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Proceedings Paper

DEA material enhancement with dipole grafted PDMS networks
Author(s): Sebastian Risse; Björn Kussmaul; Hartmut Krüger; Rémi Waché; Guggi Kofod
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Paper Abstract

Silicone elastomers are highly suitable for application in the field of dielectric elastomer actuators (DEA) due to their unique material properties (e.g. low glass temperature, thermal stability, large capability of chemical tailoring). The elastomer forming Polydimethysiloxane (PDMS) employed for this study consists of chains with vinyl termination and is cross linked via hydrosilylation to a cross linking molecule in the presence of platinum catalyst. Here, dipole molecules (N-Allyl-N-methyl-4-nitroaniline) were specifically synthesized such that they could chemically graft to the silicone network. The most prominent advantage of this approach is the achievement of a homogeneous distribution of dipoles in the PDMS matrix and a suppression of phase separation due to the grafting to the junction points of the rubber network. Several films with dipole contents ν ranging from 0 %wt up to 10.9 %wt were prepared. The films were investigated to determine their mechanical (tensile testing), dielectric (dielectric relaxation spectroscopy) and electrical (electrical breakdown) properties. This new approach for composites on the molecular level leads to homogeneous films with enhanced material properties for DEA applications. An increase in permittivity from 3.3 to 6.0, a decrease in electrical breakdown from 130 V/μm to 50 V/μm and a lowering of the mechanical stiffness from 1700 kPa to 300 kPa was observed.

Paper Details

Date Published: 28 March 2011
PDF: 7 pages
Proc. SPIE 7976, Electroactive Polymer Actuators and Devices (EAPAD) 2011, 79760N (28 March 2011); doi: 10.1117/12.881919
Show Author Affiliations
Sebastian Risse, Univ. of Potsdam (Germany)
Björn Kussmaul, Fraunhofer IAP (Germany)
Hartmut Krüger, Fraunhofer IAP (Germany)
Rémi Waché, Univ. of Potsdam (Germany)
Guggi Kofod, Univ. of Potsdam (Germany)

Published in SPIE Proceedings Vol. 7976:
Electroactive Polymer Actuators and Devices (EAPAD) 2011
Yoseph Bar-Cohen; Federico Carpi, Editor(s)

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