期刊
ADVANCED FUNCTIONAL MATERIALS
卷 21, 期 23, 页码 4589-4594出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201100884
关键词
dipole grafting; silicone based dielectric elastomer actuators; permittivity enhancement
类别
资金
- German government [FKZ: 13N10684, 13N10685]
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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