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Issue 15, 2019
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Functional selenium modified microgels: temperature-induced phase transitions and network morphology

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Abstract

Microgels that host selenium and mimic the structure of the enzyme glutathione peroxidase are of great interest for biotechnological and catalytic applications. For this purpose selenium-functionalized thermoresponsive poly(N-vinylcaprolactam) (PVCL) microgels with cleavable diselenide crosslinks have been investigated. Thermodynamic and morphological parameters characterizing the temperature-induced phase transitions of dual crosslinked PVCL microgels were obtained using dynamic light scattering (DLS), 1H high-resolution magic-angle sample-spinning (MAS) NMR spectroscopy, and transverse magnetization (T2) NMR relaxometry. Quantities obtained from Flory–Rehner theory, a two-state model and Boltzmann sigmoidal function were used to relate the phase transitions of the dual crosslinked microgels to the transition temperature, entropy, temperature width of the phase transition, Flory interaction parameters, average number of strands, polymer volume fraction of the collapsed microgels, core–corona fractions and chain dynamics. The morphology of the selenium modified microgels after the oxidation and reduction processes was investigated by 1H T2 NMR and further correlated with the crosslink density.

Graphical abstract: Functional selenium modified microgels: temperature-induced phase transitions and network morphology

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Publication details

The article was received on 31 Dec 2018, accepted on 15 Mar 2019 and first published on 18 Mar 2019


Article type: Paper
DOI: 10.1039/C8SM02646G
Soft Matter, 2019,15, 3227-3240

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    Functional selenium modified microgels: temperature-induced phase transitions and network morphology

    K. H. Tan, D. E. Demco, R. Fechete and A. Pich, Soft Matter, 2019, 15, 3227
    DOI: 10.1039/C8SM02646G

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