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Tuning conformational H‑bonding arrays in aromatic/alicyclic polythiourea toward high energy-storable dielectric material

Tuning conformational H‑bonding arrays in aromatic/alicyclic polythiourea toward high energy-storable dielectric material
Tuning conformational H‑bonding arrays in aromatic/alicyclic polythiourea toward high energy-storable dielectric material
Polythioureas (PTUs) have been investigated as a dielectric material for an energy-storable capacitor in both experimental and computational approaches. However, the effect of dipolar polarization, closely associated with conformational H-bonding arrays, on dielectric properties under the operating frequency has never been studied in PTUs. Here, a series of PTUs with different spacers and additional dipoles are synthesized to explore the influence of
conformations in thiourea units on their dielectric properties. The additional dipolar substituent (−COOH) contributes to a high dielectric constant, while accompanying a remarkable dielectric loss. Alternatively, a random copolymer is prepared to adjust the −COOH content, which displays a high dielectric constant and a suppressed dielectric loss. However, it requires strict control of the segmental ratio to meet the energy-storage demand. A neat alicyclic PTU with a flexible cyclohexyl spacer also exhibited a high dielectric constant and a low dielectric loss because of its rich trans/trans conformation, which brings about an increasing effective dipole moment per unit volume. Meanwhile, it retains high breakdown strength, thus leading to high electric energy density (Ue ≈ 10 J/cm3). These results suggest that tuning conformational H-bonding arrays based on molecular design is a more effective way to improve the dielectric properties of PTUs toward a very high energy storable material.
8781-8787
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Feng, Yang
f8fa5f60-405c-43d2-80a1-c5bb9ddd9b50
Hasegawa, Yui
82cba96b-d873-4aa1-83ba-6f87ff19157e
Suga, Takeo
68c29b3f-1f1d-411a-9266-f6c1af267cd8
Nishide, Hiroyuki
2909f7a6-faf4-4e85-89c6-826dd88dccd8
Yang, Liuqing
b08caf82-a1c5-4d3b-99c0-843cce76a53f
Li, Shengtao
b3b766b3-57dc-41b2-a559-98e3df176269
Chen, Guanghui
3de45a9c-6c9a-4bcb-90c3-d7e26be21819
Feng, Yang
f8fa5f60-405c-43d2-80a1-c5bb9ddd9b50
Hasegawa, Yui
82cba96b-d873-4aa1-83ba-6f87ff19157e
Suga, Takeo
68c29b3f-1f1d-411a-9266-f6c1af267cd8
Nishide, Hiroyuki
2909f7a6-faf4-4e85-89c6-826dd88dccd8
Yang, Liuqing
b08caf82-a1c5-4d3b-99c0-843cce76a53f
Li, Shengtao
b3b766b3-57dc-41b2-a559-98e3df176269

Chen, Guanghui, Feng, Yang, Hasegawa, Yui, Suga, Takeo, Nishide, Hiroyuki, Yang, Liuqing and Li, Shengtao (2019) Tuning conformational H‑bonding arrays in aromatic/alicyclic polythiourea toward high energy-storable dielectric material. Macromolecules, 52 (22), 8781-8787. (doi:10.1021/acs.macromol.9b01785).

Record type: Article

Abstract

Polythioureas (PTUs) have been investigated as a dielectric material for an energy-storable capacitor in both experimental and computational approaches. However, the effect of dipolar polarization, closely associated with conformational H-bonding arrays, on dielectric properties under the operating frequency has never been studied in PTUs. Here, a series of PTUs with different spacers and additional dipoles are synthesized to explore the influence of
conformations in thiourea units on their dielectric properties. The additional dipolar substituent (−COOH) contributes to a high dielectric constant, while accompanying a remarkable dielectric loss. Alternatively, a random copolymer is prepared to adjust the −COOH content, which displays a high dielectric constant and a suppressed dielectric loss. However, it requires strict control of the segmental ratio to meet the energy-storage demand. A neat alicyclic PTU with a flexible cyclohexyl spacer also exhibited a high dielectric constant and a low dielectric loss because of its rich trans/trans conformation, which brings about an increasing effective dipole moment per unit volume. Meanwhile, it retains high breakdown strength, thus leading to high electric energy density (Ue ≈ 10 J/cm3). These results suggest that tuning conformational H-bonding arrays based on molecular design is a more effective way to improve the dielectric properties of PTUs toward a very high energy storable material.

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Published date: 11 November 2019

Identifiers

Local EPrints ID: 436058
URI: http://eprints.soton.ac.uk/id/eprint/436058
PURE UUID: fe8fc43a-6a4f-4cf9-bf86-a5e60be5307e

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Date deposited: 27 Nov 2019 17:30
Last modified: 17 Mar 2024 05:04

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Contributors

Author: Guanghui Chen
Author: Yang Feng
Author: Yui Hasegawa
Author: Takeo Suga
Author: Hiroyuki Nishide
Author: Liuqing Yang
Author: Shengtao Li

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