期刊
APPLIED MATERIALS TODAY
卷 22, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apmt.2020.100928
关键词
Soft actuators; Ionic liquids; PVDF; Additive manufacturing; Printing; Hybrid materials
资金
- Portuguese Foundation for Science and Technology (FCT) [UID/FIS/04650/2020, UID/QUI/0686/2020, PTDC/FIS-MAC/28157/2017, SFRH/BPD/121526/2016, SFRH/BD/145345/2019, SFRH/BD/131729/2017, SFRH/BD/140842/2018, SFRH/BPD/112547/2015]
- Spanish State Research Agency (AEI)
- European Regional Development Fund (ERFD) [PID2019-106099RB-C43/AEI/10.13039/501100 011033]
- Basque Government Industry and Education Departments under the ELKARTEK program
- Basque Government Industry and Education Departments under the HAZITEK program
- Basque Government Industry and Education Departments under the PIBA program [PIBA-2018-06]
This study developed printable materials for soft actuators based on ionic liquids and fluorinated polymers, demonstrating high ionic conductivity and large displacement, indicating their potential for applications.
Soft actuators are increasingly being required for a variety of application ranging from robotics to biomedicine. This work reports on the development of printable materials for soft actuator applications based on ionic liquids (ILs) and a fluorinated polymer, poly(vinylidene fluoride) (PVDF). ILs sharing the same cation 1-butyl-3-methylimidazolium, [Bmim](+) and different anions (tricyanomethanide, [C(CN3)](-), dicyanamide, [N(CN2)](-) and thiocyanate, [SCN](-)) were incorporated into the PVDF polymer matrix at 40% wt. and processed by direct writing printing technique. Rheological measurements of the IL/PVDF solutions allowed to stablish a correlation between shear stress and viscosity, being observed a shear thinning behavior. Independently of the IL anion, the inclusion ILs leads to variations in the sample morphology related to the formation of significantly smaller spherulites than in PVDF with well-defined borders and an increase of the electroactive beta phase content and crystallinity degree of the polymer. The incorporation of the ILs into the PVDF matrix induces a mechanical plasticizing effect. A maximum ionic conductivity of 5.2 x 10(-5) S/cm has been achieved for the [Bmim][N(CN2)]/PVDF composite. The potential of the developed printable materials as soft actuators has been experimentally demonstrated and theoretically evaluated, the highest displacement of 1.0 mm at an applied voltage of 4 Vpp being obtained for [Bmim][SCN]/PVDF. Finally, the implementation of an all printed micro gripper shows the potential of the materials for applications. (C) 2021 Elsevier Ltd. All rights reserved.
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