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Deformation behaviour during cold drawing of nanocomposites based on single wall carbon nanotubes and poly(ether ester) copolymers |
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| Authors: | JJ Hernández A Nogales A Sanz BS Hsiao G Broza |
| Affiliation: | a Instituto de Estructura de la Materia, CSIC, Serrano 121, 28006 Madrid, Spain b CELLS - ALBA, 08193 Bellaterra, Barcelona, Spain c Department of Chemistry, State University of New York at Stony Brook, NY 11794-3400, USA d Szczecin University of Technology, Institute of Materials Science and Engineering, Piastow Av. 19, PL-70310 Szczecin, Poland e Technische Universität Hamburg-Harburg, Denickestrasse 15, D-21071 Hamburg, Germany |
| Abstract: | Relationships between the macroscopic deformation behaviour and microstructure of a pure (PBT-b-PTMO) block copolymer and a polymer nanocomposite (PBT-b-PTMO + 0.2 wt% SWCNT) were investigated by simultaneous small- and wide-angle X-ray scattering (SAXS and WAXS) during tensile deformation using synchrotron radiation. The Young's modulus was found to be 15% higher for the nanocomposite than for the pure block copolymer as well as the yield strength, while the elongation-to-break was less than a half. This different behaviour can be explained by taking into account the different structural features revealed by SAXS and WAXS and thus considering that SWCNT act as anchors in the nanocomposite, sharing the applied stress with the PBT crystals and partially preventing the flexible, non-crystallisable PTMO chains to elongate. |
| Keywords: | Polymer nanocomposites Deformation behaviour Simultaneous SAXS and WAXS |
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