Simultaneous electropolymerization of pyrrole and anionic or cationic polymerizable monomeric ionic liquids. Linear actuation of the attained materials
Reactive and Functional Polymers(2024)
摘要
The simultaneous galvanostatic electrogeneration of polypyrrole (PPy) and a polyanion, or a polycation, from the concomitant solutions of pyrrole and monomeric ionic liquids (PIL) give films of two interpenetrated polymeric networks: polyanion-PPy (PILA-PPy) and polycation-PPy (PILC-PPy), as corroborated by Fourier transform infrared (FTIR) spectroscopy. The linear actuation was characterized by cyclic voltammetry and chronoamperometry in aqueous electrolyte describing cation-driven actuation of the PILA-PPy actuators (cation exchange during oxidation/reduction) and anion-driven actuation of the PILC-PPy actuation. The exchange of a unique ion in each actuator, corroborated by energy dispersive X-ray (EDX) analysis of the oxidized and reduced materials, allows the control of the actuation direction. The concomitant driving electrochemical reactions are described. Coulovoltammetric responses present a closed loop in the studied potential range indicating that only those reactions (oxidation/reduction) are present in the studied potential range (0.65 V and − 0.6 V). The PILC-PPy strain was 8.7% and the stress gradient 1.45 MPa, overcoming 1.5 times those from PILA-PPy actuators, consuming also a higher charge density, having 2.1 times better conductivity and 1.3 times higher diffusion-coefficients. The stability of the actuators was studied by consecutive cycling. The PILA-PPy and PILC-PPy films are characterized by scanning electron microscopy (SEM), FTIR and EDX spectroscopy.
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关键词
PPy,PILA,PILC,Interpenetrated polymer networks,Linear actuation
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