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Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene
| 更新时间：2026-07-29
|
Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene
- CIESC Journal (2026)
- 作者机构：
北京怀柔实验室，北京101400
- 作者简介：
- 基金信息：
DOI：10.11949/0438-1157.20260079
CLC： TQ 322.2Received：17 January 2026，
Revised：2026-07-28，
Accepted：29 July 2026，
- 稿件说明：
移动端阅览
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.
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.
Effect of Vinyl Double Bond Content on Cross-linking Properties of Low-Density Polyethylene
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.
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