Cross-linking of Ordered Pluronic/Ionic Liquid Blends for Solid Polymer Electrolytes

ORAL

Abstract

Ion gels were fabricated by cross-linking PPO-PEO-PPO triblock copolymers swollen in a room temperature ionic liquid (IL). The copolymers are modified by esterification to replace the terminal hydroxyl endgroups with methacrylate endgroups. This allows the copolymer/IL blends to be cross-linked by a UV cure, forming a gel. The strong interaction of the IL with the PEO block suppresses PEO crystallization which is necessary for good ion conduction. In addition, the interaction between the IL and PEO is strongly selective for PEO, strengthening microphase separation. Despite this, the low molecular weight copolymers remain disordered in the melt even when blended with the IL. However, high molecular weight copolymers are capable of microphase separating into highly ordered block copolymer morphologies. This difference allows the effect of microphase separation on ion transport to be studied. The effect of block copolymer composition is also studied, by varying the PEO fraction of the copolymer. The resultant gels show high ionic conductivity and solid-like behavior, indicating that these materials may be effective as solid polymer electrolytes.

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Authors

  • Daniel Miranda

    University of Massachusetts, Amherst

  • Craig Versek

    University of Massachusetts, Amherst, University of Massachusetts Amherst Department of Physics

  • Mark Tuominen

    University of Massachusetts, Amherst, UMass Amherst, MA 01003, University of Massachusetts Amherst Department of Physics

  • James J. Watkins

    University of Massachusetts, Amherst, Polymer Science and Engineering, UMASS Amherst, University of Massachusetts, University of Massachusetts Amherst, University of Massachusetts Amherst, Polymer Science and Engineering Department, University of Massachusetts Amherst Department of Polymer Science and Engineering, Department of Polymer Science and Engineering, University of Massachusetts Amherst

  • Thomas P. Russell

    University of Massachusetts Amherst, University of Massachusetts, Amherst, UMass Amherst, University of Massachusetts-Amherst, UMASS-Amherst, University of Massachusetts - Amherst, Polymer Science \& Engineering Department, University of Massachusetts, Amherst