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Open AccessArticle

Impermeable and Compliant: SIBS as a Promising Encapsulant for Ionically Electroactive Devices

1
Department of Electrical & Computer Engineering, Advanced Materials & Process Engineering Laboratory, University of British Columbia, Vancouver, BC V6T 1Z4, Canada
2
Laboratoire de Physicochimie des Polymères et des Interfaces, University of Cergy-Pontoise, 95000 Cergy, France
*
Author to whom correspondence should be addressed.
Robotics 2019, 8(3), 60; https://doi.org/10.3390/robotics8030060
Received: 30 June 2019 / Revised: 21 July 2019 / Accepted: 22 July 2019 / Published: 24 July 2019
(This article belongs to the Special Issue Soft Machines: Integrating Sensing, Actuation and Computation)
Metals and glass are excellent for containing electrolytes and liquids in general, but their rigid mechanics limits their application for mechanically active ionic actuators or flexible/ stretchable electrochemical devices such as batteries and supercapacitors. In this study, we evaluate the performance of spray-coated poly (styrene-block-isobutylene-block-styrene) (SIBS) as a stretchable encapsulant, which suggests that it offers a better combination of compliance and impermeability than any other barrier. We examined the drying time of 360-µm thick encapsulated tri-layer conducting polymer (CP) actuators, comprised of poly(3,4-Ethylenedioxythiophene) (PEDOT) as the CP electrode and an interpenetrated polymer network of polyethylene oxide (PEO) and nitrile butadiene rubber (NBR) as the separator layer, which operates with a 1 M solution of Lithium bis(trifluoromethanesulfonyl)imide (Li+TFSI) in propylene carbonate (PC). A 100-µm thick SIBS encapsulation layer is anticipated to help these devices to retain 80% of stored PC for more than 1000 times longer compared to when there is no encapsulation (from less than 0.5 days to over 1.5 years). This low permeability combined with the low Young’s modulus of the SIBS film, its biocompatibility, biostability, and FDA approval, as well as ease of fabrication, make this thermoplastic elastomer a promising candidate as an encapsulant for flexible ionic devices such as flexible batteries and supercapacitors, ionic-electrode capacitive sensors, and ionically electroactive actuators. This paves the way for using these devices in implantable and in vivo applications. View Full-Text
Keywords: encapsulation; conducting polymer; actuator; ionic electroactive polymer; tri-layer; electrolyte encapsulation; conducting polymer; actuator; ionic electroactive polymer; tri-layer; electrolyte
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Ebrahimi Takalloo, S.; Fannir, A.; Nguyen, G.T.M.; Plesse, C.; Vidal, F.; Madden, J.D.W. Impermeable and Compliant: SIBS as a Promising Encapsulant for Ionically Electroactive Devices. Robotics 2019, 8, 60.

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