Achieving synergistic improvement in dielectric constant and energy storage properties of all-organic liquid crystal molecule/PVDF composites
It is an urgent issue to enhance the energy storage capacity of dielectric film capacitors for their miniaturization and integration into lightweight electronic devices under the premise of large-scale industrial production. In this work, via selecting a low-cost liquid crystal small molecule (4-cya...
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Published in | Journal of materials chemistry. C, Materials for optical and electronic devices Vol. 1; no. 46; pp. 17757 - 17767 |
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Main Authors | , , , , , , |
Format | Journal Article |
Language | English |
Published |
Cambridge
Royal Society of Chemistry
01.12.2022
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Subjects | |
Online Access | Get full text |
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Summary: | It is an urgent issue to enhance the energy storage capacity of dielectric film capacitors for their miniaturization and integration into lightweight electronic devices under the premise of large-scale industrial production. In this work,
via
selecting a low-cost liquid crystal small molecule (4-cyano-4′-pentylbiphenyl, denoted as 5CB) as the organic filler, a series of all-organic poly(vinylidene fluoride)-based (PVDF) composite films are prepared through a simple solvent casting method. The 5CB organic filler with high liquid mobility and strong polarity can mix and interact well with the PVDF matrix, thus forming dense and high-quality dielectric polymer films. As a result, the 5 wt% 5CB/PVDF composite exhibits the highest dielectric constant of 9.8 at 1 kHz because of its great dispersibility and strong interfacial polarization. More importantly, a maximum discharge energy density of 11.7 J cm
−3
is obtained due to the increased crystallinity, the formation of charge traps and enhanced mechanical properties, which is more than 3 times that of a pristine PVDF film (3.8 J cm
−3
). This work is viable for large-scale preparation of high performance flexible dielectric composites
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a simple and inexpensive method.
Liquid crystalline molecule fillers can simultaneously improve the dielectric constant and breakdown strength of a PVDF matrix. |
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Bibliography: | P https://doi.org/10.1039/d2tc03556a E Electronic supplementary information (ESI) available: Details of characterization, the DMF contact angle, dielectric constant at 1 KHz and 150 °C - loops at the highest electric field, the leakage current density, summary table about physical properties, and the LUMO, HOMO and energy gap values of PVDF and 5CB. See DOI |
ISSN: | 2050-7526 2050-7534 |
DOI: | 10.1039/d2tc03556a |