Journal
SUSTAINABLE MATERIALS AND TECHNOLOGIES
Volume 36, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.susmat.2023.e00631
Keywords
Self-healable polyurethane; Fabric surface treatment; Superhydrophobic coating; Durable polymer coating
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A new self-healable coating formulation based on waterborne organic silicone polyurethane has been proposed, which integrates disulfide groups into polyurethane molecules. The coating demonstrates high self-healing efficiency of up to 90.8% and maintains excellent superhydrophobic performance on cotton fabric even after severe damage. It also exhibits outstanding self-healing ability, as the damaged surface can self-heal after heating. Moreover, the coating shows great durability, retaining superhydrophobicity and oil/water-separation efficiency even after multiple washes and wearings.
While superhydrophobic coatings have been widely used for surface modification and protection, most suffer from relatively short service life due to the lack of self-healing mechanisms. Herein, a new self-healable coating formulation based on waterborne organic silicone polyurethane has been proposed by integrating disulfide groups into polyurethane molecules. The bulk polyurethane material with disulfide groups shows high self-healing efficiency of up to 90.8%. The polyurethane coating on cotton fabric showed high superhydrophobic performance even after severe damage. Furthermore, the coating showed excellent self-healing ability. The damaged surface could self-heal after heating at 80 degrees C for half an hour. The coating also exhibited excellent superhydrophobicity and extremely high oil/water-separation efficiency, even after experiencing 80 washes or being worn 800 times. The combination of superior self-healing ability and superhydrophobic properties of the waterborne organic silicone polyurethane coating provides a general approach for the long-term application of such coatings in harsh environments.
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