构建含有双极悬挂组的新型高介电常数聚合物,具有增强的定向极化
Yadong Tang1, Wenhan Xu2, Hongyan Yao1
1College of Chemistry, Jilin University, Changchun, Jilin, 130012, China.
Macromolecular rapid communications
|January 15, 2024
概括
带有尿素侧链的新型聚合物提供了高介电常数和低损耗的储能. 与硫基聚合物相比,这些材料表现出优越的性能,使先进的电气应用成为可能.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 介电材料 介电材料
背景情况:
- 高介电常数聚合物对于电力和脉冲动力应用至关重要.
- 设计具有二极侧链的聚合物增强介电性质并减少损耗.
- 为了比较,合成了含有尿素,碳酸盐和硫基的新型聚合物.
研究的目的:
- 合成和比较新型聚胺的介电性质与尿素,碳酸盐和硫酸侧链.
- 研究侧链结构与介电性能之间的关系.
- 评估这些聚合物在储能应用中的潜力.
主要方法:
- 新型聚胺与尿素 (BU-PI),碳酸盐 (BC-PI) 和硫 (BS-PI) 功能组的合成.
- 使用介电光谱学进行全面的介电性质表征.
- 评估储能性能,包括放电能量密度和充放电效率.
主要成果:
- 双极侧链的聚化物表现出高介电常数和低介电损失.
- 含有尿素悬挂组的BU-PI显示了最高的介电常数 (6.14) 和低的介电损耗 (0.0097).
- 介电光谱学揭示了强大的 γ 过渡,并增强了尿素二极体的自由旋转运动.
- 在500 MV m-1时,BU-PI实现了6.92 J cm-3的放电能量密度和>83%的效率.
结论:
- 与硫基相比,尿素悬挂组在聚胺中提供了优越的介电性质.
- 增强的方向偏振和抑制的二极极相互作用有助于提高介电性能.
- 这些新型聚胺,特别是BU-PI,对先进的储能和电气应用具有前景.
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