Silicones with enhanced permittivity for dielectric elastomer actuators

The research efforts for silicone based elastomers with high dielectric permittivity (epsilon') intensified significantly in the last years since such materials would allow the construction of dielectric elastomer actuators (DEA) with low operation voltages. Polar groups can be introduced to elastomers to adjust their permittivity. The results obtained regarding the functionalization of silicones with polar nitrile (CN) and trifluoropropyl (CF3) groups are presented. Those with CN groups were synthesized via anionic polymerization of nitrile containing cyclosiloxanes or via a post-polymerization modification of functional polysiloxanes. Polysiloxanes containing CF3 groups were prepared by anionic co-polymerization of 1,3,5-tris(3,3,3-trifluoropropyl)-1,3,5-trimethylcyclosiloxane with octamethylcyclotetrasiloxane. Importantly, we have found that all polysiloxanes have glass transition temperatures (T-g) well below room temperature (<-50 degrees C). This ensures that the materials turn into true elastomers after cross-linking. In addition to this, a linear increase in e' with increasing content of polar groups was observed with maximum values of epsilon' = 18 and epsilon' = 8.8 for polysiloxanes modified at every repeating unit with either CN or CF3 groups, respectively.


Editor(s):
Barcohen, Y
Vidal, F
Published in:
Electroactive Polymer Actuators And Devices (Eapad) 2016, 9798, 97982K
Presented at:
SPIE Conference on Electroactive Polymer Actuators and Devices (EAPAD), Las Vegas, NV, MAR 21-24, 2016
Year:
2016
Publisher:
Bellingham, Spie-Int Soc Optical Engineering
ISSN:
0277-786X
ISBN:
978-1-5106-0039-3
Keywords:
Laboratories:




 Record created 2017-03-27, last modified 2018-01-28


Rate this document:

Rate this document:
1
2
3
 
(Not yet reviewed)