Permeability of a Zinc-Methacrylate-Based Self-Polishing Copolymer for Use in Antifouling Coating Materials by Molecular Dynamics Simulations

Molecular dynamics simulations were used to investigate the solubility and permeability of H(2)O in a self-polishing copolymer (SPC) with two zinc methacrylate (ZMA) contents (Z2: 2 mol% ZMA; Z16: 16 mol% ZMA) and ethyl acrylate, methyl methacrylate, 2-methoxyethyl acrylate, and butyl acrylate as antifouling agents. Water was found to be more soluble in hydrated Z16 than Z2 because ZMA interacts strongly with H(2)O. In contrast, the diffusion coefficient of H(2)O in Z16 is lower than that of Z2 because H(2)O molecules are more constrained in the former due to strong ZMA/H(2)O interactions. Z16 was found to be significantly more permeable than Z2 over time. The SPC hydrated region in Z2 tends to expand toward the SPC region, while the analogous region in Z16 swelled toward both the SPC and H(2)O regions to leach SPC owing to the higher permeation of H2O into the SPC. These results reveal that H(2)O permeability can be controlled by adjusting the ZMA content, which provides insight into antifouling performance.