乙烯基双键含量对低密度聚乙烯交联特性影响研究

罗开强; 田明策; 孙楷越; 蔺道雷; 戴煕瀛; 杨威; 张勇杰

doi:10.11949/0438-1157.20260079

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乙烯基双键含量对低密度聚乙烯交联特性影响研究

材料化学工程与纳米技术 | 更新时间：2026-07-29

- 乙烯基双键含量对低密度聚乙烯交联特性影响研究
- Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene
- 化工学报 2026年
- 作者机构：
  
  北京怀柔实验室，北京101400
- 作者简介：
  
  罗开强（1993-），男，博士，luokaiqiang@bise.hrl.ac.cn
  张勇杰（1986-），男，博士，副教授，yjzhang@dlpu.edu.cn
- 基金信息：
  
  智能电网重大专项（2030）资助(2024ZD0800100)
- DOI：10.11949/0438-1157.20260079
  中图分类号： TQ 322.2
- 收稿：2026-01-17，
  
  修回：2026-07-28，
  
  录用：2026-07-29，
- 稿件说明：
移动端阅览
罗开强, 田明策, 孙楷越, 等. 乙烯基双键含量对低密度聚乙烯交联特性影响研究[J/OL]. 化工学报, 2026.

LUO Kaiqiang, TIAN Mingce, SUN Kaiyue, et al. Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene[J/OL]. CIESC Journal, 2026.
罗开强, 田明策, 孙楷越, 等. 乙烯基双键含量对低密度聚乙烯交联特性影响研究[J/OL]. 化工学报, 2026. DOI： 10.11949/0438-1157.20260079.

LUO Kaiqiang, TIAN Mingce, SUN Kaiyue, et al. Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene[J/OL]. CIESC Journal, 2026. DOI： 10.11949/0438-1157.20260079.

摘要

低密度聚乙烯（LDPE）是电缆绝缘层核心原材料，其交联特性对电缆性能影响显著。乙烯基双键（VDB）含量是影响LDPE交联特性的关键因素；然而，由于LDPE合成过程复杂，直接通过聚合制备VDB单变量梯度变化的LDPE极其困难。因此，文献中缺乏VDB含量对LDPE交联特性影响的深入系统研究。本文通过催化加氢方法制备了系列VDB含量单变量梯度变化的LDPE基料，并系统研究了VDB含量对其交联特性的影响规律。结果表明，高VDB含量LDPE的焦烧时间和硫化时间缩短，交联反应速率更快，且交联聚乙烯（XLPE）具有更高的交联密度与凝胶含量，交联效率更高。量子化学计算表明，VDB能降低相邻C‑H键的解离能，促进自由基生成，提高交联反应活性。此外，XLPE的结晶温度、熔融温度及结晶度均较LDPE显著下降，且下降幅度随交联度的提高而增大，表明交联网络抑制了链段运动及其有序排列。综上，调控VDB含量是优化LDPE交联性能的有效途径，为高压电缆用LDPE的分子结构设计提供了重要理论依据。

Abstract

Low-density polyethylene (LDPE) is a core raw material for cable insulation layers

and its cross-linking characteristics significantly influence cable performance. The vinyl double bond (VDB) content in LDPE is a key factor influencing its cross-linking characteristics. However

due to the complexity of the LDPE synthesis process

it is extremely difficult to directly prepare LDPE with a single-variable gradient of VDB content through polymerization. Consequently

there is a lack of in-depth and systematic studies in the literature on the influence of VDB content on the cross-linking behavior of LDPE. In this study

a series of LDPE materials with a single-variable gradient of VDB content were prepared via catalytic hydrogenation

and the influence of VDB content on their cross-linking characteristics was systematically investigated. The results show that LDPE with high VDB content exhibits shorter scorch time and curing time

faster cross-linking reaction rate

and higher cross-linking density and gel content in the resulting cross-linked polyethylene (XLPE)

indicating higher cross-linking efficiency. Quantum chemical calculations reveal that VDB can reduce the dissociation energy of adjacent C-H bonds

promoting radical generation and thereby enhancing cross-linking reactivity. Additionally

the crystallization temperature

melting temperature

and crystallinity of XLPE are significantly lower than those of LDPE

with the extent of reduction increasing with higher cross-linking density

indicating that the cross-linked network inhibits chain segment mobility and ordered arrangement. In conclusion

regulating VDB content is an effective approach to optimizing the cross-linking performance of LDPE. This study provides an important theoretical basis for the molecular design of LDPE used in high-voltage cables.

关键词

Keywords

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