 12% SPTW and that the tensile strength and impact strength were 19.7% and 31.8% respectively higher than before when the content of SPTW reached 8.3%. SPTW modified by silane coupling agent KH550 was added in polypropylene, the polypropylene has the best mechanical properties when SPTW's mass fraction was 12%.