交联聚乙烯交联度和结晶度对水树生长的作用机制

Influence Mechanism of Crosslinking Degree and Crystallinity of XLPE on Water Tree Propagation

为深入理解交联聚乙烯(XLPE)材料交联度对材料中水树生长的影响,研究了不同交联度XLPE样本中水树的尺寸,并结合交联度和结晶度观测结果对水树生长特征进行分析。结果表明:随着XLPE试样交联度的升高,其结晶度呈下降趋势,在交联度高于80%时,结晶度显著下降。随着试样交联度的升高,水树长度先减小后增大,在交联度为80%时,水树尺寸最小。水树生长是交联和结晶共同作用的结果。

In order to understand the effect of crosslinking degree of XLPE on the water tree propagation in material,the water tree size in XLPE samples with different crosslinking degree were studied,and the water tree propagation characteristics were analyzed combining with the test results of crosslinking degree and crystallinity.The results show that with the increase of the crosslinking degree of XLPE sample,its crystallinity decreases,and when the crosslinking degree is above 80%,the crystallinity decreases significantly.With the increase of the crosslinking degree of sample,the water tree length decreases at first and then increases,and when the crosslinking degree is 80%,the water tree size is the minimum.Water tree propagation is resulted from the combined effect of crosslinking degree and crystallinity.