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

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

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Dielectric elastomers (DES) are a promising new transducer technology, but high driving voltages limit their current commercial potential. 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-catalysed azide-alkyne 1,3-dipolar cycloaddition (CuAAC). The copolymers have a high degree of chemical freedom, as the dimethylsiloxane spacer units between the functional groups, as well as the degree of functionalisation, can be varied. Thus, the best overall properties were obtained for an elastomer prepared with a copolymer with a 1200 g mol(-1) dimethylsiloxane spacer unit and 5.6 wt% of the high dielectric permittivity molecule 1-ethynyl-4-nitrobenzene. Here, a high increase in dielectric permittivity (similar to 70%) was obtained without compromising other favourable DE properties such as elastic modulus, gel fraction, dielectric loss and electrical breakdown strength. © 2014 Elsevier Ltd. All rights reserved.
Original languageEnglish
JournalPolymer
Volume55
Issue number24
Pages (from-to)6212-6219
Number of pages8
ISSN0032-3861
DOIs
Publication statusPublished - 2014

Keywords

  • POLYMER
  • ELECTROMECHANICAL RESPONSE
  • COMPOSITES
  • ACTUATORS
  • ENHANCEMENT
  • CONSTANT
  • BLENDS
  • FILLER
  • STRAIN
  • Dielectric elastomers
  • Silicone
  • CuAAC

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