UV‐curable,oxetane‐toughened epoxy‐siloxane coatings for marine fouling‐release coating applications |
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| Authors: | Zhigang Chen Bret Chisholm Jongsoo Kim Shane Stafslien Rachel Wagner Sandeep Patel Justin Daniels Lyndsi Vander Wal Jun Li Kaley Ward Maureen Callow Stephanie Thompson Chavanin Siripirom |
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| Affiliation: | 1. Center for Nanoscale Science and Engineering, North Dakota State University, 1805 NDSU Research Park Drive, Fargo, ND 58102, USA;2. Department of Coatings and Polymeric Materials, North Dakota State University, 1735 NDSU Research Park Drive, Fargo, ND 58102, USA;3. School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK |
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| Abstract: | BACKGROUND: UV‐curable coatings are promising candidates for environmentally friendly marine fouling‐release coatings. Cationic UV‐curable epoxy‐siloxane release coatings show good release performance but suffer from poor coating mechanical properties. A difunctional oxetane monomer, DOX, was co‐photopolymerized with an epoxy‐siloxane oligomer at loading levels from 10 to 40 wt% to obtain toughened fouling‐release coatings. RESULTS: The DOX‐toughened coatings showed enhanced cationic photopolymerization activity, solvent resistance and modulus. DOX‐toughened coatings (10 and 20 wt%) exhibited higher impact resistance. The DOX‐toughened coatings showed no leachate toxicity and the coatings were hydrophobic and non‐toxic to biofilm growth when analyzed with marine bacteria and algae. In general, 10 and 20 wt% DOX‐toughened coatings exhibited better marine bacteria and algae fouling‐release performance among the DOX‐toughened coatings. Pseudo‐barnacle shear release stress for the DOX‐toughened coatings increased with increasing DOX content. Live barnacle reattachment assay showed that 10 and 20 wt% DOX‐toughened coatings had comparable barnacle removal stress to commercial silicone reference coatings. CONCLUSIONS: DOX‐toughened (10 and 20 wt%) UV‐curable epoxy‐siloxane coatings exhibited enhanced mechanical properties and better overall marine fouling‐release performance among the toughened UV‐curable release coatings studied. Copyright © 2008 Society of Chemical Industry |
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| Keywords: | cationic polymerization photopolymerization silicones mechanical properties biofilms |
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