Exploring the Frontiers of Polymer Science and Technology: From Fundamentals to Applications (English)
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Frog-Skin-Inspired Slippery Antibiofouling Coatings Through Degradable Block Copolymer Wrinkling
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Marine biofouling is a severe concern that widely affects various aspects. Biofouling roughens ship hulls, which results in increased drag and reduced top speed. It also results in increased fuel consumption and hampers instrument function and ship maneuverability.1 In addition to the added shipping cost, ships coated with barnacles and algae can serve as transfer mechanisms for invasive species, which can lead to large-scale damage to local ecosystems.2 Inspired by complex multifunctional frogskins, we created wrinkled slippery coatings with excellent antifouling, anti-icing, and self-cleaning properties through a combination of degradable di-BCP self-assembly (i.e., PS-b-PLA) and hydrolysis-driven dynamic release-induced surface wrinkling. Gyroid-forming PS-b-PLA can form cocontinuous PLA networks in a PS matrix after thermal treatment or solvent annealing. After performing hydrolytic treatment to remove the PLA block and release PS-b-PLA/PDMS bilayer composites, a microwrinkled PS matrix dispersed with network nanochannels was generated. These nanochannels can serve as nanocontainers for sequential lubricant infiltration. Microwrinkled patterns enable the formation of curved surfaces that can resist biofouling because of their surface geometry. Gyroid-forming PS-b-PLA can generate nanoporous templates with cocontinuous nanochannels, which provide strong capillary forces for trapping and storing infiltrated lubricant. Moreover, their antibiofouling performance against different foulers was examined under various conditions. In particular, the formation of an eco-friendly silicon-based lubricant layer without the use of fluorinated compounds and costly material precursors is an advantage in industrial practice. This advantage can be implemented in various applications.3 (1) L. D. Chambers, et al., Surf. Coat. Technol., 201, 3642 (2006). (2) D. Minchin, et al., Biofouling, 19, 111 (2003). (3) T.-L. Chen, et al., Adv. Funct. Mater., 31, 2104173 (2021).