聚乙烯熔融指数对其交联特性及相应交联聚乙烯的性能影响

张益程; 罗开强; 李晓佩; 戴熙瀛; 张勇杰

doi:10.14028/j.cnki.1003-3726.2026.26.061

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聚乙烯熔融指数对其交联特性及相应交联聚乙烯的性能影响

研究论文 | 更新时间：2026-05-11

- 聚乙烯熔融指数对其交联特性及相应交联聚乙烯的性能影响
- Influence of the Melt Flow Index of Low-density Polyethylene on Its Crosslinking Characteristics and the Performance of Corresponding Crosslinked Polyethylene
- 高分子通报 2026年
- 作者机构：
  
  大连工业大学纺织与材料工程学院　大连 116034
  大连工业大学大连工业大学实验仪器中心　大连 116034
  北京智慧能源研究院　北京 102200
- 作者简介：
  
  luokaiqiang@bise.hrl.ac.cn
  yjzhang@dlpu.edu.cn
- 基金信息：
  
  国家电网有限公司科技项目资助(5500-202499387A-3-3-ZH)
- DOI：10.14028/j.cnki.1003-3726.2026.26.061
  中图分类号：
- 收稿：2026-02-04，
  
  录用：2026-04-09，
- 稿件说明：
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张益程, 罗开强, 李晓佩, 戴熙瀛, 张勇杰. 聚乙烯熔融指数对其交联特性及相应交联聚乙烯的性能影响. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.061

Zhang, Y. C.; Luo, K. Q.; Li, X. P.; Dai, X. Y.; Zhang, Y. J. Influence of the melt flow index of low-density polyethylene on its crosslinking characteristics and the performance of corresponding crosslinked polyethylene. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.061
张益程, 罗开强, 李晓佩, 戴熙瀛, 张勇杰. 聚乙烯熔融指数对其交联特性及相应交联聚乙烯的性能影响. 高分子通报, doi: 10.14028/j.cnki.1003-3726.2026.26.061 DOI：

Zhang, Y. C.; Luo, K. Q.; Li, X. P.; Dai, X. Y.; Zhang, Y. J. Influence of the melt flow index of low-density polyethylene on its crosslinking characteristics and the performance of corresponding crosslinked polyethylene. Polym. Bull. (in Chinese), doi: 10.14028/j.cnki.1003-3726.2026.26.061 DOI：

摘要

低密度聚乙烯(LDPE)熔融指数(MFI)对其交联特性及相应交联聚乙烯(XLPE)性能影响显著。然而，由于熔融指数单一变量梯度变化的LDPE难以获得，文献中缺乏LDPE熔融指数对其交联特性及相应XLPE性能影响的直接证据。本研究基于5种MFI单一变量梯度变化的LDPE，制备出LDPE/交联剂复配料，并采用无转子硫化仪及平板硫化机将复配料交联得到XLPE，系统研究了LDPE交联特性及XLPE结构性能关系。结果表明：LDPE熔融指数降低可延长焦烧时间(

)，但对硫化时间(

)无明显影响。XLPE交联度(

)及平均每条聚合物链中交联点数量(

)均随LDPE熔融指数升高而单调下降。随着XLPE交联度升高，其拉伸强度单调增加，抗蠕变性能逐渐提升，熔融温度呈上升趋势。本研究构建了“LDPE熔融指数−XLPE微观结构参数−XLPE宏观性能指标”映射关系，为合理设计LDPE熔融指数、提升XLPE综合性能提供了参考。

Abstract

The melt flow index (MFI) of low-density polyethylene (LDPE) significantly affects its crosslinking characteristics and the properties of crosslinked polyethylene (XLPE). However

owing to the difficulty in obtaining LDPE samples with gradient MFI values as the sole variable

the literature lacks direct evidence regarding the influence of the MFI of LDPE on its crosslinking characteristics and the performance of the resulting XLPE. Herein

based on five LDPE samples with gradient MFI values

a series of LDPE/crosslinking agent compounds were prepared and crosslinked to obtain XLPE using a rotorless rheometer and a flat-plate vulcanizing machine. The crosslinking characteristics of LDPE and the structure-property relationships of the resulting XLPE were systematically investigated. The results indicated that lowering the MFI of LDPE would lead to an extended scorch time (

)

while showing no significant effect on the curing time (

). Both the crosslinking degree (

) and the average number of crossli

nking points per polymer chain (

) in XLPE monotonically decreased as the MFI of LDPE increased. Mechanical property tests showed that both the tensile strength of XLPE and the resistance to creep monotonically enhanced with an increase in the D

of XLPE. Meanwhile

the melting temperature of XLPE decreases with a reduction in the degree of crosslinking. This study established a mapping relationship among the MFI of LDPE

the microstructural parameters of XLPE

and the macroscopic performance of XLPE

providing a reference for rationally designing the MFI of LDPE and enhancing the comprehensive performance of XLPE.

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references

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