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首页> 外文期刊>Journal of Applied Polymer Science >Tunable morphology and resistivity of ternary polymer composites of carbon black/low density polyethylene/ethylene-vinyl acetate with carbon blacks having different surface properties
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Tunable morphology and resistivity of ternary polymer composites of carbon black/low density polyethylene/ethylene-vinyl acetate with carbon blacks having different surface properties

机译：具有不同表面性质的炭黑/低密度聚乙烯/乙烯 - 乙酸乙烯 - 乙酸乙烯 - 乙酸乙烯 - 乙酸乙烯 - 乙酸乙酯的可调谐形态和电阻率

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摘要

Medium to extra-high voltage electrical cables typically comprise a semiconductive polymer composite layer to homogenize the electromagnetic field through the cables. The semiconductive layers usually contain a high content of carbon black (CB) for reduced electrical resistivity. In this study, we found that both the morphology and resistivity of a ternary polymer composite of CB/low density polyethylene (LDPE)/ethylene-vinyl acetate (EVA) depend on CBs used and the order of addition. Three types of CB were investigated. CB-A, which has the lowest surface energy and the most uniform surface energy profile, exhibits a strong affinity to LDPE and always segregates in the LDPE phase whether it is first added in the LDPE phase or the EVA phase. CB-B and CB-C, which have higher and less homogeneous surface energies, distribute differently with different orders of addition. We observe a significant reduction in the percolation threshold of CB-A in the CB/LDPE/EVA composite, but not with CB-B or CB-C. Adding CB-A in the LDPE phase first results in substantially lower resistivity than adding it in the EVA phase first, whereas adding CB-B or CB-C in the LDPE phase first results in higher resistivity than adding them in the EVA phase first.
机译：中高压至超高压电缆通常包括一层半导体聚合物复合层，以均匀通过电缆的电磁场。半导体层通常含有高含量的炭黑（CB），以降低电阻率。在本研究中，我们发现CB/低密度聚乙烯（LDPE）/乙烯-醋酸乙烯酯（EVA）三元聚合物复合材料的形态和电阻率取决于所用的CB和添加顺序。研究了三种类型的CB。CB-A具有最低的表面能和最均匀的表面能分布，与LDPE表现出很强的亲和力，并且无论是首先添加到LDPE相还是EVA相，它总是在LDPE相分离。CB-B和CB-C具有较高和较低的均匀表面能，它们在不同的添加顺序下分布不同。我们观察到CB-a在CB/LDPE/EVA复合材料中的渗透阈值显著降低，但在CB-B或CB-C中没有。在LDPE相中添加CB-a首先会导致比在EVA相中添加CB-a更低的电阻率，而在LDPE相中添加CB-B或CB-C首先会导致比在EVA相中添加CB-B或CB-C更高的电阻率。

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