Mechanically Robust and Thermally Stable Electrochemical Devices Based on Star-Shaped Random Copolymer Gel-Electrolytes
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We synthesized 6-arm star-shaped PS-r-PMMA copolymers ((S-r-M)6) for mechanically robust and thermally stable ion gels. The (S-r-M)6-based gels exhibited higher elastic modulus (E ~1.67 x 105 Pa), which is more than five-times that (~0.29 x 105 Pa) of linear PS-r-PMMA-based gels. In addition, they showed outstanding thermal stability. For example, the Tgel of (S-r-M)6 gels was ~72 °C, compared with that (~56 °C) of linear PS-r-PMMA-based ion gels. These physical properties of gels were further improved by increasing total molecular weight and the fraction of Sty, giving E of ~3.8 x 105 Pa and Tgel of ~163 °C. The resulting gels were functionalized by introducing ECL luminophores. By utilizing the mechanical robustness of the (S-r-M)6 gels, we fabricated emissive displays through ‘cut-and-stick’ process. Moreover, the thermally stable (S-r-M)6 gels indicated good dimensional stability, offering a chance to demonstrate ECL devices that operate even at high temperatures.