Abstract
In this study, polyamidoamine hardener (PAH) is modified with 3-glycidoxypropyltrimethoxysilane (GPTMS) through ring opening addition polymerization reaction. The structural elucidation of the siloxane-modified hardener (SMH) was carried out by FT-IR spectroscopic technique. Average particle size of silica particles in the solution of SMH was about 5 nm using light scattering technique. Using PAH as control, PAH and SMH were mixed with diglycidyl ether of bisphenol A (DGEBA) epoxy resin and applied on mild steel strips as varnish formulations. Then, the epoxy-PAH and epoxy-SMH coated panels were cured at room temperature. Evaluated by salt-spray tests, the anti-corrosive performance of the epoxy-SMH varnish was remarkably enhanced in comparison with that of the epoxy-PAH varnish. Moreover, scanning electron microscopy (SEM) was used to monitor the interface of the varnish films with the substrate. Surface topography of the coatings investigated by atomic force microscopy (AFM) and transmission electron microscopy (TEM) indicated that the silica particles’ dimensions of the siloxane-modifed coating are at the nanoscale.
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