Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China.
Mar Pollut Bull. 2023 Sep;194(Pt A):115345. doi: 10.1016/j.marpolbul.2023.115345. Epub 2023 Jul 31.
Polystyrene microspheres compounded with polyethylene glycol-based hydrogel (PS-PEG)/polydimethylsiloxane (PDMS) coatings were prepared using the physical blending method. The chemical structure, surface and interface properties, interlayer adhesion, and tensile properties were tested in this paper. Furthermore, the antifouling performance was evaluated through bovine serum albumin fluorescent protein adsorption testing, marine bacteria adhesion testing, and benthic diatom adhesion testing. The results showed that the coating performance was best when 20 wt% PS-PEG hydrogel was added. Its surface energy was only 19.21 mJ/m, the maximum breaking strength was 1.24 MPa, the maximum elongation rate was 675 %, the elastic modulus was 2.53 MPa, and the anti-stripping rate was 100 %. In addition, the coating with added 20 wt% PS-PEG hydrogel bacterial adherence rate was 5.36 % and 2.45 % after rinsing and washing, respectively, and the removal rate was 54.29 %. In the benthic diatom adhesion test, the chlorophyll concentration a-value was only 0.0017 mg/L after washing with added 20 wt% hydrogel, and the protein desorption rate was 84.19 % higher than PDMS in the fluorescent protein adsorption test. This coating has the 'low adhesion' and 'desorption' characteristics in the three growth stages of biofouling. Meanwhile, the low surface energy of the silicone is stable, and the hydrogel also dynamically migrates to the surface to gradually form a hydration layer, both are synergistic. When 20 wt% PS-PEG hydrogel was added, the coating demonstrated excellent antifouling performance due to its high hydration layer, low surface energy, high elasticity, and high interlayer adhesion. This research is expected to contribute to the practical applications of hydrogel coatings in marine antifouling.
采用物理共混法制备了以聚乙二醇基水凝胶（PS-PEG）/聚二甲基硅氧烷（PDMS）为复合涂层的聚苯乙烯微球。本文对其化学结构、表面及界面性能、层间附着力、拉伸性能进行了测试，并通过牛血清白蛋白荧光蛋白吸附试验、海洋细菌黏附试验和底栖硅藻黏附试验评价了其抗污性能。结果表明，当添加 20wt%PS-PEG 水凝胶时，涂层性能最佳。其表面能仅为 19.21mJ/m，最大断裂强度为 1.24MPa，最大伸长率为 675%，弹性模量为 2.53MPa，剥离率为 100%。此外，添加 20wt%PS-PEG 水凝胶的涂层经冲洗和清洗后细菌黏附率分别为 5.36%和 2.45%，去除率为 54.29%。在底栖硅藻黏附试验中，添加 20wt%水凝胶后冲洗后的叶绿素浓度 a 值仅为 0.0017mg/L，荧光蛋白吸附试验中蛋白质解吸率比 PDMS 高 84.19%。该涂层在生物污损的三个生长阶段具有“低黏附”和“易解吸”的特点。同时，硅酮的低表面能稳定，水凝胶也会动态迁移到表面逐渐形成水合层，两者协同作用。当添加 20wt%PS-PEG 水凝胶时，由于高水合层、低表面能、高弹性和高层间附着力，涂层表现出优异的抗污性能。本研究有望为水凝胶涂层在海洋防污中的实际应用提供参考。
