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Structure and dynamics of titania – poly(N-vinyl caprolactam) composite hydrogels

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Abstract

The morphologies and dynamics of poly(N-vinyl caprolactam) (PVCL) based hydrogels with titania nanoparticles in different states (native, air-dried to a constant weight and swollen in H2O or D2O) are studied by a combination of complementary techniques: wide angle X-ray scattering, small angle neutron scattering, neutron spin echo spectroscopy, differential scanning calorimetry. The results suggest the presence of different structural types of water leading to different properties of the hydrogels. We propose a hierarchical structure of hydrogels spanning from the molecular to the microscopic scale consistent with both the static structure (polymer mesh size, association of the nodes of crosslinks and microchains of PVCL) and the dynamics (rate of relaxation of polymer chains, hydrodynamic polymer-polymer correlation length). The presence of nanoscale titania does not change the molecular structure and nanostructure due to its aggregation into meso-domains, but does affect the microstructure, changing the response rate to a temperature jump from 20 to 50 °C. Titania nanoparticles do not change the equilibrium swelling degree of hydrogels.

Graphical abstract: Structure and dynamics of titania – poly(N-vinyl caprolactam) composite hydrogels

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Publication details

The article was received on 09 Aug 2019, accepted on 18 Nov 2019 and first published on 19 Nov 2019


Article type: Paper
DOI: 10.1039/C9SM01619H
Soft Matter, 2019, Advance Article

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    Structure and dynamics of titania – poly(N-vinyl caprolactam) composite hydrogels

    O. I. Timaeva, G. M. Kuz'micheva, I. I. Pashkin, O. Czakkel and S. Prevost, Soft Matter, 2019, Advance Article , DOI: 10.1039/C9SM01619H

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