A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators

Saad Ahmed, Zoubeida Ounaies

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

Electroactive polymer (EAP) based technologies have shown promise in areas such as artificial muscles, actuator, aerospace, medical and soft robotics. Still challenges remain such as low induced forces and defects-driven electrical breakdown, which impede the practical implementation of this technology. Multilayered or stacked configuration can address the low induced force issue whereas self-clearing can be a technique to improve breakdown limit of EAP based actuators. Self-clearing refers to the partial local breakdown of dielectric medium due to the presence of impurities, which in turn results in the evaporation of some of the metalized electrode. After this evaporation, the impurity is cleared and any current path would be safely cut off, which means the actuator continues to perform. It is a widely studied concept in the capacitor community, while it has not been studied much for EAP technologies. In this paper we report a systematic approach to precondition a silver-metalized electroactive polymer (EAP), more specifically P(VDF-TrFE-CTFE) terpolymer, using self-clearing concept. First, we show improvement in the dielectric breakdown strength of EAP based unimorph actuators after pre-clearing the impurities using low electric field (lower than dielectric breakdown of the terpolymer). Inspired by this improvement, we used Weibull statistics to systematically estimate the self-clearing/ preconditioning field needed to clear the defects. Then electrical breakdown experiments are conducted with and without preconditioning the samples to investigate its effect on the breakdown strength of the sample.

Original languageEnglish (US)
Title of host publicationElectroactive Polymer Actuators and Devices (EAPAD) 2016
EditorsFrederic Vidal, Yoseph Bar-Cohen
PublisherSPIE
Volume9798
ISBN (Electronic)9781510600393
DOIs
StatePublished - Jan 1 2016
EventElectroactive Polymer Actuators and Devices (EAPAD) 2016 - Las Vegas, United States
Duration: Mar 21 2016Mar 24 2016

Other

OtherElectroactive Polymer Actuators and Devices (EAPAD) 2016
CountryUnited States
CityLas Vegas
Period3/21/163/24/16

Fingerprint

Electroactive Polymers
electroactive polymers
clearing
Electrode
Breakdown
Actuator
Polymers
Actuators
breakdown
actuators
Electrodes
electrodes
preconditioning
Terpolymers
Impurities
Electric breakdown
electrical faults
impurities
Evaporation
Preconditioning

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

Cite this

Ahmed, S., & Ounaies, Z. (2016). A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators. In F. Vidal, & Y. Bar-Cohen (Eds.), Electroactive Polymer Actuators and Devices (EAPAD) 2016 (Vol. 9798). [97983F] SPIE. https://doi.org/10.1117/12.2222135
Ahmed, Saad ; Ounaies, Zoubeida. / A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators. Electroactive Polymer Actuators and Devices (EAPAD) 2016. editor / Frederic Vidal ; Yoseph Bar-Cohen. Vol. 9798 SPIE, 2016.
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Ahmed, S & Ounaies, Z 2016, A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators. in F Vidal & Y Bar-Cohen (eds), Electroactive Polymer Actuators and Devices (EAPAD) 2016. vol. 9798, 97983F, SPIE, Electroactive Polymer Actuators and Devices (EAPAD) 2016, Las Vegas, United States, 3/21/16. https://doi.org/10.1117/12.2222135

A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators. / Ahmed, Saad; Ounaies, Zoubeida.

Electroactive Polymer Actuators and Devices (EAPAD) 2016. ed. / Frederic Vidal; Yoseph Bar-Cohen. Vol. 9798 SPIE, 2016. 97983F.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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AB - Electroactive polymer (EAP) based technologies have shown promise in areas such as artificial muscles, actuator, aerospace, medical and soft robotics. Still challenges remain such as low induced forces and defects-driven electrical breakdown, which impede the practical implementation of this technology. Multilayered or stacked configuration can address the low induced force issue whereas self-clearing can be a technique to improve breakdown limit of EAP based actuators. Self-clearing refers to the partial local breakdown of dielectric medium due to the presence of impurities, which in turn results in the evaporation of some of the metalized electrode. After this evaporation, the impurity is cleared and any current path would be safely cut off, which means the actuator continues to perform. It is a widely studied concept in the capacitor community, while it has not been studied much for EAP technologies. In this paper we report a systematic approach to precondition a silver-metalized electroactive polymer (EAP), more specifically P(VDF-TrFE-CTFE) terpolymer, using self-clearing concept. First, we show improvement in the dielectric breakdown strength of EAP based unimorph actuators after pre-clearing the impurities using low electric field (lower than dielectric breakdown of the terpolymer). Inspired by this improvement, we used Weibull statistics to systematically estimate the self-clearing/ preconditioning field needed to clear the defects. Then electrical breakdown experiments are conducted with and without preconditioning the samples to investigate its effect on the breakdown strength of the sample.

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PB - SPIE

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Ahmed S, Ounaies Z. A study of metalized electrode self-clearing in electroactive polymer (EAP) based actuators. In Vidal F, Bar-Cohen Y, editors, Electroactive Polymer Actuators and Devices (EAPAD) 2016. Vol. 9798. SPIE. 2016. 97983F https://doi.org/10.1117/12.2222135