Facile crosslinking of poly(vinylpyrrolidone) by electro-oxidation with IrO2-based anode under potentiostatic conditions

6533b858fe1ef96bd12b5b9b

RESEARCH PRODUCT

Facile crosslinking of poly(vinylpyrrolidone) by electro-oxidation with IrO2-based anode under potentiostatic conditions

Onofrio Scialdone Alessandro Galia Sonia Lanzalaco Ignasi Sirés Maria Antonietta Sabatino Clelia Dispenza

subject

Materials Chemistry2506 Metals and Alloys Radicals (Chemistry)Materials science Polymers Electrolytic cell General Chemical Engineering Radical macromolecular substances 02 engineering and technology Poly(vinylpyrrolidone)010402 general chemistry Electrochemistry 01 natural sciences Electrosynthesi Electrolysis Nanogel Adsorption Electròlisi Materials Chemistry Electrochemistry Chemical Engineering (all)chemistry.chemical_classification Crosslinking Aqueous solution technology industry and agriculture Dimensionally stable anode Oxidació electroquímica Radicals (Química)Polymer Settore ING-IND/27 - Chimica Industriale E Tecnologica 021001 nanoscience & nanotechnology Polímers 0104 chemical sciences Anode Electrolytic oxidation chemistry Chemical engineering Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie 0210 nano-technology Hydroxyl radical Electrode potential

description

Abstract: The modification of polymer architectures by reaction with chemically adsorbed hydroxyl radicals has been thoroughly investigated by electrolyzing dilute aqueous solutions of the biocompatible polymer poly(vinylpyrrolidone) (PVP), using an undivided electrolytic cell with a Ti/IrO2–Ta2O5(DSA®) anode. Several electrolyses were performed to assess the influence of the applied potential, the circulated charge and the PVP concentration, which was always kept low to avoid chain overlapping. From the results obtained, it can be concluded that the electro-oxidation of PVP solutions using a cheap anode is an effective method to crosslink initially isolated polymer chains, eventually increasing the size of their random coils. Furthermore, the average size of the modified macromolecules can be controlled by tuning the electrode potential and/or the current density and the circulated charge. At high anodic potential values, the hydroxyl radicals formed at DSA®were also effective to generate reactive functional groups on the PVP backbone, which is a very interesting feature for future biomedical applications.

year	journal	country	edition	language
2018-07-18	Journal of Applied Electrochemistry

https://doi.org/10.1007/s10800-018-1237-8