Enhanced dielectric properties of amino-modified-CNT/polyimide composite films with a sandwich structure
Novel amino-modified-CNT/polyimide (NH sub(2)-MWNT/PI) flexile composite films with a sandwich structure were prepared through step-by-step casting, in which a dielectric layer (NH sub(2)-MWNT/PI composites) intercalated between the two insulating layers (pure PI, acting as both the bottom and the t...
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Published in | Journal of materials chemistry. A, Materials for energy and sustainability Vol. 2; no. 34; pp. 14118 - 14126 |
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Main Authors | , , , , , , , |
Format | Journal Article |
Language | English |
Published |
01.08.2014
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Subjects | |
Online Access | Get full text |
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Summary: | Novel amino-modified-CNT/polyimide (NH sub(2)-MWNT/PI) flexile composite films with a sandwich structure were prepared through step-by-step casting, in which a dielectric layer (NH sub(2)-MWNT/PI composites) intercalated between the two insulating layers (pure PI, acting as both the bottom and the top layers). Due to the high capacitance of the dielectric layer and the effective blocking off conductive paths by the insulating layers, the sandwich composite films show a high dielectric constant and ultralow dielectric loss, and the dielectric constants of the composite films are almost frequency independent between 1 and 1000 kHz. It is notable that the NH sub(2)-MWNT/PI ratio of the mid-layer markedly influences the dielectric property of the composite film. When the NH sub(2)-MWNT content of the mid-layer is 10 wt%, the multi-layer composite film (P-10-P) shows the highest dielectric constant ( epsilon ') of 31.3 at 1 kHz, while the dielectric loss (tan delta ) of the P-10-P is only 0.0016. Furthermore, the obtained multi-layer composite films have high breakdown strength and maximum energy storage density. The mechanical properties and thermal properties of the composite films were also examined in this work. |
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Bibliography: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
ISSN: | 2050-7488 2050-7496 |
DOI: | 10.1039/c4ta01818d |