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Intrinsic tuning of poly (styrene-butadiene-styrene) (SBS) based self-healing dielectric elastomer actuators with enhanced electromechanical properties
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Ellingford, Christopher, Zhang, Runan, Wemyss, Alan, Bowen, Chris R., McNally, Tony, Figiel, Lukasz and Wan, Chaoying (2018) Intrinsic tuning of poly (styrene-butadiene-styrene) (SBS) based self-healing dielectric elastomer actuators with enhanced electromechanical properties. ACS Applied Materials & Interfaces, 10 (44). pp. 38438-38448. doi:10.1021/acsami.8b13785 ISSN 1944-8244.
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WRAP-intrinsic-tuning-poly-styrene-butadiene-styrene-SBS-McNally-2018.pdf - Accepted Version - Requires a PDF viewer. Download (1767Kb) | Preview |
Official URL: http://dx.doi.org/10.1021/acsami.8b13785
Abstract
The electromechanical properties of a thermoplastic styrene-butadiene-styrene (SBS) dielectric elastomer was intrinsically tuned by chemical grafting with polar organic groups. Methyl thioglycolate (MG) reacted with the butadiene block via a one-step thiol-ene ‘click’ reaction under UV at 25°C. The MG grafting ratio reached 98.5 mol% (with respect to the butadiene alkenes present) within 20 minutes and increased the relative permittivity to 11.4 at 103 Hz, with a low tan δ. The actuation strain of the MG grafted SBS dielectric elastomer actuator was ten times larger than the SBS-based actuator, and the actuation force was four times greater than SBS. The MG grafted SBS demonstrated an ability to achieve both mechanical and electrical self-healing. The electrical breakdown strength recovered to 15% of its original value, and the strength and elongation at break recovered by 25% and 21%, respectively, after three days. The self-healing behaviour was explained by the introduction of polar MG groups that reduce viscous loss and strain relaxation. The weak CH/π bonds through the partially charged (δ+) groups adjacent to the ester of MG and the δ- centre of styrene enable polymer chains to reunite and recover properties. Intrinsic tuning can therefore enhance the electromechanical properties of dielectric elastomers and provides new actuator materials with self-healing mechanical and dielectric properties.
Item Type: | Journal Article | |||||||||
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Subjects: | T Technology > TA Engineering (General). Civil engineering (General) | |||||||||
Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | |||||||||
Library of Congress Subject Headings (LCSH): | Self-healing materials, Conducting polymers, Elastomers -- Electric properties, Dielectric films, Actuators -- Materials, Polymers -- Electric properties | |||||||||
Journal or Publication Title: | ACS Applied Materials & Interfaces | |||||||||
Publisher: | American Chemical Society | |||||||||
ISSN: | 1944-8244 | |||||||||
Official Date: | 7 November 2018 | |||||||||
Dates: |
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Volume: | 10 | |||||||||
Number: | 44 | |||||||||
Page Range: | pp. 38438-38448 | |||||||||
DOI: | 10.1021/acsami.8b13785 | |||||||||
Status: | Peer Reviewed | |||||||||
Publication Status: | Published | |||||||||
Re-use Statement: | This document is the Accepted Manuscript version of a Published Work that appeared in final form in ACS Applied Materials & Interfaces, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://dx.doi.org/10.1021/acsami.8b13785. | |||||||||
Access rights to Published version: | Restricted or Subscription Access | |||||||||
Date of first compliant deposit: | 23 October 2018 | |||||||||
Date of first compliant Open Access: | 15 October 2019 | |||||||||
RIOXX Funder/Project Grant: |
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