Understanding the Behavior of Fully Non-Toxic Polypyrrole-Gelatin and Polypyrrole-PVdF Soft Actuators with Choline Ionic Liquids

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ID: 119947
2020
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Abstract
Smart and soft electroactive polymer actuators as building blocks for soft robotics have many beneficial properties that could make them useful in future biomimetic and biomedical applications. Gelatin—a material exploited for medical applications—can be used to make a fully biologically benign soft electroactive polymer actuator that provides high performance and has been shown to be harmless. In our study, these polypyrrole-gelatin trilayer actuators with choline acetate and choline isobutyrate showed the highest strain difference and highest efficiency in strain difference to charge density ratios compared to a reference system containing imidazolium-based ionic liquid and a traditional polyvinylidene fluoride (PVdF) membrane material. As neither the relative ion sizes nor the measured parameters of the ionic liquids could explain their behavior in the actuators, molecular dynamics simulations and density functional theory calculations were conducted. Strong cation-cation clustering was found and the radial distribution functions provided further insight into the topic, showing that the cation-cation correlation peak height is a good predictor of strain difference of the actuators.
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Authors Fred Elhi;Karl Karu;Pille Rinne;Kadi-Anne Nadel;Martin Järvekülg;Alvo Aabloo;Tarmo Tamm;Vladislav Ivaništšev;Kaija Põhako-Esko;Elhi, Fred;Karu, Karl;Rinne, Pille;Nadel, Kadi-Anne;Järvekülg, Martin;Aabloo, Alvo;Tamm, Tarmo;Ivaništšev, Vladislav;Põhako-Esko, Kaija;
Journal actuators
Year 2020
DOI
10.3390/act9020040
URL
https://doi.org/10.3390/act9020040
Keywords
ionic liquid Density functional theory gelatin molecular dynamics actuator choline polypyrrole conductive polymer pvdf ionic liquid Density functional theory gelatin molecular dynamics actuator choline polypyrrole conductive polymer pvdf

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