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

作者：Madsen Frederikke Bahrt^*; Daugaard Anders Egede; Hvilsted Soren; Benslimane Mohamed Yahia; Skov Anne Ladegaard

来源：Smart Materials and Structures, 2013, 22(10): 104002.

DOI：10.1088/0964-1726/22/10/104002

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 similar to 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.

• 出版日期2013-10