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- Title
Preparation and actuated strain properties of functionalized graphene modified polyurethane materials.
- Authors
REN Caijuan; BAI Zhiqing; LIU Xiaojing; SHI Xiangning; LU Wenjing; GUO Jiansheng; ZHUANG Qinliang
- Abstract
Hyper branched polyacrylamides were grafted onto the graphene oxide surface in the form of covalent bonds to reduce the high driving voltage of the dielectric elastomer driver and to obtain large actuated strain. The modified functionalized graphene was doped into polyurethane dielectric elastomers as conductive fillers to increase the actuated strain of polyurethane composites under low electric fields. The obtained polyurethane composites show improved dielectric properties as well as mechanical properties, in which the dielectric constant, tensile strength and elastic modulus of the composites at 3% conductive filler mass fraction are increased by 7.80 times, 38% and 1.04 times, respectively, compared with those of the pure polyurethane. The composites also exhibit excellent actuated strain properties, with a maximum actuated strain of 16.29% at an electric field strength of 22.8 kV/mm, which is much higher than that of pure polyurethane (~1%) at the same electric field.
- Subjects
POLYURETHANES; ELASTOMERS; POLYURETHANE elastomers; GRAPHENE; DIELECTRIC properties; PERMITTIVITY
- Publication
Journal of Donghua University (Natural Science Edition), 2022, Vol 48, Issue 6, p21
- ISSN
1671-0444
- Publication type
Article
- DOI
10.19886/j.cnki.dhdz.2021.0392