目的 研究MAH的质量分数对LDPE-g-MAH/PA6共混物拉伸强度的影响。方法 采用红外光谱分析仪和扫描电子显微镜等，研究MAH质量分数分别为0.03%，0.05%，0.1%，0.2%，0.3%时，其对LDPE-g-MAH接枝率、粘度及形态表征的影响，及其对LDPE-g-MAH/PA6共混物拉伸强度的影响。结果 在MAH质量分数为0.1%时，MAH单体接枝LDPE的接枝程度最高，接枝率为4.9%，且拉伸强度达到最大值。结论 MAH质量分数为0.1%时，LDPE-g-MAH/PA6共混性能、拉伸强度均达到最佳。

The work aims to study the effect of MAH mass fraction on the tensile strength of LDPE-g-MAH/PA6 blend. When MAH mass fractions were respectively 0.03%, 0.05%, 0.1%, 0.2% and 0.3%, infrared spectroscopy and scanning electron microscope, etc. were used to research the effects of MAH mass fractions on LDPE-g-MAH grafting ratio, viscosity and morphological characterization, as well as on the tensile strength of LDPE-g-MAH/PA6 blend. The results showed that when the MAH mass fraction was 0.1%, the grafting degree of MAH monomer grafted LDPE was the highest, with the grafting ratio of 4.9%, and the tensile strength reached its maximum. From all above, the conclusion is that the mixing property and tensile strength of LDPE-g-MAH/PA6 are the best when the MAH mass fraction is 0.1%.