弹性体类型对高压电缆聚丙烯绝缘材料电气机械性能的影响及机理,Journal of Applied Polymer Science

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弹性体类型对高压电缆聚丙烯绝缘材料电气机械性能的影响及机理
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-12-10 , DOI: 10.1002/app.55026
Xuejing Li ₁ , Xiaolong Chen ₁ , Lu Liu ₁ , Yanhui Wei ₁ , Chuncheng Hao ₁ , Shengtao Li ₂ , Guochang Li ₁

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聚丙烯（PP）以其优异的耐热性、电性能和可降解性成为新型环保电缆主绝缘的优越候选材料。但在实际应用中，PP材料容易老化、脆弱，韧性较差。PP材料的力学性能可以通过弹性体改性来提高，但不同弹性体对复合材料试件综合性能的影响存在较大差异。本文通过实验和分子模拟（MS）相结合的方法对不同类型弹性体改性PP复合材料的电学和机械性能进行了比较和分析。实验结果表明，SEBS/PP复合材料是各类复合材料中陷阱能级最低的，其空间电荷累积量为1.96×10 ^-9 C，复合材料的力学和流变性能改善最为显着。。同时，体积电阻率比纯PP降低了两个数量级。但改性后各类复合材料的击穿强度均出现不同程度的下降。通过分子模拟进一步研究了溶解度参数（δ ）和自由体积，结果表明SEBS的δ与PP相似，代表了最好的相容性。而且SEBS/PP复合材料具有最强的分子间作用力和对PP最优异的韧性提升。该工作为PP改性中弹性体的选择提供了理论依据。

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The influence and mechanism of elastomer types on electrical and mechanical properties of polypropylene insulation materials for high voltage cables

Polypropylene (PP) becomes a superior candidate material for new environmentally friendly cable main insulation with its excellent heat resistance, electrical properties, and degradability. However, in practical application, PP material is aging and vulnerable and its toughness is poor. The mechanical properties of PP material can be improved by elastomer modification, but the effects of different elastomers on the comprehensive properties of composite specimens are quite different. In this paper, the electrical and mechanical properties of different types of elastomer-modified PP composites are compared and analyzed by combining experimental and molecular simulation (MS) methods. The experimental results show that the SEBS/PP composite material has the lowest trap energy levels among all kinds of composite materials, its space charge accumulation is 1.96 × 10⁻⁹C, and the mechanical and rheological properties improvement of the composite is the most remarkable. Meanwhile, the volume resistivity is reduced by two orders of magnitude compared with pure PP. However, the breakdown strength of all kinds of composite materials decreases by different degrees after the modification. The solubility parameters (δ) and the free volume are further investigated by the molecular simulation, which shows that the δ of SEBS is similar to that of PP, which represents the best compatibility. Moreover, the SEBS/PP composite material has the strongest inter-molecular force and the most excellent toughness improvement for PP. This work provides a theoretical basis for elastomer selection in PP modification.

更新日期：2023-12-10

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