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Polyaniline‐grafted polyurethane coatings for corrosion protection of mild steel surfaces
Author(s) -
Karmakar Himadri S.,
Arukula Ravi,
Thota Apparao,
Narayan Ramanuj,
Rao Chepuri R. K.
Publication year - 2018
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.45806
Subject(s) - polyurethane , isocyanate , materials science , polyaniline , corrosion , thermogravimetric analysis , electrochemistry , differential scanning calorimetry , polymer chemistry , nuclear chemistry , chemical engineering , composite material , polymer , polymerization , chemistry , electrode , physics , engineering , thermodynamics
We report the superior corrosion‐resistant properties of conducting polyurethane networks of polyaniline (PANI), poly‐ m ‐aminophenol (PmAP), and poly‐ o ‐anisidine (PoA) coated on mild steel panels. These networks were prepared by blending conducting polyanilines with isocyanate‐containing prepolyurethanes. Free‐standing polyurethane films were obtained after a moisture cure for several days to ensure complete reaction of the excess isocyanate. The films were electrochemically active with conductivity in the range of 10 −2 to 10 −3 S/cm. The solution blends and formed films were characterized by infrared, ultraviolet, thermogravimetric analysis, and differential scanning calorimetry. Electrochemical corrosion studies of the coated films on mild steel panels showed excellent corrosion protection in the following order: PU‐PANI > PU‐PmAP > PU‐PoA. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018 , 135 , 45806.