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One for all: cobalt-containing polymethacrylates for magnetic ceramics, block copolymerization, unexpected electrochemistry, and stimuli-responsiveness

Rüttiger, C. and Pfeifer, V. and Rittscher, V. and Stock, D. and Scheid, D. and Vowinkel, S. and Roth, F. and Didzoleit, H. and Stühn, B. and Elbert, J. and Ionescu, E. and Gallei, M. (2016):
One for all: cobalt-containing polymethacrylates for magnetic ceramics, block copolymerization, unexpected electrochemistry, and stimuli-responsiveness.
In: Polymer Chemistry, The Royal Society of Chemistry, pp. 1129-1137, 7, (5), DOI: 10.1039/c5py01845e, [Online-Edition: https://pubs.rsc.org/en/Content/ArticleLanding/2016/PY/C5PY0...],
[Article]

Abstract

Novel cobalt-containing homo- and diblock copolymers with poly(methyl methacrylate) (PMMA) are synthesized by atom transfer radical polymerization (ATRP) of a neutral cobalt-complex methacrylate. An efficient route for a single-step synthesis of the cobalt precursor based on easily-available starting materials followed by esterification with methacrylic acid is presented. The cobalt-methacrylate monomer is furthermore polymerized by thermal, free radical and statistical copolymerization with MMA and investigated with respect to (absolute) molar masses, polymer composition, and thermal properties. ATRP affords block copolymers as evidenced by 1H NMR spectroscopy, size exclusion chromatography (SEC) and differential scanning calorimetry (DSC). The cobalt-containing homopolymers are investigated and tailored with respect to their thermal conversion into magnetic cobalt oxides and elemental cobalt which is evidenced by X-ray diffraction (XRD), Raman spectroscopy, and superconducting quantum interference device (SQUID) magnetometry measurements. The (reversible) electrochemistry of the cobalt-containing polymethacrylates and block copolymers thereof are thoroughly addressed by cyclic voltammetry (CV) studies. Interestingly, the prepared metalloblock copolymers exhibit redox-responsiveness (both reduction and oxidation) and thus structure formation in the presence of a reduction or oxidation reagent are demonstrated by transmission electron microscopy (TEM).

Item Type: Article
Erschienen: 2016
Creators: Rüttiger, C. and Pfeifer, V. and Rittscher, V. and Stock, D. and Scheid, D. and Vowinkel, S. and Roth, F. and Didzoleit, H. and Stühn, B. and Elbert, J. and Ionescu, E. and Gallei, M.
Title: One for all: cobalt-containing polymethacrylates for magnetic ceramics, block copolymerization, unexpected electrochemistry, and stimuli-responsiveness
Language: English
Abstract:

Novel cobalt-containing homo- and diblock copolymers with poly(methyl methacrylate) (PMMA) are synthesized by atom transfer radical polymerization (ATRP) of a neutral cobalt-complex methacrylate. An efficient route for a single-step synthesis of the cobalt precursor based on easily-available starting materials followed by esterification with methacrylic acid is presented. The cobalt-methacrylate monomer is furthermore polymerized by thermal, free radical and statistical copolymerization with MMA and investigated with respect to (absolute) molar masses, polymer composition, and thermal properties. ATRP affords block copolymers as evidenced by 1H NMR spectroscopy, size exclusion chromatography (SEC) and differential scanning calorimetry (DSC). The cobalt-containing homopolymers are investigated and tailored with respect to their thermal conversion into magnetic cobalt oxides and elemental cobalt which is evidenced by X-ray diffraction (XRD), Raman spectroscopy, and superconducting quantum interference device (SQUID) magnetometry measurements. The (reversible) electrochemistry of the cobalt-containing polymethacrylates and block copolymers thereof are thoroughly addressed by cyclic voltammetry (CV) studies. Interestingly, the prepared metalloblock copolymers exhibit redox-responsiveness (both reduction and oxidation) and thus structure formation in the presence of a reduction or oxidation reagent are demonstrated by transmission electron microscopy (TEM).

Journal or Publication Title: Polymer Chemistry
Volume: 7
Number: 5
Publisher: The Royal Society of Chemistry
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
05 Department of Physics
05 Department of Physics > Institute for condensed matter physics
05 Department of Physics > Institute for condensed matter physics > Experimental Condensed Matter Physics
07 Department of Chemistry
07 Department of Chemistry > Fachgebiet Makromolekulare Chemie
Date Deposited: 26 Oct 2018 13:05
DOI: 10.1039/c5py01845e
Official URL: https://pubs.rsc.org/en/Content/ArticleLanding/2016/PY/C5PY0...
Funders: Fonds der Chemischen Industrie, Max-Buchner Foundation (Dechema), German Academic Exchange Service (DAAD) for a Postdoctoral fellowship
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