2 research outputs found
Fouling-Release Performance of Silicone Oil-Modified Siloxane-Polyurethane Coatings
The
effect of incorporation of silicone oils into a siloxane-polyurethane
fouling-release coatings system was explored. Incorporation of phenylmethyl
silicone oil has been shown to improve the fouling-release performance
of silicone-based fouling-release coatings through increased interfacial
slippage. The extent of improvement is highly dependent upon the type
and composition of silicone oil used. The siloxane-polyurethane (SiPU)
coating system is a tough fouling-release solution, which combines
the mechanical durability of polyurethane while maintaining comparable
fouling-release performance with regard to commercial standards. To
further improve the fouling-release performance of the siloxane-PU
coating system, the use of phenylmethyl silicones oils was studied.
Coatings formulations were prepared incorporating phenylmethyl silicone
oils having a range of compositions and viscosities. Contact angle
and surface energy measurements were conducted to evaluate the surface
wettability of the coatings. X-ray photoelectron spectroscopy (XPS)
depth profiling experiments demonstrated self-stratification of silicone
oil along with siloxane to the coating-air interface. Several coating
formulations displayed improved or comparable fouling-release performance
to commercial standards during laboratory biological assay tests for
microalgae (<i>Navicula incerta</i>), macroalgae (<i>Ulva linza</i>), adult barnacles (<i>Balanus amphitrite</i> syn. <i>Amphibalanus amphitrite</i>), and mussels (<i>Geukensia demissa</i>). Selected silicone-oil-modified siloxane-PU
coatings also demonstrated comparable fouling-release performance
in field immersion trials. In general, modifying the siloxane-PU fouling-release
coatings with a small amount (1–5 wt % basis) of phenylmethyl
silicone oil resulted in improved performance in several laboratory
biological assays and in long-term field immersion assessments