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All organic polyimide‐based composite films with high intrinsic polarization for superior energy density and low dielectric loss.

Authors :
Wang, Yu
Yang, Wenlong
Lin, Jiaqi
Liu, Xinmei
Zuo, Yuhang
Sun, Hongguo
Yang, Ying
He, Xunjun
Source :
Journal of Applied Polymer Science; 7/10/2023, Vol. 140 Issue 26, p1-10, 10p
Publication Year :
2023

Abstract

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
00218995
Volume :
140
Issue :
26
Database :
Complementary Index
Journal :
Journal of Applied Polymer Science
Publication Type :
Academic Journal
Accession number :
164059113
Full Text :
https://doi.org/10.1002/app.54043