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Self-Stabilized Nanoparticles of Intrinsically Conducting Copolymers from 5-Sulfonic-2-Anisidine

Authors

  • Xin-Gui Li,

    Corresponding author
    1. Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 (P.R. China)
    2. Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 (P.R. China)
    • Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 (P.R. China) Fax: (+86) 21-65980524
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  • Qiu-Feng Lü,

    1. Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 (P.R. China)
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  • Mei-Rong Huang

    Corresponding author
    1. Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 (P.R. China)
    2. Key Laboratory of Molecular Engineering of Polymers Fudan University Shanghai 200433 (P.R. China)
    • Institute of Materials Chemistry College of Materials Science and Engineering Tongji University Shanghai 200092 (P.R. China) Fax: (+86) 21-65980524
    Search for more papers by this author

Abstract

Novel copolymer nanoparticles with inherent self-stability, narrow size distribution, and high electrical conductivity are facilely and productively synthesized by the oxidative precipitation polymerization of 5-sulfonic-2-anisidine and aniline in acidic medium without any external stabilizer. The structures of the copolymer particles are systematically characterized by IR and UV/Vis spectroscopy, X-ray diffraction, laser particle-size analysis, atomic force microscopy, field-emission scanning electron microscopy, and high-resolution transmission electron microscopy. The comonomer ratio, oxidant/monomer ratio, and polymerization temperature and medium can be used to optimize the size and conductivity of the nanoparticles. It is found that the nanoparticles exhibit a minimal size and polydispersity index of around 53 nm and 1.045, respectively. Nanocomposite films of the nanoparticles with diacetyl and ethyl celluloses show good thermostability and a low percolation threshold of 0.08 wt%, at which the films retain 89% of the transparency, 96–98% of the strength, and 108 times the conductivity of the matrix film. The synthesis of sulfoanisidine copolymer nanoparticles is thus achieved without the use of external stabilizer, which opens up a simple and general route to the fabrication of nanostructured polymer materials with controllable size, narrow size distribution, intrinsic self-stability, strong dispersibility, high purity, and optimizable electroconductivity.

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