Development of non-toxic polymer coatings with improved biofoul release properties
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abstract
The corrosion resistance of steel panels coated with crosslinked siloxanes has been evaluated by electrochemical impedance spectroscopy (EIS) during exposure to 0.5 N NaCl. Two fluorinated and a nonfluorinated pentasiloxane have been prepared to develop non-toxic polymer coatings with improved biofoul release properties. Depending on the terminal epoxy group type, two different crosslinking/cure chemistries were utilized. The first type of crosslinking reaction involved room temperature UV cure with a photo-acid catalyst and the second crosslinking reaction was phenol-catalyzed thermal crosslinking with ,-diaminoalkanes [NH2-(CH2) n-NH2]. The EIS data suggest that the nonfluorinated pentasiloxane provided better corrosion protection than the two fluorinated pentasiloxanes and that room temperature UV cure with a photo-acid catalyst provides better corrosion protection than phenol-catalyzed thermal crosslinking.