Imidazolium-based ionic liquid type dependence of the bending response of polymer actuators

Abstract

Actuators based on polymer blends of poly(vinylidene fluoride) (PVDF) with 40 % of different ionic liquids (IL) are prepared by solvent casting. NTf2] were selected in order to evaluate the effect of anion and cation sizes in the bending properties. The microstructure, mechanical and electrical properties of the blend depend on the IL type, which in turn leads to a different bending response. In particular, the mechanical properties are independent on the IL type but the AC conductivity of the composites depend more on the anion type than on the size of the alkyl chain connected to the imidazolium based cation. Thus, the bending response of the IL/PVDF composites is correlated with the anion and cation sizes and a maximum bending response of 0.3 % is

Ionic Liquid–Polymer Composites: A New Platform for Multifunctional Applications

“…[ 49 ] Thus, actuators based on PVDF and ILs with different anions, [HMIM][Cl] and [HMIM][TFSI] have been developed to study the effect of anion size and filler content on the bending response. [ 50 ] It was observed that the polymer crystallizes in the electroactive β‐phase in the presence of the ILs, regardless of the nature and content of the IL. Moreover, the size of the polymer spherulites decreases with increasing IL concentration and with the incorporation of anions of larger size ( Figure ).…”

“…Different imidazolium‐based ILs were also incorporated into a PVDF matrix to study the effect of the alkyl chain length of the cation ([EMIM] + , [HMIM] + , and [C 10 MIM] + ), and the anion ([TFSI] − and [Cl] − ) on the mechanical and electrical properties of the composites. [ 50 ] The mechanical properties are nearly independent of the IL type, whereas the conductivity is more related to the anion type than to the size of the alkyl chain. The maximum bending response (0.3%) was obtained for the IL [EMIM][TFSI] ( Figure ).…”

“…The maximum bending response (0.3%) was obtained for the IL [EMIM][TFSI] ( Figure ). [ 50 ] The effect of film thickness on the properties of PVDF/[EMIM][TFSI] was also assessed, and it was observed that the bending actuation of the composites varies inversely with the sample thickness. [ 22b ]…”

Fabrication of a High-Performance Bending Actuator Made with a PVC Gel

“…Figure 6 shows the results of dielectric constants of the prepared PVC gels as a function of input frequency. The dielectric constants are increased in the low-frequency range (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20). It can be considered that, in a nonionic PVC gel physically crosslinked with plasticizer, DBA molecules are charged and polarized under the electric field, and then the polarized DBA easily facilitates the free dipole reorientation of the PVC chain in the PVC gel network [28].…”

“…I. Chilibon et al introduced a bending actuator using prepolarized piezoelectric bimorph structure consisting of two PVDF thin films [17]. R. Mejri et al proposed a new method to fabricate a high-performance bending actuator using an ionic liquid/PVDF blend [18]. Babita Gaihre et al synthesized a PPy-PVDF multilayered electroactive polymer and fabricated a bending actuator using the PPy-PVDF multilayered polymer [19].…”