The University of Southampton
University of Southampton Institutional Repository

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.

Text
acs.macromol.9b01785 - Accepted Manuscript
Restricted to Repository staff only until 11 November 2020.
Request a copy
Text
acs.macromol.9b01785
Restricted to Repository staff only
Request a copy

More information

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

Catalogue record

Date deposited: 27 Nov 2019 17:30
Last modified: 16 Dec 2019 17:30

Export record

Altmetrics

Contributors

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

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×