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Synthesis, formulation, and characterization of siloxane-modified epoxy-based anticorrosive paints



Diglycidyl ether of bisphenol A epoxy (E) was modified with hydroxyl-terminated polydimethylsiloxane through a ring-opening addition polymerization reaction. The structural elucidation of the siloxane-modified epoxy resin (ES) was carried out with Fourier transform infrared, 1H-NMR, and 13C-NMR spectroscopy techniques. The physicochemical characterization of the synthesized resin (ES) was performed with standard methods. E and ES were subjected to paint formulation with the help of a rutile (TiO2) pigment. The formulated paint systems were cured at room temperature with 1,6-diaminohexane (AH) and 1,3-diaminopropane (AP), which were used as curatives. The E–AH, E–AP, ES–AH, and ES–AP paint systems were applied to mild steel strips. The physicomechanical and anticorrosive performance of the coated panels was evaluated with standard methods. The thermal analysis of these E–amine and ES–amine systems was carried out via thermogravimetric analysis. The effects of siloxane incorporation and amine curatives on the coating properties of the paint systems were also investigated. The ES–AP system exhibited good thermal and corrosion stability performance among all the E and ES paint systems. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 100: 4981–4991, 2006