Effect of Degassing Time on Aggregation Structure and Chain Structure of XLPE Cable Insulation Material

doi:10.7652/xjtuxb201804003

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Effect of Degassing Time on Aggregation Structure and Chain Structure of XLPE Cable Insulation Material

更新时间：2025-07-09

- Effect of Degassing Time on Aggregation Structure and Chain Structure of XLPE Cable Insulation Material
- Vol. 52, Issue 4, Pages: 15-23(2018)
- 作者机构：
  
  西安交通大学电力设备电气绝缘国家重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201804003
  CLC： TM247
- Online First：10 April 2018，
  
  Published：2018
- 稿件说明：
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Effect of Degassing Time on Aggregation Structure and Chain Structure of XLPE Cable Insulation Material[J]. 2018, 52(4): 15-23.
DOI：

Effect of Degassing Time on Aggregation Structure and Chain Structure of XLPE Cable Insulation Material[J]. 2018, 52(4): 15-23. DOI： 10.7652/xjtuxb201804003.

摘要

通过对完整切段交联聚乙烯(XLPE)电缆进行实验室脱气处理

在不同脱气处理时间下对其绝缘层材料XLPE进行了红外光谱测试、差示扫描量热分析(DSC)、扫描电镜分析(SEM)、交联度测量及拉伸测试

研究XLPE中交联副产物含量、聚集态结构与链结构的变化。结果表明:XLPE中的交联副产物在脱气处理过程中得到了有效消除

其中苯乙酮含量随脱气处理进行至168 h大幅减少

而后趋势变缓至336 h后不再显著变化; 枯基醇减少速度缓慢

随脱气处理进行至336 h后减少趋势才变缓

说明XLPE电缆合理脱气时间应在168～336 h内。脱气处理前期

XLPE电缆绝缘材料内部自由基再交联

链结构发生变化

导致断裂伸长率增大

同时还产生晶核生成和晶粒生长两种聚集态结构变化的现象

新的小晶体出现

进一步促进断裂伸长率增大

且球晶生长完善

结晶度增大。其中链结构变化持续时间较短

聚集态结构变化持续时间较长

随着脱气处理的进行

这些变化在后期均趋于稳定。根据上述实验结果

提出了XLPE材料内部在脱气处理过程中的聚集态结构和链结构变化模型

对脱气处理过程中微观结构和宏观断裂伸长率变化进行了解释。

Abstract

The crosslinked polyethylene(XLPE)is degassed in laboratory

and the crosslinking by-products content

the aggregation structure and the chain structure are investigated by tensile test

degree of crosslinking measurement

infrared spectroscopy

differential scanning calorimetry(DSC)and scanning electron microscopy(SEM)at different degassing time. The results show that the crosslinking by-products are effectively eliminated during the degassing process

and the acetophenone content is significantly reduced after 168 h degassing

then the reduction rate slows down and remains unchanged until 336 h. However

the reduction rate of cumyl alcohol content is small

the degassing trend slows down after 336 h. Experimental results show that the optimum degassing time of XLPE cable is limited within 168-336 h. In the beginning of degassing

the free radicals inside XLPE insulation are cross-linked again and the chain structure changes

which increases elongation at break. And there are two kinds of aggregation structure changes in crystal nucleus formation and crystalline grain growth. The newly developed small crystals facilitate further promoting elongation at break

the spherocrystal growth becomes perfect

and the crystallinity increases. Moreover

the duration of chain structure changes for a shorter period while the duration of aggregation structure changes for a longer period

and those changes remain stable in the late degassing. According to the above experimental results

a change model of aggregation and chain structure of XLPE cable insulation in the degassing process is constructed

and the changes of microstructure and macroscopic elongation at break are explained.

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references

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