利用β成核剂对聚丙烯（PP）进行改性，制成β成核质量分数为5%的PP母粒。PP母粒与PP按照不同配比注塑成PP标准样条，并对PP样条进行力学性能测试。结果表明：β成核剂对均聚PP 1100N有极大的增韧作用。当β成核剂添加质量分数为0.02%时，常温缺口冲击强度由5.0 kJ/m²增加至9.1 kJ/m²，提高了82%；在β成核剂添加质量分数为0.15%时，常温缺口冲击强度达到最大，从原来的5.0 kJ/m²增加至11.5 kJ/m²，提高了130%。低温冲击强度随着β成核剂添加量的增加而增加，从2.0 kJ/m²增加至2.6 kJ/m²，提高了30%。β成核剂的加入影响材料的拉伸性能。在β成核剂质量分数为0.05%时，拉伸强度达到最大的30.98 MPa，与未添加的空白样相比，拉伸强度提高了13.27%，断裂伸长率也由708.95%提高至1 060.00%以上。β成核剂的加入影响材料的弯曲性能，降低材料的刚性，但影响程度不大。

The polypropylene (PP) was modified by β-nucleating agent to prepare PP masterbatch with the β-nucleating mass fraction of 5%. The PP masterbatches are then injection molded with PP in various ratios to form PP standard test specimens, which are subsequently subjected to mechanical property testing. The results showed that the β-nucleating agent had a significant toughening effect on the homopolymer PP 1100N. When the mass fraction of β-nucleating agent is 0.02%, the notched impact strength at room temperature increases from 5.0 kJ/m² to 9.1 kJ/m², with an increase of 82%. At a mass fraction of 0.15%, the notched impact strength at room temperature reaches its maximum, increasing from the original 5.0 kJ/m² to 11.5 kJ/m², with an increase of 130%. The low-temperature impact strength also increases with the addition of β-nucleating agents, from 2.0 kJ/m² to 2.6 kJ/m², with an increase of 30%. The incorporation of β-nucleating agents affects the tensile properties of the material. At a mass fraction of 0.05% of β-nucleating agent, the tensile strength reaches a maximum of 30.98 MPa, which is a 13.27% increase in tensile strength compared to the blank sample without addition, and the elongation at break also increases from 708.95% to over 1 060.00%. The addition of β-nucleating agents affects the bending properties of the material and reduces its rigidity, but the impact is not significant.