Two silicone nontoxic fouling release coatings: Hydrosilation cured PDMS and CaCO₃ filled, ethoxysiloxane cured RTV11

KJ Wynne Department of Chemical Engineering, Virginia Commonwealth University, Richmond, VA, 23284, USA

GW Swain Division of Marine and Environmental Systems, Oceanography Program, Florida Institute of Technology, Melbourne, FL, 32901, USA

RB Fox Materials Chemistry Branch 6120, Naval Research Laboratory, Washington, DC, 20375, USA

S Bullock Materials Chemistry Branch 6120, Naval Research Laboratory, Washington, DC, 20375, USA; Department of Materials Science and Engineering, University of Maryland, College Park, MD, 20742, USA

J Uilk Department of Chemical Engineering, Virginia Commonwealth University, Richmond, VA, 23284, USA E-mail: [email protected]; Materials Chemistry Branch 6120, Naval Research Laboratory, Washington, DC, 20375, USA

Two silicone coatings have been evaluated for barnacle adhesion. One coating is an unfilled hydrosilation cured polydimethylsiloxane (PDMS) network, while the other is a room temperature vulcanized (RTV), filled, ethoxysiloxane cured PDMS elastomer, RTV11^†. The adhesion strength of one species of barnacle, Balanus eburneus, to the hydrosilation coatings is in the range of 0.37–0.60 kg cm^‐2 while the corresponding range for RTV11 is 0.64–0.90 kg cm^‐2. The easier release of B. eburneus from the hydrosilation cured network compared to RTV11 is discussed in relationship to differences in bulk and surface properties. Preliminary results suggest bulk modulus may be the most important parameter in determining barnacle adhesion strength. In light or mechanical property analysis, a re‐evaluation of surface properties and chemical stability is presented.

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Corresponding author; e‐mail: [email protected]

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Two silicone nontoxic fouling release coatings: Hydrosilation cured PDMS and CaCO₃ filled, ethoxysiloxane cured RTV11

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Two silicone nontoxic fouling release coatings: Hydrosilation cured PDMS and CaCO3 filled, ethoxysiloxane cured RTV11

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Two silicone nontoxic fouling release coatings: Hydrosilation cured PDMS and CaCO₃ filled, ethoxysiloxane cured RTV11