Polyurethane in silicone rubber for enhanced coating performances
Silicone rubber (SR) based coatings with remarkable antifouling performances have received tremendous interests due to their prominent merits of environmental adaptability, stability, non-toxicity. However, it still remains a great challenge to fabricate SR-based antifouling coatings with both high mechanical properties for the bulk coating and high adhesion properties to substrates. Now, a dual-functional SR-based coating with both antifouling and anticorrosive performances was developed by incorporating polyurethane (PU) chains into the SR framework to form SR/PU interpenetrating polymer networks (SR/PU IPNs), to maintain its high adhesion to metal substrate without compromising surface antifouling properties.
Optimised mechanical properties
By adjusting the mass ratio of SR and PU components, the adhesion of the SR/PU IPNs to the substrate as well as its mechanical properties can be remarkably improved. Compared with the pristine SR, the SR/PU75 IPNs possessed the optimised mechanical properties, with the increases in the Young’s modulus and compression modulus, by ~312 % and ~289 % respectively. Additionally, the adhesion strength of the composite was increased by 369 %. Owing to the synergistic effect of SR/PU IPNs, the SR/PU75 IPNs realised synchronous enhancement of antifouling and anticorrosion performance.
The study has been published in Progress in Organic Coatings, Volume 176, March 2023.