The various properties of polyethylenes used for XLPE cable insulations were evaluated, and followings were cleared out. At first, as for the rheological characteristics, the molecular weight distribution is different among the polyethylenes which show the same MFR values. Secondly, as for the crosslinking characteristics, the number of several chemical functional groups in polyethylene molecules are different between that of before and after the crosslinking. And relations are observed between the crosslinking reactivity and the number of some specific double bond. Melting temperature decreases in contrast with the increase of the degree of crosslinking, which is due to the decrease of crystallinity of polyethylene. Thirdly, in terms of breakdown strengthes, they are also affected with the degree of crosslinking, especially in the high temperature regions. This is due to the increase of elastic modulus brought by the network formation with crosslinking reaction.
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