交联改性是聚乙烯改性的重要方法之一。文章系统研究了交联程度和树脂结构对交联高密度聚乙烯（XHDPE）的流变特性、交联特性、结晶性能和力学性能等影响。结果表明：交联剂质量分数由0增大至1.2%，XHDPE的最大储能模量（G'_max）和凝胶含量增大，损耗因子最小值（tanδ _min）逐渐减小。随着交联剂含量的增加，XHDPE的结晶度和晶粒尺寸降低，结晶能力降低。加入交联剂后，XHDPE的拉伸屈服强度逐渐降低，断裂伸长率先增大后减小，冲击强度显著改善。相同交联剂含量下，提高基础树脂分子量，XHDPE的储能模量逐渐增大，大分子网络黏弹性增大。高分子量HDPE的断裂伸长率达到最大时，其所需交联剂含量更低。高分子量的HDPE基础树脂有利于交联样品的力学性能提升。

Crosslinking modification is one of the important methods of polyethylene modification. The effects of crosslinking degree and resin structure on rheological properties, crosslinking properties, crystallization properties and mechanical properties of crosslinked high density polyethylene (XHDPE) were studied. The results show that when the mass fraction of crosslinking agent increases from 0 to 1.2%, the maximum energy storage modulus (G'_max) and gel content of XHDPE increase, and the minimum value of loss factor (tanδ _min) decreases gradually. With the increase of the content of crosslinking agent, the crystallinity and grain size of XHDPE decreases, and the crystallization capacity decreases. After the addition of crosslinking agent, the tensile yield strength of XHDPE decreases gradually, the elongation at break increases first and then decreases, and the impact strength increases significantly. With the same content of crosslinking agent, the energy storage modulus of XHDPE and the viscoelasticity of macromolecular network increase gradually with the increase of molecular weight of base resin. When the elongation at break of high molecular weight HDPE reaches the maximum, the content of crosslinking agent required is lower. High molecular weight HDPE base resin is beneficial to improve the mechanical properties of crosslinked samples.