Fabrication of Highly Efficient Flame-Retardant and Fluorine-Free Superhydrophobic Cotton Fabric by Constructing Multielement-Containing POSS@ZIF-67@PDMS Micro–Nano Hierarchical Coatings

Abstract

The facile construction of a cotton fabric with excellent flame-retardant and water-proof abilities is of great interest for multitask requirements. Herein, a nonfluorine, highly efficient, and cost-effective multifunctional cotton fabric was fabricated via sequentially depositing a novel multielement-containing flame-retardant phosphorylated octa-aminopropyl POSS (PPA-POSS) and a fluorine-free superhydrophobic coating of zeolitic imidazolate framework-67@poly(dimethylsiloxane) (ZIF-67@PDMS). Influences of the PPA-POSS concentration and ZIF-67@PDMS formula on the fire retardancy and water repellency of treated cotton were systematically investigated. The optimized flame-retardant sample CTF3 with 6.2 wt % PPA-POSS exhibited a high limiting oxygen index (LOI) of 34% and self-extinguishing ability. CTF3 was further modified with a properly formulated superhydrophobic ZIF-67@PDMS coating. CTF3-PHB2 displayed enhanced thermal stability, flame retardancy, and outstanding superhydrophobicity. Thermogravimetric analysis (TGA) results demonstrated that CTF3-PHB2 presented a high char residue of 35.9%, which was 220.5% higher than that of the control cotton (11.2%). More importantly, the heat release rate (HRR), total heat release (THR), and average effective heat of combustion (av-EHC) values of CTF3-PHB2 were significantly reduced by 51.4, 56.2, and 68.4%, respectively, compared with those of a pure cotton fabric. Moreover, CTF3-PHB2 showed superhydrophobicity (WCA > 159.3°) and good mechanical abrasion resistance. In addition, CTF3-PHB2 also showed protective abilities such as antifouling, self-cleaning, and water/oil separation performances even for strong acid/alkali mixtures. Thereby, it is believed that the PPA-POSS@ZIF-67@PDMS coating is promising for application in multifunctional textile materials.

Integration of Multiple Heterointerfaces in a Hierarchical 0D@2D@1D Structure for Lightweight, Flexible, and Hydrophobic Multifunctional Electromagnetic Protective Fabrics

“…The latter process of mass loss overlaps with the carbonization process of pure PAN fibers. After these thermal decomposition processes, the ZIFs loss a large amount of H, O, N, and other elements without destroying the basic structure of the carbon nanosheet framework, which provides the necessary support for the subsequent selenization treatment [ 57 ]. Furthermore, the high-temperature carbonization process removes lots of surface hydrophilic functional groups from the fibrous composites, which is conducive to the formation of a strong hydrophobic surface.…”

Superhydrophobic Al2O3/MMT-PDMS Coated Fabric for Self-Cleaning and Oil–Water Separation Application

“…However, regarding SEM micrographs with high magnification, it becomes evident that the roughness of the individual fiber in the coated fabric increased through the formation of micro/nanostructures and further polymer coating applied to the surface. 67 Overall, the comprehensive coverage of fibers coated with the Al 2 O 3 /MMT nanocomposite and a subsequent PDMS layer, effective coating on individual fibers, well-dispersed and adherent coating, and the surface roughness are delineated in micrographs at different magnifications (10 to 100 μm).…”

Preparation of multifunctional ceramic foams for sound absorption, waterproofing, and antibacterial applications

“…Furthermore, to provide materials with waterproof properties, the graing of polydimethylsiloxane (PDMS) or uorinecontaining chains is generally adopted because of their low surface energy. [26][27][28][29][30][31] Notably, uorine-containing compounds generally possess a lower surface energy than PDMS, indicating a better waterproof performance. In addition, previous reports have revealed that various liquids can slide off on uorine-modied rough surfaces, whereas, oily liquids would compromise the waterproof property of PDMS-modied rough surfaces, suggesting that uorine-modied porous materials are more suitable for applications in harsh conditions.…”