Silica-polyaniline hybrid materials for epoxy-based anticorrosive coatings

Brasilian researchers have prepared silica-polyaniline hybrid materials by inverse emulsion polymerisation for epoxy-based anticorrosive coatings.

Silica-polyaniline hybrid materials for epoxy-based anticorrosive coatings. Source: Pixabay -

Polyaniline doped with dodecylbenzene sulfonic acid (PAni.DBSA) was prepared by inverse emulsion polymerisation of aniline in toluene medium in the presence of SiO2 nanoparticles.

Hybrid material with smaller particle size

The presence of cetyltrimethylammonium bromide (CTAB) during the aniline polymerisation results in hybrid material with smaller particle size, as indicated by dynamic light scattering analysis and scanning electron microscopy. Also the electrical conductivity of such hybrid is one order higher, as compared with that prepared without CTAB. Moreover, more ordered PAni chain is obtained as indicated by the red shift of the π–polaron transition band observed by UV-vis spectroscopy and higher crystallinity observed by X-ray diffraction analysis.

Anticorrosion efficiency confirmed

Anti-corrosive properties of carbon steel substrate coated with epoxy resin containing 5 wt % of PAni.DBSA and the corresponding SiO2-based hybrid materials were evaluated in 3.5% NaCl solution by electrochemical impedance spectroscopy. The coating resistance increases by one order for the epoxy system containing PAni.DBSA/SiO2 hybrid prepared in the presence of CTAB, thus confirming the anticorrosion efficiency of this hybrid.

The study is published in: Applied Polymer Science, Volume 134, Issue 47, December 15, 2017.

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