Macromolecular Research

The Polymer Society of Korea (한국고분자학회)
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Micro-Chemical Structure of Polyaniline Synthesized by Self-Stabilized Dispersion Polymerization

  • NamGoong, Hyun (Kolon Central Research Park) ;
  • Woo, Dong-Jin (Department of Molecular Science and Technology, Ajou University) ;
  • Lee, Suck-Hyun (Department of Molecular Science and Technology, Ajou University)
  • Published : 2007.12.31
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Abstract

A variety of NMR techniques were applied to the micro-chemical structural characterization of polyanilines prepared via an efficient synthetic method in a self-stabilized dispersion medium in which the polymerization was conducted in a heterogeneous organic/aqueous biphasic system without any stabilizers. Here, the monomer and growing polymer chain were shown to function simultaneously as a stabilizer, imparting compatibility for the dispersion of the organic phase, and as a form of flexible template in an aqueous reaction medium. Polymerizations predicated on this concept generated polyanilines with a low defect content: solution state $^{13}C-NMR$ and solid $^{13}CDD/CP/MAS$ spectroscopy indicated that the synthesized HCPANi and its soluble derivative, HCPANi-t-BOC, evidenced distinctly different NMR spectra with fewer side peaks, as compared to conventionally prepared PANis, and the complete structural assignments of the observed NMR peaks could be determined via the combination of both 1D and 2D techniques. Ortho-linked defects in HCPANi were estimated to be as low as 7%, as shown by a comparison of the integration of the carbonyl carbon resonance peaks.

Keywords

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