Non-toxic, anti-fouling silicones with variable PEO–silane amphiphile content
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© 2016, ICE Publishing. All rights reserved. Non-toxic silicone coatings with improved resistance to diatom slime formation were prepared by simple blending and curing with a PEO-silane amphiphile: α-(EtO)3Si-(CH2)2-oligodimethylsiloxane13-block-poly(ethylene oxide)8-OCH3. Coatings were formed by blending varying levels (1, 5, and 10 wt%) into an RTV, silica reinforced silicone. The coatings were subjected to a series of biofouling tests, including exposure to Bacillus and Pseudoalteromonas bacteria and Cylindrotheca closterium diatoms, both individually as well as a mixed community of Bacillus and C. closterium. Additionally, microfouling was evaluated upon exposure of silicone coatings to natural seawater by submersion in the Atlantic Ocean for extended periods. Biofouling was assessed in terms of percent coverage, biomass, and average thickness based on confocal laser scanning microscopy (CLSM) images. For all tests, silicones modified with 5 and 10 wt% PEO-silane amphiphile exhibited similarly high anti-biofouling behavior. In addition, silicone coatings modified with just 1 wt% PEO-silane amphiphile displayed a marked improvement on resistance to C. closterium diatom settlement compared to the unmodified silicone.
author list (cited authors)
Faÿ, F., Hawkins, M. L., Réhel, K., Grunlan, M. A., & Linossier, I.