具有更好热稳定性和绝缘性能的聚酰亚胺改性纤维素绝缘纸

IF 2.9 3区 工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC
Wenchang Wei;Yiyi Zhang;Haiqiang Chen;Chuqi Xu;Shuangxi Nie;Junwei Zha
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引用次数: 0

摘要

随着电压等级的不断提高,人们迫切需要具有优异电气绝缘强度和更高热稳定性的新型绝缘纸,以适应高压电力变压器的变革性发展。然而,传统的 "试错 "方法在快速开发替代材料方面遇到了巨大挑战。因此,我们通过分子动力学(MD)模拟预测了聚酰亚胺(PI)/纤维素绝缘纸的机械、热稳定性和介电属性。随后,我们制作了不同聚酰亚胺纤维含量的复合绝缘纸,并对其热稳定性和电气特性进行了全面研究。与纯纤维素绝缘纸相比,6% PI/纤维素复合材料(P6)最具代表性,其抗张强度显著提高了 26.24%,玻璃化转变温度从 113.4 K 上升到 124.7 K,介电常数从 4.22 降低到 3.25,介电损耗大幅降低了 58.33%,击穿强度提高了 30.35%。这项研究明确证实了 MD 模拟在加速绝缘材料开发方面的功效,并将 PI/纤维素绝缘纸确立为高压变压器的前沿替代品,开创了绝缘材料的新时代。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Polyimide-Modified Cellulose Insulating Paper With Improved Thermal Stability and Insulation Properties
As the voltage level continues to rise, an imperative demand arises for novel insulating papers characterized by superior electrical insulation strength and heightened thermal stability, to align with the transformative advancements in high-voltage power transformers. Nevertheless, conventional approaches relying on “trial-and-error” approaches encounter significant challenges in expeditiously developing alternative materials. Therefore, the mechanical, thermal stability and dielectric attributes of polyimide (PI)/cellulose insulating paper have been predicted through molecular dynamics (MD) simulations. Subsequently, insulating papers of the composite variety, featuring varying PI fiber content, have been fabricated and subjected to comprehensive investigations of their thermal stability and electrical characteristics. In comparison to pure cellulose insulating paper, the 6% PI/cellulose composite proves (P6) to be the most representative, exhibiting a notable 26.24% increase in tensile strength, a rise in glass transition temperature from 113.4 to 124.7 K, a reduction in permittivity from 4.22 to 3.25, a substantial 58.33% decrease in dielectric loss, and a 30.35% enhancement in breakdown strength. This study unequivocally confirms the efficacy of MD simulations in expediting the development of insulating material and establishes PI/cellulose insulating paper as an avant-garde alternative for high-voltage transformers, ushering in a new era for insulation materials.
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来源期刊
IEEE Transactions on Dielectrics and Electrical Insulation
IEEE Transactions on Dielectrics and Electrical Insulation 工程技术-工程:电子与电气
CiteScore
6.00
自引率
22.60%
发文量
309
审稿时长
5.2 months
期刊介绍: Topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use.
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