Stabilization of PS/PLA cocontinuous blends by interfacial graphene

ORAL

Abstract

Reduced graphene oxide (r-GO) is known to be effective in increasing the conductivity of cocontinuous polymer blends with a lower electrical percolation threshold. However, little is known regarding the localization and dynamics of r-GO along with morphology change during annealing. In this study, we develop a facile method to stabilize the polystyrene (PS)/polylactic acid (PLA) cocontinuous blends with r-GO jammed at interface. In this method, the non-functionalized GO is premixed with PLA via solvent method, and then reduced in-situ at 210oC to obtain a PLA/r-GO polymer composite. This composite is further mixed with PS via batch melt compounding. We observe the migration of r-GO from the PLA phase to the interface during annealing. The interfacial r-GO suppresses the coarsening of cocontinuous morphology and increases the conductivity of the filled polymer blend. Moreover, we systematically investigate the relationship between r-GO localization, rheological and conductivity change during annealing of r-GO filled PLA/PS blends.

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Authors

  • Lian Bai

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Siyao He

    Department of Chemistry, University of Minnesota

  • John Fruehwirth

    Department of Chemical Engineering and Materials Science, University of Minnesota

  • Andreas Stein

    Department of Chemistry, University of Minnesota

  • Xiang Cheng

    Department of Chemical Engineering and Materials Science, University of Minnesota, Univ of Minn - Minneapolis, University of Minnesota, CEMS - University of Minnesota

  • Christopher Macosko

    Univ of Minn - Minneapolis, Department of Chemical Engineering and Materials Science, University of Minnesota Twin Cities, University of Minnesota, Department of Chemical Engineering and Materials Science, University of Minnesota