Please wait.'

Page is loading'


Home  > Raw materials & technologies  > Applications  > Protective & Marine coatings  > Diffusion of amphiphiles in silicone-based...

Monday, 16 September 2019
pdf
Raw materials & technologies, Applications, Protective & Marine coatings

Diffusion of amphiphiles in silicone-based fouling-release coatings

Monday, 17 April 2017

In a study, Danish researchers present a novel method for the measurement of diffusion coefficients of PEG-based amphiphiles of different chemistries in PDMS-based fouling-release coatings.

Diffusion of surface-active amphiphiles in silicone-based fouling-release coatings. Source: pixabay.com/CCO

Diffusion of surface-active amphiphiles in silicone-based fouling-release coatings. Source: pixabay.com/CCO

Amphiphiles (i.e. amphiphilic molecules such as surfactants, block copolymers and similar compounds) are used in small amounts to modify the surface properties of polymeric materials. In silicone fouling-release coatings, PEG-based amphiphiles are added to provide biofouling-resistance. The success of this approach relies on the ability of the amphiphiles to diffuse through the coating film and cover the surface of the coating.

PEG-PDMS block copolymers show best properties

The diffusion coefficient of the amphiphiles shows a weak dependency on their molecular weight, although this dependency is much less pronounced than for other rubbery polymeric materials. The biofouling-resistance properties in fouling-release coatings were also studied for these amphiphiles. It was found that the diffusion coefficient does not have any influence on the biofouling-resistance results for the studied compounds. Instead, the chemistry of the hydrophobic block of the amphiphiles is much more significant, with PEG-PDMS block copolymers showing the best properties among the studied compounds.

The study is published in: Progress in Organic Coatings, Volume 106, May 2017, Pages 77–86

top of page
Comments (0)
Add Comment

Post comment

You are not logged in

register