Preparation of 2D leaf-shaped and 3D flower-shaped sandwich-like polyaniline nanocomposites and application on anticorrosion

Yuan Teng Kang, Cheng Chien Wang, Chuh Yung Chen

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4 Citations (Scopus)

Abstract

The synthesis of triple-layer-structured polyaniline (PANI) conductive nanocomposites, including two-dimensional leaf-shaped and three-dimensional flower-shaped types (S-PANI), via a two-step method is proposed in this study. According to scanning electron microscopic measurement, the triple-layer-structured S-PANI consists of a middle layer of nonconductive PANI (N-PANI) at 100 nm thickness and emeraldine-salt-form PANI (ES-PANI) nanolayer at 40–50 nm thickness. The results of Fourier-transform infrared spectroscopy, UV/Vis spectroscopy, and X-ray diffraction pattern demonstrate that the phenazine unit existed within the N-PANI main chain, leading to the poor conductivity of N-PANI. However, the conductivity of the N-PANI can be extremely enhanced by at least nine orders of magnitudes (<10−9–100 S/cm) when a conductive ES-PANI nanolayer is further grown on the N-PANI outer surface. Finally, the results of oxygen transmission test and electrochemical impedance spectroscopy reveal that the leaf-shaped S-PANI, as an additive in epoxy resin, has the best oxygen barrier property (oxygen transmission rate = 5.86 cm3 m−2 day−1) and highest coating resistance (5.53 × 1010 Ω) after 60-day immersion in 0.1 M HCl solution, indicating that the leaf-shaped S-PANI is an excellent anticorrosion additive.

Original languageEnglish
Article number49729
JournalJournal of Applied Polymer Science
Volume138
Issue number4
DOIs
Publication statusPublished - 2021 Jan 20

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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