Tailoring the dipole properties in dielectric polymers to realize high energy density with high breakdown strength and low dielectric loss

High energy density polymer materials are desirable for a broad range of modern power electronic systems. Here, we report the development of a new class of polymer dielectrics based on polyurea and polythiourea, which possess high thermal stability. By increasing the dipole density, the dielectric c...

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Bibliographic Details
Published in:Journal of applied physics 2015-03, Vol.117 (11)
Main Authors: Thakur, Yash, Lin, Minren, Wu, Shan, Cheng, Zhaoxi, Jeong, D.-Y., Zhang, Q. M.
Format: Article
Language:English
Subjects:
Applied physics
CHARGE CARRIERS
CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
COMPARATIVE EVALUATIONS
Current carriers
Dielectric breakdown
Dielectric loss
DIELECTRIC MATERIALS
Dielectric properties
Dielectric strength
DIPOLE MOMENTS
DIPOLES
ELECTRIC FIELDS
Electronic systems
ENERGY DENSITY
Flux density
MATERIALS SCIENCE
ORGANIC POLYMERS
PERMITTIVITY
PHASE STABILITY
Polymers
RELAXATION LOSSES
Thermal stability
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Summary:High energy density polymer materials are desirable for a broad range of modern power electronic systems. Here, we report the development of a new class of polymer dielectrics based on polyurea and polythiourea, which possess high thermal stability. By increasing the dipole density, the dielectric constant of meta-phenylene polyurea and methylene polythiourea can be increased to 5.7, compared with aromatic polyurea and aromatic polythiourea, which have a dielectric constant in the range of 4.1–4.3. The random dipoles with high dipolar moment and amorphous structure of these polyurea and polythiourea based polymers provide strong scattering to the charge carriers, resulting in low losses even at high electric fields. Consequently, this new class of polymers exhibit a linear dielectric response to the highest field measured (>700 MV/m) with a high breakdown strength, achieving high energy density (>13 J/cm3) with high efficiency (>90%).
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4915942