The functionalization of conductive polymers using biocompatible ionic liquids (BIO-IL) is a highly promising strategy to obtain conductive materials for biomedical applications. Herein, the present article evaluates the impact of three choline-based BIO-ILs on the in-situ oxidative polymerization of polypyrrole (PPy) over electrospun aligned polycaprolactone (PCL) membranes: choline bitartrate ([Ch][Bt]), containing an organic acid as counter anion; and choline lysine ([Ch][Lys]) as well as choline tyrosine ([Ch][Ty]), both containing amino acid, as counter anions. In most cases, the use of [Ch][Bt] presented little impact on the properties of the membranes. Meanwhile, the use of both [Ch][Lys] and [Ch][Ty] resulted in higher reaction rates due to the stabilizing effects of pyrrole oligomers during polymerization, leading to more uniform coatings with the use of amino acid-based BIO-ILs. Chemical evaluation of the membranes demonstrated that [Ch][Lys] and [Ch][Ty] were incorporated on the PPy structure. Electrical conductivity assays indicated a lower electrical conductivity by the use of the [Ch][Lys] and [Ch][Ty], resulting from interactions between the BIO-ILs and the nitrogen groups of the PPy. In addition, the use of these BIO-ILs perfectly preserves mechanical performances and thermal properties of the PPy.
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