NDLI: Fabrication and origin of asymmetric polyvinylidene fluoride-carbon nanotube/cyanate ester materials with high dielectric constant and low dielectric loss through building double-layered structure

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Fabrication and origin of asymmetric polyvinylidene fluoride-carbon nanotube/cyanate ester materials with high dielectric constant and low dielectric loss through building double-layered structure

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Fabrication and origin of asymmetric polyvinylidene fluoride-carbon nanotube/cyanate ester materials with high dielectric constant and low dielectric loss through building double-layered structure

Content Provider	IET Digital Library
Author	Zheng, Longhui Yuan, Li Guan, Qingbao Gu, Aijuan Liang, Guozheng
Abstract	High dielectric loss has been the biggest sticky problem for high-k conductor/polymer composites. Herein, a new asymmetric material consisting of one layer of β-phase poly(vinylidene fluoride) (PVDF) and another layer of carboxylated carbon nanotube (eCNT)/cyanate ester (CE) composite was fabricated, coded as PVDFx–eCNTq/CE, where x is the thickness of PVDF layer ranging from 3 to 70 μm, q is the loading of eCNTs (f), taking values of 1.2 and 1.7 wt%. The influences of f and x values on dielectric properties and breakdown strengths of PVDF–eCNT/CE materials were systematically studied. When f is smaller than the percolation threshold (fc ) of eCNT/CE (fc = 1.6 wt%), the corresponding PVDF–eCNT1.2/CE materials have similar conductive and dielectric properties as eCNT1.2/CE composite. When f > fc , all PVDF–eCNT1.7/CE materials have much lower dielectric loss than eCNT1.7/CE, while with suitable thickness of PVDF layer (<70 μm), PVDF–eCNT/CE materials have significantly improved dielectric constants and breakdown strengths. For the PVDF–eCNT1.7/CE material of which the thickness of PVDF layer is 5 μm, its dielectric constant at 1 Hz is 1699, about ten times of that of eCNT1.7/CE, while the dielectric loss is only 2.31 × 10−2 times of that of the latter. The origin behind was intensively studied in terms of space charge distribution.
Starting Page	32
Ending Page	38
Page Count	7
Volume Number	2
e-ISSN	23977264
Issue Number	Issue 1, Mar (2017)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/hve/2/1
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/hve.2016.0064
Journal	High Voltage
Publisher	The Institution of Engineering and Technology CEPRI
Publisher Date	2017-03-01
Access Restriction	Open
Rights License	Creative Commons Attribution -Non Commercial License (http://creativecommons.org/licenses/by-nc/3.0/)
Subject Keyword	Asymmetric Epoxidised Composite Breakdown Strength Carbon Nanotubes Conductive Property Dielectric Breakdown And Space-charge Effects Dielectric Constant Dielectric Loss Dielectric Loss And Relaxation Dielectric Permittivity Double-layered Structure Electric Breakdown Material Preparation Nanocomposite Photonic Technology Polymer Polymer-based CompoSite Polyvinylidene Fluoride-carbon Nanotube-cyanate Ester Composite Preparation of Reinforced Polymers Space Charge Space Charge Distribution
Content Type	Text
Resource Type	Article

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