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Multiscale synchrotron scattering studies of the temperature-dependent changes in the structure and deformation response of a thermoplastic polyurethane elastomer

Sui, T., Salvati, E., Zhang, H., Dolbnya, I.P. and Korsunsky, A.M. (2019) Multiscale synchrotron scattering studies of the temperature-dependent changes in the structure and deformation response of a thermoplastic polyurethane elastomer Materials Today Advances, 4, 100024.

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Abstract

The distinct molecular architecture and thermomechanical properties of polyurethane block copolymers make them suitable for applications ranging from textile fibers to temperature sensors. In the present study, differential scanning calorimetry (DSC) analysis and macroscopic stress relaxation measurements are used to identify the key internal processes occurring in the temperature ranges between −10 °C and 0 °C and between 60 °C and 70 °C. The underlying physical phenomena are elucidated by the small-angle X-ray scattering (SAXS) and wide-angle X-ray scattering (WAXS) study of synchrotron beams, allowing the exploration of the structure-property relationships as a function of temperature. In situ multiscale deformation analysis under uniaxial cyclic thermomechanical loading reveals a significant anomaly in the strain evolution at the nanoscale (assessed via SAXS) in the range between −10 °C and 0 °C owing to the ‘melting’ of the soft matrix. Furthermore, WAXS measurement of crystal strain within the hard regions reveals significant compressive residual strains arising from unloading at ∼60 °C, which are associated with the dynamic shape memory effect in polyurethane at these temperatures.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
NameEmailORCID
Sui, T.t.sui@surrey.ac.uk
Salvati, E.
Zhang, H.
Dolbnya, I.P.
Korsunsky, A.M.
Date : 27 November 2019
Funders : EPSRC - Engineering and Physical Sciences Research Council
DOI : 10.1016/j.mtadv.2019.100024
Copyright Disclaimer : © 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license(http://creativecommons.org/licenses/by/4.0/).1.
Uncontrolled Keywords : Thermoplastic polyurethane; Synchrotron X-ray scattering; Multi-scale characterization; Thermo-mechanical properties
Additional Information : The authors wish to thank Dr Marzena Tkaczyk and Dr Kalin Dragnevski for their support in carrying out DSC measurements and Prof Cristina Prisacariu for material synthesis. The authors acknowledge the support of EPSRC RCUK via grants EP/I020691/1 and EP/P005381/1 and Diamond Light Source for the provision of access to beamline B16 under allocation MT12472-1. This article is dedicated to the memory of Cristina Prisacariu, who devoted her scientific life to the study of thermoplastic polyurethanes.
Depositing User : Diane Maxfield
Date Deposited : 10 Dec 2019 16:17
Last Modified : 10 Dec 2019 16:17
URI: http://epubs.surrey.ac.uk/id/eprint/853250

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