Improved Breakdown Strength and Energy Density in Thin-Film Polyimide Nanocomposites with Small Barium Strontium Titanate Nanocrystal Fillers

被引：63

作者：

Beier, Christopher W. ^{[1
]}

Sanders, Jason M. ^{[2
]}

Brutchey, Richard L. ^{[1
]}

机构：

[1] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA

[2] Univ So Calif, Ming Hsieh Dept Elect Engn, Los Angeles, CA 90089 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY C | 2013年 / 117卷 / 14期

关键词：

LOW-TEMPERATURE SYNTHESIS; DIELECTRIC-PROPERTIES; SURFACE MODIFICATION; GRAIN-SIZE; BATIO3; NANOPARTICLES; BEHAVIOR; COMPOSITES; MIXTURE; PMDA;

D O I：

10.1021/jp312519r

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Improved dielectric constant, breakdown strength, and energy density are reported for polyimide/sub-10 nm Ba0.7Sr0.3TiO3 (BST) nanocomposites up to the percolation threshold. Homogeneous nanocomposites were prepared via an in situ polymerization technique, whereby a suspension of BST is blended with 1,3-bis(4-aminophenoxy)benzene (BAPB) and pyromellitic dianhydride (PMDA) monomers prior to spin-casting and thermal imidization. The dielectric properties the PMDA-BAPB/BST nanocomposites were measured as a function of BST loading and displayed a 24% increase in breakdown strength and calculated energy densities more than twice that of the pure polymer at 10 vol % BST. The PMDA-BAPB/BST nanocomposites also display improved permittivities (er = 6.2 at 18 vol % and 1 MHz) and low dielectric loss (tan delta <0.04 for all loadings up to 1 MHz) and are thermally stable above 450 degrees C in air and 500 degrees C in nitrogen. The results highlight the benefit of employing extremely small and highly dispersed nanocrystals in capacitive energy storage applications.

引用

页码：6958 / 6965

页数：8

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