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Golitsyn Y, Schneider GJ, Saalwächter K, et al. Reduced-mobility layers with high internal mobility in poly(ethylene oxide)-silica nanocomposites. J Chem Phys. 2017;146(20):203303doi: 10.1063/1.4974768.
Golitsyn, Y., Schneider, G. J., Saalwächter, K., Hansen, S. G., & Machalicek, W. (2017). Reduced-mobility layers with high internal mobility in poly(ethylene oxide)-silica nanocomposites. The Journal of chemical physics, 146(20), 203303. https://doi.org/10.1063/1.4974768
Golitsyn, Yury, et al. "Reduced-mobility layers with high internal mobility in poly(ethylene oxide)-silica nanocomposites." The Journal of chemical physics vol. 146,20 (2017): 203303. doi: https://doi.org/10.1063/1.4974768
Golitsyn Y, Schneider GJ, Saalwächter K, Hansen SG, Machalicek W. Reduced-mobility layers with high internal mobility in poly(ethylene oxide)-silica nanocomposites. J Chem Phys. 2017 May 28;146(20):203303. doi: 10.1063/1.4974768. PMID: 28571377.
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J Chem Phys. 2017 May 28;146(20):203303. doi: 10.1063/1.4974768.

Reduced-mobility layers with high internal mobility in poly(ethylene oxide)-silica nanocomposites.

The Journal of chemical physics

Yury Golitsyn, Gerald J Schneider, Kay Saalwächter, Hansen, Machalicek

Affiliations

  1. Institut für Physik-NMR, Martin-Luther-Universität Halle-Wittenberg, Betty-Heimann-Street 7, D-06120 Halle, Germany.
  2. Department of Chemistry and Department of Physics, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

PMID: 28571377 DOI: 10.1063/1.4974768

Abstract

A series of poly(ethylene oxide) nanocomposites with spherical silica was studied by proton NMR spectroscopy, identifying and characterizing reduced-mobility components arising from either room-temperature lateral adsorption or possibly end-group mediated high-temperature bonding to the silica surface. The study complements earlier neutron-scattering results for some of the samples. The estimated thickness of a layer characterized by significant internal mobility resembling backbone rotation ranges from 2 nm for longer (20 k) chains adsorbed on 42 nm diameter particles to 0.5 nm and below for shorter (2 k) chains on 13 nm particles. In the latter case, even lower adsorbed amounts are found when hydroxy endgroups are replaced by methyl endgroups. Both heating and water addition do not lead to significant changes of the observables, in contrast to other systems such as acrylate polymers adsorbed to silica, where temperature- and solvent-induced softening associated with a glass transition temperature gradient was evidenced. We highlight the actual agreement and complementarity of NMR and neutron scattering results, with the earlier ambiguities mainly arising from different sensitivities to the component fractions and the details of their mobility.

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