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Sunday, 15 September 2019
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Raw materials & technologies, Applications, Protective & Marine coatings

New class of binders exhibits antifouling activity

Wednesday, 5 February 2014

A study focuses on the assessment of the erosion properties and antifouling performance of silyl ester copolymer-based coatings through laboratory and field tests.

Test showed that the silyl ester methacrylic-based binders did not inhibit the growth of microorganisms
Source: kimberly reinick - Fotolia.com

Test showed that the silyl ester methacrylic-based binders did not inhibit the growth of microorganisms
Source: kimberly reinick - Fotolia.com

Three researchers from Université de Toulon, Laboratoire Matériaux Polymères Interfaces Environnement Marin, France, School of Biological Sciences, University of Portsmouth, UK, and Department of Physical Chemistry, VNU University of Science,  Vietnam, synthesized Silyl ester diblock copolymers via the reversible addition-fragmentation chain transfer polymerization as binders for developing copper-free chemically active coatings. Antifouling (AF) coatings were subsequently prepared using biocides ("Sea-Nine 211”, "Preventol A4S”, and zinc pyrithione).

Field tests showed variations with geographical locations

Laboratory-based bioassays, targeting the growth of selected microorganisms (bacteria and microalgae) and barnacle settlement, highlighted that the silyl ester methacrylic-based binders did not inhibit the growth of microorganisms, are essentially non-toxic to nauplii and reduced the settlement of Amphibalanus amphitrite cyprids. The corresponding biocidal coatings are potent toward bacteria and diatoms but were demonstrated to be toxic against the barnacle larvae. Field test results showed variations with geographical locations: in sub-tropical area, the silyl ester methacrylic-based coatings failed to inhibit the settlement of barnacles; however, field tests performed in Mediterranean Sea for 18 months demonstrated that biocidal silyl ester methacrylic-based coatings were promising candidates.

The study is published in: Progress in Organic Coatings, Volume 77, Issue 3, March 2014, Pages 665-673.

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