Dipolar cross-linkers for PDMS networks with enhanced dielectric permittivity and low dielectric loss

Frederikke Bahrt, Anders Egede Daugaard, Søren Hvilsted, Mohamed Yahia Benslimane, Anne Ladegaard Skov

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Abstract

Dipole grafted cross-linkers were utilized to prepare polydimethylsiloxane (PDMS) elastomers with various chain lengths and with various concentrations of functional cross-linker. The grafted cross-linkers were prepared by reaction of two alkyne-functional dipoles, 1-ethynyl-4-nitrobenzene and 3-(4-((4-nitrophenyl)diazenyl)phenoxy)-prop-1-yn-1-ylium, with a synthesized silicone compatible azide-functional cross-linker by click chemistry. The thermal, mechanical and electromechanical properties were investigated for PDMS films with 0 to 3.6 wt% of dipole-cross-linker. The relative dielectric permittivity was found to increase by ∼20% at only 0.46 wt% of incorporated dipole without significant changes in the mechanical properties. Furthermore, the dielectric losses were proved to be remarkably low while the electrical breakdown strengths were high.
Original languageEnglish
JournalSmart Materials and Structures
Volume22
Issue number10
Pages (from-to)104002
Number of pages11
ISSN0964-1726
DOIs
Publication statusPublished - 2013

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