All organic polyimide-based composite films with high intrinsic polarization for superior energy density and low dielectric loss,Journal of Applied Polymer Science

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All organic polyimide-based composite films with high intrinsic polarization for superior energy density and low dielectric loss
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2023-05-04 , DOI: 10.1002/app.54043
Yu Wang ₁ , Wenlong Yang ₂ , Jiaqi Lin _{3,

4} , Xinmei Liu ₅ , Yuhang Zuo ₅ , Hongguo Sun ₆ , Ying Yang ₇ , Xunjun He ₁

Affiliation

A simple and low-cost approach was proposed to fabricate poly(vinylidene fluoride) (PVDF) and polyimide-poly(amidic acid) (PI-PAA) all-organic hybrid films with excellent dielectric performance by solution casting and thermal imidization process. The results showed that the introduction of PVDF and PAA molecular chains into PI matrix significantly enhanced the dielectric permittivity and energy density of PI-based composites. The permittivity and energy density of 15 wt% PI-PAA/PVDF composites were 4.83 at 10³ Hz and 5.55 J cm⁻³, which were 52% and 107% higher than that of PI (3.18 at 10³ Hz, 2.68 J cm⁻³). In addition, the dielectric loss of 15 wt% PI-PAA/PVDF composites was still maintained at a low level (0.009 at 10³ Hz). The molecular dynamics results showed that the polarization strength of composites mainly originated from the intrinsic polarization strength. The intrinsic polarization strength of PI-PAA/PVDF in the composites was 10¹⁰ times higher than interfacial polarization strength, and interfacial polarization was negligible. There was no significant difference between the self-diffusion coefficients of 15 wt% PI-PAA/PVDF and PI-PAA, indicating that the relaxation polarization of polymer molecular chains was suppressed. This work provides an effective way for the preparation of dielectric for all organic high voltage direct current system.

中文翻译：

全有机聚酰亚胺基复合薄膜，具有高本征极化，具有出色的能量密度和低介电损耗

提出了一种简单且低成本的方法，通过溶液流延和热亚胺化工艺制备具有优异介电性能的聚偏二氟乙烯 (PVDF) 和聚酰亚胺-聚酰胺酸 (PI-PAA) 全有机杂化薄膜。结果表明，在PI基体中引入PVDF和PAA分子链显着提高了PI基复合材料的介电常数和能量密度。15 wt% PI-PAA/PVDF 复合材料的介电常数和能量密度在 10 ³ Hz 和 5.55 J cm ^{-3 时}分别为 4.83，分别比 PI（3.18 在 10 ³ Hz，2.68 J cm ^-3）。此外，15 wt% PI-PAA/PVDF 复合材料的介电损耗仍保持在较低水平（0.009 在 10 ³ 赫兹）。分子动力学结果表明，复合材料的极化强度主要来源于本征极化强度。复合材料中PI-PAA/PVDF的本征极化强度是界面极化强度的10 ¹⁰倍，界面极化可忽略不计。15 wt% PI-PAA/PVDF 与 PI-PAA 的自扩散系数无显着差异，表明聚合物分子链的弛豫极化受到抑制。该工作为全有机高压直流系统电介质的制备提供了一种有效途径。

更新日期：2023-05-04

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