Influence of Ketone-enol Isomerization of Phenyl Ketone Additives on the Electrical Properties of Polyethylene

Zi-lin Tian; Ming-jie Jiang; Xuan Wang

doi:10.11777/j.issn1000-3304.2026.26093

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Influence of Ketone-enol Isomerization of Phenyl Ketone Additives on the Electrical Properties of Polyethylene

更新时间：2026-07-27

- Influence of Ketone-enol Isomerization of Phenyl Ketone Additives on the Electrical Properties of Polyethylene
- Acta Polymerica Sinica Pages: 1-11(2026)
- 作者机构：
  
  哈尔滨理工大学高效能特种电缆技术全国重点实验室哈尔滨 150080
- 作者简介：
  
  Xuan Wang, E-mail: wangxuan@hrbust.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2026.26093
  CLC：
- CSTR：32057.14.GFZXB.2026.7640
- Received：26 March 2026，
  
  Accepted：26 May 2026，
  
  Online First：27 July 2026，
- 稿件说明：
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田紫麟, 蒋明洁, 王暄. 苯乙酮类添加剂酮-烯醇异构化对聚乙烯电性能的影响. 高分子学报, doi:10.11777/j.issn1000-3304.2026.26093.

Tian, Z. L.; Jiang, M. J.; Wang, X. Influence of ketone-enol isomerization of phenyl ketone additives on the electrical properties of polyethylene. Acta Polymerica Sinica (in Chinese), doi:10.11777/j.issn1000-3304.2026.26093.
田紫麟, 蒋明洁, 王暄. 苯乙酮类添加剂酮-烯醇异构化对聚乙烯电性能的影响. 高分子学报, doi:10.11777/j.issn1000-3304.2026.26093. DOI： CSTR： 32057.14.GFZXB.2026.7640.

Tian, Z. L.; Jiang, M. J.; Wang, X. Influence of ketone-enol isomerization of phenyl ketone additives on the electrical properties of polyethylene. Acta Polymerica Sinica (in Chinese), doi:10.11777/j.issn1000-3304.2026.26093. DOI： CSTR： 32057.14.GFZXB.2026.7640.

摘要

聚乙烯因其优异的电性能和良好的加工性，是一种重要的绝缘材料，芳香酮类化合物被广泛用作电压稳定剂以提高聚乙烯介电性能，然而其作用机理尚未取得共识. 本工作研究了苯乙酮及邻甲基苯乙酮这2种具有极小差异的分子用作电压稳定剂时，其酮-烯醇异构化行为对低密度聚乙烯电学性能的影响. 制备了含有不同质量分数添加剂的苯乙酮/聚乙烯，邻甲基苯乙酮/聚乙烯改性材料与纯低密度聚乙烯薄膜，对其进行宽温度区间击穿强度测试、电导特性测试及表面电位衰减测试. 结果表明，2种添加剂都提升了聚乙烯击穿和电导特性，其中对电导和陷阱的影响无明显差异. 而邻甲基苯乙酮对击穿特性的提高要优于苯乙酮，随着温度的降低，2种添加剂的效果逐渐接近，在测试下限温度下，无明显差距但仍优于基料. 分析表明，2类添加剂的差异来源于2种分子酮-烯醇异构化特性不同，且烯醇化行为并非使得击穿特性改善的唯一能量弛豫原因.

Abstract

Due to its excellent electrical properties and processability

polyethylene is an important insulating material. Aromatic ketone compounds are widely used as voltage stabilizers to enhance the dielectric performance of polyethylene

yet their mechanism of action has not reached a consensus. This work investigated the effect of keto-enol isomerization on the electrical properties of low-density polyethylene when two structurally similar molecules

acetophenone and

-methylacetophenone

were employed as voltage stabilizers. Materials of acetophenone/polyethylene and

-methylacetophenone/polyethylene with different mass fractions of ad

ditives

as well as neat low-density polyethylene films

were prepared. These films underwent breakdown strength tests over a wide temperature range

conductivity tests

and surface potential decay tests. The results showed that both additives improved the breakdown and conductivity characteristics of polyethylene

with no significant difference in their effects on conductivity and traps. However

-methylacetophenone outperformed acetophenone in enhancing breakdown performance. As the temperature decreases

the effectiveness of the two additives gradually converged; at the lower test temperature limit

their performance showed no clear gap

though both remain superior to the base material. Analysis indicates that the difference between the two types of additives stems from their distinct keto-enol tautomerization behaviors

and enolization is not the sole reason for the improvement in breakdown characteristics.

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