Preparation and dielectric properties of polyimide-based composites with Al-Nb co-doped SiO2

IF 1.8 4区化学 Q3 POLYMER SCIENCE

High Performance Polymers Pub Date : 2023-12-23 DOI:10.1177/09540083231224158

Wenchao Zhang, Qiang Fu, Qixin Yuan, Han Li, Dong Yue, Yu Feng, Qingguo Chen, Jinghua Yin

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引用次数: 0

Abstract

Polyimide (PI) film have been synthesized and used extensively in energy transmission, wind power generation, new energy vehicles, lidar, and high-power weapons, et al. Nevertheless, it is still challenge to further improve the breakdown strength and dielectric constant of PI film. After the powders of Al0.5xNb0.5xSi1-xO2 (NASO (x mol%)) have been fabricated, it was analyzed that the effect of doping elements Al3+ and Nb5+ on the surface chemistry and microstructure of the NASO powder. And then a small amount of NASO powder was polymerized in situ with PI matrix material, and the effects of NASO on dielectric properties and breakdown strength of the NASO/PI composites were analyzed. The results showed that the introduction of the doping elements Al3+ and Nb5+ favors could be conductive to the formation of oxygen vacancies on the surface of the NASO particle, which improved the surface activity and chemical reactivity of the NASO particle. The PI matrix can efficiently capture additional charges and enhance the insulating characteristics of the NASO/PI composite by properly doping NASO fillers with specific defect concentrations. In the results the breakdown strength of 1 vol% NASO (1 mol%)/PI composites reaches 334.38 kV/mm, which is a 19.6% higher than that of PI. Because the traps in the fillers capture and suppress the carrier transport to enhance the insulating properties of the composites. This work offers a novel synthesis method to simultaneously produce polymer dielectrics with high insulation and high polarization.

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Al-Nb 共掺杂 SiO2 的聚酰亚胺基复合材料的制备与介电特性

聚酰亚胺（PI）薄膜已被合成并广泛应用于能源传输、风力发电、新能源汽车、激光雷达和大功率武器等领域。然而，如何进一步提高 PI 薄膜的击穿强度和介电常数仍是一个挑战。在制备出 Al0.5xNb0.5xSi1-xO2（NASO（x mol%））粉末后，分析了掺杂元素 Al3+ 和 Nb5+ 对 NASO 粉末表面化学和微观结构的影响。然后将少量 NASO 粉末与 PI 基体材料原位聚合，分析了 NASO 对 NASO/PI 复合材料介电性能和击穿强度的影响。结果表明，掺杂元素 Al3+ 和 Nb5+ 的引入有利于在 NASO 颗粒表面形成氧空位，从而提高了 NASO 颗粒的表面活性和化学反应活性。通过适当掺杂特定缺陷浓度的 NASO 填料，PI 基体可有效捕获额外电荷，增强 NASO/PI 复合材料的绝缘特性。结果表明，1 vol% NASO (1 mol%) /PI 复合材料的击穿强度达到 334.38 kV/mm，比 PI 高出 19.6%。这是因为填料中的陷阱捕获并抑制了载流子的传输，从而增强了复合材料的绝缘性能。这项研究提供了一种新的合成方法，可同时生产出高绝缘性和高极化的聚合物电介质。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

High Performance Polymers 化学-高分子科学

CiteScore

4.20

自引率

14.30%

发文量

106

审稿时长

1.2 months

期刊介绍： Health Services Management Research (HSMR) is an authoritative international peer-reviewed journal which publishes theoretically and empirically rigorous research on questions of enduring interest to health-care organizations and systems throughout the world. Examining the real issues confronting health services management, it provides an independent view and cutting edge evidence-based research to guide policy-making and management decision-making. HSMR aims to be a forum serving an international community of academics and researchers on the one hand and healthcare managers, executives, policymakers and clinicians and all health professionals on the other. HSMR wants to make a substantial contribution to both research and managerial practice, with particular emphasis placed on publishing studies which offer actionable findings and on promoting knowledge mobilisation toward theoretical advances. All papers are expected to be of interest and relevance to an international audience. HSMR aims at enhance communication between academics and practitioners concerned with developing, implementing, and analysing health management issues, reforms and innovations primarily in European health systems and in all countries with developed health systems. Papers can report research undertaken in a single country, but they need to locate and explain their findings in an international context, and in international literature.