Silicone elastomers with high dielectric permittivity and high dielectric breakdown strength based on tunable functionalized copolymers

Frederikke Bahrt Madsen, Liyun Yu, Anders Egede Daugaard, Søren Hvilsted, Anne Ladegaard Skov

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High driving voltages currently limit the commercial potential of dielectric elastomers (DEs). One method used to lower driving voltage is to increase dielectric permittivity of the elastomer. A novel silicone elastomer system with high dielectric permittivity was prepared through the synthesis of siloxane copolymers, thereby allowing for the attachment of high dielectric permittivity molecules through copper-catalyzed azide-alkyne 1,3-dipolar cycloaddition (CuAAC). The synthesized copolymers allow for a high degree of chemical freedom, as several parameters can be varied during the preparation phase. Thus, the space between the functional groups can be varied, by using different dimethylsiloxane spacer units between the dipolar molecules. Furthermore, the degree of functionalization can be varied accurately by changing the feed of dipolar molecules. As a result, a completely tunable elastomer system, with respect to functionalization, is achieved. It is investigated how the different functionalization variables affect essential DE properties, including dielectric permittivity, dielectric loss, elastic modulus and dielectric breakdown strength, and the optimal degree of chemical functionalization, where these important properties are not significantly compromised, is also determined. Thus, the best overall properties were obtained for a silicone elastomer prepared with 5.6 wt% of the dipolar molecule 1-ethynyl-4-nitrobenzene. Here, a high increase in dielectric permittivity (~70%) was obtained without compromising other vital DE properties such as elastic modulus, gel fraction, dielectric and viscous loss and electrical breakdown strength.
Original languageEnglish
Title of host publicationProceedings of SPIE: Electroactive Polymer Actuators and Devices (EAPAD) 2015
EditorsBar-Cohen Yoseph
Number of pages12
PublisherSPIE - International Society for Optical Engineering
Publication date2015
Article number943012
Publication statusPublished - 2015
EventElectroactive Polymer Actuators and Devices (EAPAD) XVII - Town & Country Resort and Convention Center, San Diego, California, United States
Duration: 9 Mar 201512 Mar 2015
Conference number: 9430


ConferenceElectroactive Polymer Actuators and Devices (EAPAD) XVII
LocationTown & Country Resort and Convention Center
Country/TerritoryUnited States
CitySan Diego, California
SeriesProceedings of the SPIE - The International Society for Optical Engineering

Bibliographical note

Copyright 2015 Society of Photo Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Dielectric elastomer
  • Dielectric constant
  • Permittivity
  • Breakdown
  • Silicone
  • CuAAC
  • Click reaction


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