Super-hydrophobic covalent organic frameworks for chemical resistant coatings and hydrophobic paper and textile compositesElectronic supplementary information (ESI) available. See DOI: 10.1039/c7ta01302g

• Main Authors: Mullangi, Dinesh, Shalini, Sorout, Nandi, Shyamapada, Choksi, Bhavin, Vaidhyanathan, Ramanathan
• Format: Article
• Language: English
• ISSN: 2050-7488; 2050-7496
• DOI: 10.1039/c7ta01302g

Covalent organic frameworks are crystalline polymers with modular tunability and ordered pores. If made super-hydrophobic, owing to their flexibility, texture and organic nature, they can be of use in several applications that demand hydrophobic surfaces. Super-hydrophobic surfaces have been developed by introducing micro/nano-asperities on metal surfaces by laser-etching or by nano-structuring their morphologies. Many industrial applications demand super-hydrophobicity under chemically harsh environments, something which such metal-based metastable surfaces cannot guarantee. Evidently, the most abundant are metal-free fluorine based polymer surfaces, but considering long-term environmental benefits developing fluorine-free alternatives is important. Here, porous super-hydrophobic COFs with 2D and pseudo-3D frameworks have been utilized to make coatings with exceptional water-repelling characteristics assisted by their Cassie-Baxter state (contact angle = 163 ± 2°; tilt-angle = 2°, hysteresis = 4°). Importantly, the coatings maintain their super-hydrophobicity even under harsh acidic/basic conditions (pH = 1-14) and towards ice and hot water (80 °C), something where even a lotus leaf fails. Also, their organic nature and fibrous texture enable their facile compositing with paper and textiles. At a mere