Redox Polymer–Based Nano‐Objects via Polymerization‐Induced Self‐Assembly. Issue 1 (21st August 2019)

• Record Type: Journal Article
• Authors: Boujioui, Fadoi; Zhuge, Flanco; Gohy, Jean‐François
• Other Names: Schubert Ulrich S. guestEditor.
• Is Part Of: Macromolecular chemistry and physics. Volume 221:Issue 1(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2019-08-21
• Subjects: nitroxide radicals -- polymerization‐induced self‐assembly -- redox flow batteries; Polymers -- Periodicals; Polymerization -- Periodicals; Synthetic products -- Periodicals; Macromolecules -- Periodicals; 547.7
• DOI: 10.1002/macp.201900296
• Languages: English
• ISSNs: 1022-1352

Abstract

Abstract: Poly(2, 2, 6, 6‐tetramethylpiperidinyloxy‐4‐yl‐methacrylate) (PTMA) redox polymer–based nano‐objects are synthesized by polymerization‐induced self‐assembly with poly[oligo(ethylene glycol) methyl ether methacrylate] and poly[(4‐methacryloyloxy)‐2, 2, 6, 6‐tetramethylpiperidinium chloride] as hydrophilic macro‐chain transfer agents. These hydrophilic blocks are used in order to stabilize hydrophobic PTMA blocks in aqueous medium. The accordingly obtained spherical nano‐objects are observed via transmission electron microscopy analysis. Cyclic voltammetry measurements indicate that the nature and the length of coronal blocks influence the redox process of the PTMA core blocks. Moreover, these electroactive nano‐objects display low viscosities with a shear‐thinning behavior, making them suitable as cathode‐active materials for aqueous flow‐assisted electrochemical systems. Abstract : Polymerization‐induced self‐assembly is used to prepare spherical nanoparticles containing a redox poly(2, 2, 6, 6‐tetramethylpiperidinyloxy‐4‐yl‐methacrylate) (PTMA)‐insoluble block. Cyclic voltammetry demonstrates that the nitroxide groups of PTMA can be reversibly oxidized into oxoammonium cations. The obtained solutions show a low viscosity at a 10 wt% polymer concentration with a shear‐thinning behavior, making them ideal candidates for redox flow cells.