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Preparation of 2D leaf‐shaped and 3D flower‐shaped sandwich‐like polyaniline nanocomposites and application on anticorrosion
Author(s) -
Kang YuanTeng,
Wang ChengChien,
Chen ChuhYung
Publication year - 2021
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.49729
Subject(s) - polyaniline , materials science , dielectric spectroscopy , nanocomposite , fourier transform infrared spectroscopy , conductivity , coating , transmission electron microscopy , conductive polymer , composite material , electrical conductor , chemical engineering , epoxy , scanning electron microscope , x ray photoelectron spectroscopy , electrochemistry , nanotechnology , polymer , chemistry , polymerization , electrode , engineering
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 –10 0 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 cm 3 m −2 day −1 ) and highest coating resistance (5.53 × 10 10 Ω) after 60‐day immersion in 0.1 M HCl solution, indicating that the leaf‐shaped S‐PANI is an excellent anticorrosion additive.