Nanoindentation of polyurethane with phase-separated fibrillar structure

abstract: Polyurethane elastomer is investigated by atomic force microscopy (AFM) in a regime of fast nanoindentation (simultaneous getting relief and mechanical properties of the surface). The hard phase of the polymer has a fibrillar structure and inhomogeneously distributed in the softer matrix....

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Main Author: Ilya A. Morozov
Format: Article
Language:English
Published: Elsevier 2021-02-01
Series:Polymer Testing
Subjects:
Online Access:http://www.sciencedirect.com/science/article/pii/S0142941820322674
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author Ilya A. Morozov
author_facet Ilya A. Morozov
author_sort Ilya A. Morozov
collection DOAJ
description abstract: Polyurethane elastomer is investigated by atomic force microscopy (AFM) in a regime of fast nanoindentation (simultaneous getting relief and mechanical properties of the surface). The hard phase of the polymer has a fibrillar structure and inhomogeneously distributed in the softer matrix. The surface is covered by a nanolayer of the soft phase and the obtained relief depends on the depth of indentation: it is necessary to pierce this outer layer to reach the internal fibrillar structure of the polymer. The rate of indentation is not constant and affected by the spring properties of AFM-probe, local phase composition and the depth of indentation. Analysis of the kinetics of the probe-surface interactions allowed to determine the thickness of the outer layer and to establish relationships between the indentation rate and elastic and dissipative properties of the soft and hard regions of the polyurethane surface.
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spelling doaj.art-7be060938f8344a0b16c20c09731c05c2022-12-21T20:00:28ZengElsevierPolymer Testing0142-94182021-02-0194107038Nanoindentation of polyurethane with phase-separated fibrillar structureIlya A. Morozov0Institute of Continuous Media Mechanics UB RAS, Academika Koroleva St. 1, 614013, Perm, Russiaabstract: Polyurethane elastomer is investigated by atomic force microscopy (AFM) in a regime of fast nanoindentation (simultaneous getting relief and mechanical properties of the surface). The hard phase of the polymer has a fibrillar structure and inhomogeneously distributed in the softer matrix. The surface is covered by a nanolayer of the soft phase and the obtained relief depends on the depth of indentation: it is necessary to pierce this outer layer to reach the internal fibrillar structure of the polymer. The rate of indentation is not constant and affected by the spring properties of AFM-probe, local phase composition and the depth of indentation. Analysis of the kinetics of the probe-surface interactions allowed to determine the thickness of the outer layer and to establish relationships between the indentation rate and elastic and dissipative properties of the soft and hard regions of the polyurethane surface.http://www.sciencedirect.com/science/article/pii/S0142941820322674PolyurethaneAtomic force microscopyNanoindentation
spellingShingle Ilya A. Morozov
Nanoindentation of polyurethane with phase-separated fibrillar structure
Polymer Testing
Polyurethane
Atomic force microscopy
Nanoindentation
title Nanoindentation of polyurethane with phase-separated fibrillar structure
title_full Nanoindentation of polyurethane with phase-separated fibrillar structure
title_fullStr Nanoindentation of polyurethane with phase-separated fibrillar structure
title_full_unstemmed Nanoindentation of polyurethane with phase-separated fibrillar structure
title_short Nanoindentation of polyurethane with phase-separated fibrillar structure
title_sort nanoindentation of polyurethane with phase separated fibrillar structure
topic Polyurethane
Atomic force microscopy
Nanoindentation
url http://www.sciencedirect.com/science/article/pii/S0142941820322674
work_keys_str_mv AT ilyaamorozov nanoindentationofpolyurethanewithphaseseparatedfibrillarstructure