电压稳定剂对PP/弹性体共混物直流击穿强度影响

Influence of Voltage Stabilizer on the DC Breakdown Strength of PP/Elastomer Blends

弹性体聚合物可以用于改善聚丙烯(PP)绝缘材料的韧性,但会对材料原有的耐电性能产生影响;电压稳定剂常用于改善交联聚乙烯电缆绝缘的耐电性能,但能否在PP基绝缘材料中发挥作用尚不明确。研究两种弹性体聚合物(POE、SEBS)对PP力学性能和直流击穿性能的影响,选出改善PP力学性能的较优组分;之后分别研究电压稳定剂对PP、弹性体及其两者共混物直流击穿强度的影响。结果表明,POE和SEBS两种弹性体可增韧PP,但随着其添加量增加,PP直流击穿强度下降。三种电压稳定剂均能提高纯PP的直流耐电性能,其中添加0.4phr的AOHBP提高比例最高,其值为34.6%。然而,三种电压稳定剂均不能提高弹性体以及PP/弹性体共混绝缘材料的直流击穿场强,电压稳定剂作用效果受聚合物基体的影响较大。

Elastomer polymer can be used to improve the toughness of polypropylene(PP) insulation material, but it may weaken the electrical properties of PP. Voltage stabilizer has been used to improve the electrical properties of XLPE, but it is not clear whether it can play a role in PP based insulation materials. The effects of two elastomer polymers(POE and SEBS) on the mechanical and DC breakdown properties of PP are studied. The influence of voltage stabilizer on DC breakdown strength is investigated with the optimal components, which are selected by the mechanical properties. The results show that POE and SEBS can toughen PP, but the DC breakdown strength of the composites decreases with the increase of POE and SEBS. All the three voltage stabilizers can improve the electrical properties of pure PP, especially the AOHBP realized an increment of 34.6% when 0.4 phr is doped. However, none of the three voltage stabilizers can improve the DC breakdown strength of elastomers or PP/elastomer blends, and the effect of voltage stabilizers is significantly affected by the polymer matrix.