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

Autor: Onofrio Scialdone, Alessandro Galia, Sonia Lanzalaco, Ignasi Sirés, Maria Antonietta Sabatino, Clelia Dispenza
Přispěvatelé: Sonia Lanzalaco, Ignasi Sirés, Alessandro Galia, Maria Antonietta Sabatino, Clelia Dispenza, Onofrio Scialdone
Rok vydání: 2018
Předmět:
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
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
Zdroj: Dipòsit Digital de la UB
Universidad de Barcelona
ISSN: 1572-8838
0021-891X
Popis: 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.
Databáze: OpenAIRE
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