Synthesis and characterization of soluble conducting poly(aniline-co-2, 5-dimethoxyaniline)

Li Ming Huang, Ten Chin Wen, A. Gopalan

Research output: Contribution to journalArticlepeer-review

61 Citations (Scopus)


Copolymers of 2,5-dimethoxyaniline (DMA) with aniline (ANI), poly(DMA-co-ANI), were prepared for different molar feed compositions of DMA/ANI (fDMA/fANI) by chemical oxidative polymerization using ammonium persulfate as oxidant. The copolymers were characterized by elemental analysis (EA), cyclic voltammetry (CV), Fourier transfer infrared (FTIR) spectroscopy and thermogravimetric analysis (TGA). EA results show that molar composition of DMA units (FDMA) increased with increasing fDMA up to 0.60. A compositional drift in FDMA was noticed when the feed ratio of DMA was increased beyond 0.60. The redox characteristics of the copolymers with different FDMA were found to show variations than PDMA and PANI. UV-Visible spectroelectrochemical studies, TGA and FTIR spectroscopic analysis were used to identify the differences in the optical, thermal properties and structure between the copolymers and PDMA or PANI. The conductivity of the copolymer was found to decrease with increasing FDMA. The copolymers were soluble in N-methylpyrroldione, dimethylformamide, tetrehydrofuran and acetone. The solubility of the copolymers increased with increasing FDMA. The presence of -OCH3 groups in the phenyl ring of DMA units induced easy oxidation and better solubility for the copolymers in comparison with PANI.

Original languageEnglish
Pages (from-to)1765-1774
Number of pages10
JournalMaterials Letters
Issue number12
Publication statusPublished - 2003 Mar

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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