Synthesis and Characterization of a Water-soluble Ionic Polyacetylene by the Quaternization Polymerization of 2-Ethynylpyridine using (2-Bromoethyl)trimethylammonium Bromide
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Polyacetylene polyelectrolytes are main-chain conjugated polymers whose repeating units bear an electrolyte group. These polyelectrolytes have been studied for the potential applications as hybrid polymer gels, ultrathin films of amphiphilic polyacetylenes, ordered multilayer nanocomposites, nanocrystalline CdS polymer sensitizer, universal interfacial layers for efficient inverted polymer solar cells, and write-once-read-many-times (WORM) memory devices. Here, we report the synthesis of a new polyacetylene polyelectrolyte with the designed substituents by the quaternization polymerization of 2-ethynylpyridine using (2-bromoethyl)trimethyl ammonium bromide. X-ray powder diffraction (XRD) data indicated that this polyelectrolyte is mostly amorphous. The optical and electrochemical properties were measured and discussed. This polyacetylene polyelectrolyte exhibited the irreversible electrochemical behaviors between the doping and undoping peaks.