| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 693361 | Progress in Organic Coatings | 2012 | 6 Pages |
For the first time, polyurethanefattyamide/silica [PULFAS] based organic–inorganic hybrid coatings were prepared at ambient temperature to combat the corrosion of mild steel. The coating material was synthesized in situ by the reaction of Linseed diol fattyamide (HELA) and tetraethoxy orthosilicate (TEOS, 20–30 phr) at 80 °C, followed by the addition of calculated amount of toluene-2,4-diisocyanate (TDI) in the reaction setup at room temperature. The formation of PULFAS was confirmed by FTIR spectral technique while morphology of the same was observed by optical micrography. The physico-mechanical properties of PULFAS coatings such as scratch hardness, impact resistance, bend test and gloss along with coating thickness were evaluated by standard methods. Thermal stability of PULFAS was investigated by thermogravimetric analysis (TGA). Curing behavior of PULFS was studied by differential scanning calorimetry (DSC). Corrosion resistance performance of the hybrid coatings was evaluated by potentio dynamic polarization (PDP) measurements in different corrosive environments at room temperature. Salt spray test of PULFAS coatings was carried out in 3.5 wt% NaCl solution. The corrosion protection mechanism of the same was also investigated. The results showed that PULFAS coatings exhibit good physico-mechanical properties with excellent performance against the corrosive environments.
Graphical abstractPolyurethanefattyamide/silica [PULFAS] based organic–inorganic hybrid was synthesized by in situ reaction of Linseed diol fattyamide (HELA) and tetraethoxy orthosilicate (TEOS, 20–30 phr) followed by the reaction of toluene-2,4-diisocyanate (TDI). Optical micrograph shows the presence of spherical Si–O–Si surrounded by PULFA chain.Figure optionsDownload full-size imageDownload as PowerPoint slideHighlights► Polyurethanefattyamide/silica hybrid coating materials were synthesized in situ. ► Ambient cured hybrid coatings exhibit good physico-mechanical properties. ► Potentiodynamic polarization measurement shows excellent performance.
