Author/Authors :
Hernلndez، نويسنده , , J.J. and Garcيa-Gutiérrez، نويسنده , , M.C. and Nogales، نويسنده , , A. Linares-Rueda، نويسنده , , D.R. and Sanz، نويسنده , , Carlos A. and Sics، نويسنده , , I. and Hsiao، نويسنده , , B.S. and Roslaniec، نويسنده , , Z. and Broza، نويسنده , , G. and Ezquerra، نويسنده , , T.A.، نويسنده ,
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 Youngʹs 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.
