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How to install TEMPO in dielectric polymers—Their rational design toward energy-storable materials

How to install TEMPO in dielectric polymers—Their rational design toward energy-storable materials
How to install TEMPO in dielectric polymers—Their rational design toward energy-storable materials
Polar groups and the charge‐transport capability play significant roles in the dielectric properties of organic polymers, and thus influence the electric energy density upon application as a capacitor material. Here, the dielectric properties and electric conductivity of a series of polymers containing 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) radicals are investigated. The neat radical polymer poly(TEMPO methacrylate) (PTMA) has a high dielectric constant but poor breakdown strength. Poly(methyl methacrylate) (PMMA) is introduced as an insulating polymer with high resistivity on breakdown, along with molecular design of PTMA. Copolymers of TEMPO methacrylate and methyl methacrylate, P(TMA‐r‐MMA), exhibit high breakdown strengths but low dielectric constants. PMMA blended with TEMPO exhibits the highest electric energy density of 7.4 J cm−3 (that of PTMA is 0.48 J cm−3 as a control), with both a high dielectric constant (≈6.8) and a high breakdown strength (≈500 MV m−1). It benefits from long‐range but not bulk charge transport in the blends, which is different from the bulk charge transport in PTMA and the short‐range charge transport in P(TMA‐r‐MMA). These results indicate that the TEMPO moiety located in the high breakdown matrix leads to a high energy‐storage density in the capacitor.
TEMPO, Dielectric Polymers, Energy Storage
1022-1336
1 - 6
Feng, Yang
2c7c408e-57f8-414f-93df-786b610adf79
Suga, Takeo
b9916ece-3bea-4a56-8f48-bff663cd2137
Nishide, Hiroyuki
0dec5b73-9d14-44d2-8941-2832a47752c9
Ohki, Yoshimichi
aa08076b-6d2e-4fcc-a185-169339d059b6
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, Shengtao
fce63d66-2e99-4dc5-b715-250d2dc8b25e
Feng, Yang
2c7c408e-57f8-414f-93df-786b610adf79
Suga, Takeo
b9916ece-3bea-4a56-8f48-bff663cd2137
Nishide, Hiroyuki
0dec5b73-9d14-44d2-8941-2832a47752c9
Ohki, Yoshimichi
aa08076b-6d2e-4fcc-a185-169339d059b6
Chen, George
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Li, Shengtao
fce63d66-2e99-4dc5-b715-250d2dc8b25e

Feng, Yang, Suga, Takeo, Nishide, Hiroyuki, Ohki, Yoshimichi, Chen, George and Li, Shengtao (2019) How to install TEMPO in dielectric polymers—Their rational design toward energy-storable materials. Macromolecular Rapid Communications, 40 (4), 1 - 6, [1800734]. (doi:10.1002/marc.201800734).

Record type: Article

Abstract

Polar groups and the charge‐transport capability play significant roles in the dielectric properties of organic polymers, and thus influence the electric energy density upon application as a capacitor material. Here, the dielectric properties and electric conductivity of a series of polymers containing 2,2,6,6‐tetramethylpiperidine‐1‐oxyl (TEMPO) radicals are investigated. The neat radical polymer poly(TEMPO methacrylate) (PTMA) has a high dielectric constant but poor breakdown strength. Poly(methyl methacrylate) (PMMA) is introduced as an insulating polymer with high resistivity on breakdown, along with molecular design of PTMA. Copolymers of TEMPO methacrylate and methyl methacrylate, P(TMA‐r‐MMA), exhibit high breakdown strengths but low dielectric constants. PMMA blended with TEMPO exhibits the highest electric energy density of 7.4 J cm−3 (that of PTMA is 0.48 J cm−3 as a control), with both a high dielectric constant (≈6.8) and a high breakdown strength (≈500 MV m−1). It benefits from long‐range but not bulk charge transport in the blends, which is different from the bulk charge transport in PTMA and the short‐range charge transport in P(TMA‐r‐MMA). These results indicate that the TEMPO moiety located in the high breakdown matrix leads to a high energy‐storage density in the capacitor.

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More information

Accepted/In Press date: 14 November 2018
e-pub ahead of print date: 26 November 2018
Published date: February 2019
Keywords: TEMPO, Dielectric Polymers, Energy Storage

Identifiers

Local EPrints ID: 428587
URI: http://eprints.soton.ac.uk/id/eprint/428587
ISSN: 1022-1336
PURE UUID: d17d4952-e518-4aa8-95e5-be248c4bca9d

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Date deposited: 01 Mar 2019 17:30
Last modified: 01 Mar 2019 17:30

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Contributors

Author: Yang Feng
Author: Takeo Suga
Author: Hiroyuki Nishide
Author: Yoshimichi Ohki
Author: George Chen
Author: Shengtao Li

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