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Enhancement of dielectric permittivity and electromechanical response in silicone elastomers molecular grafting of organic dipoles to the macromolecular Network

  • A novel method is established for permittivity enhancement of a silicone matrix for dielectric elastomer actuators (DEAs) by molecular level modifications of the elastomer matrix. A push-pull dipole is synthesized to be compatible with the silicone crosslinking chemistry, allowing for direct grafting to the crosslinker molecules in a one-step film formation process. This method prevents agglomeration and yields elastomer films that are homogeneous down to the molecular level. The dipole-to-silicone network grafting reaction is studied by FTIR. The chemical, thermal, mechanical and electrical properties of films with dipole contents ranging from 0 wt% to 13.4 wt% were thoroughly characterized. The grafting of dipoles modifies the relative permittivity and the stiffness, resulting in the actuation strain at a given electrical field being improved by a factor of six.

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Author:Bjoern Kussmaul, Sebastian Risse, Guggi Kofod, Remi Wache, Michael WegenerORCiDGND, Denis N. McCarthy, Hartmut Krüger, Reimund GerhardORCiDGND
Parent Title (English):Advanced functional materials
Place of publication:Weinheim
Document Type:Article
Year of first Publication:2011
Year of Completion:2011
Release Date:2017/03/26
Tag:dipole grafting; permittivity enhancement; silicone based dielectric elastomer actuators
First Page:4589
Last Page:4594
Funder:German government [FKZ: 13N10684, 13N10685]
Organizational units:Mathematisch-Naturwissenschaftliche Fakultät / Institut für Physik und Astronomie
Peer Review:Referiert