Effect of thermally reduced graphene sheets on the phase behavior, morphology, and electrical conductivity in poly[(αmethyl styrene)-co-(acrylonitrile)/poly(methyl-methacrylate) blends

Giovanni Vleminckx, Suryasarathi Bose, Jan Leys, Jan Vermant, Michael Wübbenhorst, Ahmed A. Abdala, Chris MacOsko, Paula Moldenaers

Research output: Contribution to journalArticlepeer-review

55 Scopus citations

Abstract

The effects of thermally reduced graphene sheets (TRG) on the phase separation in poly[(αmethyl styrene)-co-(acrylonitrile)]/poly(methyl- methacrylate) blends were monitored using melt rheology, conductivity spectroscopy, and electron microscopic techniques. The TRG were incorporated in the single-phase material by solution mixing. The composite samples were then allowed to phase separate in situ. The thermodynamics of phase separation have been investigated by monitoring the evolution of the storage modulus (G′) as a function of temperature as the system passes through the binodal and the spinodal lines of the phase diagram. The phase separation kinetics were probed by monitoring the evolution of G′ as a function of time at a quench depth well in the spinodal region. It was observed that TRG significantly influenced the phase separation temperature, the shape of the phase diagram and the rate of phase separation. The state of dispersion of TRG in the blends was assessed using electron microscopy and conductivity spectroscopy measurements. Interestingly, the composite samples (monophasic) were virtually insulators at room temperature, whereas highly conducting materials were obtained as a result of phase separation in the biphasic materials.

Original languageEnglish (US)
Pages (from-to)3172-3180
Number of pages9
JournalACS Applied Materials and Interfaces
Volume3
Issue number8
DOIs
StatePublished - Aug 24 2011

Keywords

  • electrical conductivity
  • melt-rheology
  • morphology
  • phase separation
  • thermally reduced graphene sheets

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