Significant enhancement of dielectric properties in polyimides with sulfonyl groups in the side chains

IF 3.8 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC IET Nanodielectrics Pub Date : 2023-08-09 DOI:10.1049/nde2.12062
Jinpeng Luo, Hui Tong, Shimo Cao, Junbiao Liu, Xiaomin Li
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Abstract

Polymer dielectrics with excellent thermal resistance and superior energy storage behaviour are extensively demanded with the increasing development of film capacitors applied in hostile environments. In this study, novel diamine with sulfonyl-containing side chain was designed and synthesised. The corresponding polyimide (PI) dielectrics derived from the sulfonyl-containing diamine were prepared, so were the polyimides possessing the same backbone but without side chains. Consequently, superior thermal resistance of glass transition temperature ranged from 162–208°C was obtained. Moreover, the polyimides presented permittivity of 3.34–5.89 at 1 kHz, Weibull breakdown strength of 377–538 MV/m and discharged energy density of 3.82–5.85 J/cm3. In particular, sulfonyl-containing polyimide of SPI-2 with flexible backbone and sulfonyl side chain indicates the highest discharged energy density and charge-discharge efficiency simultaneously. The introduction of the strong polar sulfonyl group in the side chain enhances dielectric and energy storage properties effectively. In addition, it is found that the dipolar moment density (μ/Vvdw) calculated from molecular simulation is closely correlated to permittivity measured from experiments. The combined method of molecular simulation and experiments would offer an effective approach to assist in molecular design of high-performance polymer dielectrics.

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侧链带有磺酰基的聚酰亚胺的介电性能显著提高
随着应用于恶劣环境中的薄膜电容器的不断发展,人们对具有优异热阻和优异储能性能的聚合物电介质提出了广泛的要求。在本研究中,设计并合成了具有磺酰基侧链的新型二胺。制备了由含磺酰基二胺衍生的相应聚酰亚胺(PI)电介质,也制备了具有相同主链但没有侧链的聚酰亚胺。因此,在162–208°C的玻璃化转变温度范围内获得了优异的耐热性。此外,聚酰亚胺在1 kHz下的介电常数为3.34–5.89,威布尔击穿强度为377–538 MV/m,放电能量密度为3.82–5.85 J/cm3。特别是,具有柔性主链和磺酰基侧链的SPI‐2的含磺酰基聚酰亚胺同时显示出最高的放电能量密度和充放电效率。侧链中强极性磺酰基的引入有效地提高了介电和储能性能。此外,还发现分子模拟计算的偶极矩密度(μ/Vvdw)与实验测量的介电常数密切相关。分子模拟和实验相结合的方法将为高性能聚合物电介质的分子设计提供一种有效的方法。
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麦克林 N, N -dimethylformamide
麦克林 ethanol
麦克林 pyromellitic dianhydride
来源期刊
IET Nanodielectrics
IET Nanodielectrics Materials Science-Materials Chemistry
CiteScore
5.60
自引率
3.70%
发文量
7
审稿时长
21 weeks
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