Evaluation of MWCNTs/PDMS composite coating for antifouling applications

 
This work reports on the preparation and characterization of protective antifouling coatings in marine industry. Silicone - based coatings (PDMS) filled with different percentages of multiwall carbon nanotubes (MWCNTs) were prepared. The CNTs were added to enhance the properties (surface and mechanical) of PDMS. The morphology of the samples was studied using a coating thickness gauge and the dispersion of CNTs in their structure by optical and scanning electron microscopy. Their hydrophobic/hydrophilic behavior wasinvestigated by measuring the contact angle. Nanoindentationand nanoscracth tests were conducted to evaluate the mechanical behavior of the coatings samples.A threshold concentration is revealed, beyond which the increase in content of CNTs results in deterioration of the surface and mechanical properties of the coating. Optimal MWCNTs/ PDMS composite showed improved (surface and mechanical) properties indicating a better performance behavior in respect of their mechanical properties, compared to PDMS coating.