Multiple-length-scale deformation analysis in a thermoplastic polyurethane

Tan Sui, Nikolaos Baimpas, Igor P. Dolbnya, Cristina Prisacariu, Alexander M. Korsunsky

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)

Abstract

Thermoplastic polyurethane elastomers enjoy an exceptionally wide range of applications due to their remarkable versatility. These block co-polymers are used here as an example of a structurally inhomogeneous composite containing nano-scale gradients, whose internal strain differs depending on the length scale of consideration. Here we present a combined experimental and modelling approach to the hierarchical characterization of block co-polymer deformation. Synchrotron-based small- and wide-angle X-ray scattering and radiography are used for strain evaluation across the scales. Transmission electron microscopy image-based finite element modelling and fast Fourier transform analysis are used to develop a multi-phase numerical model that achieves agreement with the combined experimental data using a minimal number of adjustable structural parameters. The results highlight the importance of fuzzy interfaces, that is, regions of nanometre-scale structure and property gradients, in determining the mechanical properties of hierarchical composites across the scales.

Original languageEnglish
Article number6583
JournalNature Communications
Volume6
DOIs
Publication statusPublished - 2015
Externally publishedYes

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