基于新型聚烯烃-聚硅氧烷偶联剂制备疏水性材料研究OA

At room temperature,hydrophobic cotton fiber materials were prepared with the impregnation method,and their wetting characteristics,microstructure,chemical composition,and durability were systematically investigated.With cotton fibers as the substrate,polyolefin-polysiloxane as the impregnation solution,and anhydrous ethanol as the solvent,hydrophobic cotton fiber materials were successfully prepared through a single-cloth impregnation process.Optimal impregnation parameters were determined via orthogonal experiments.Surface morphology and chemical composition were characterized and analyzed through scanning electron microscopy(SEM)and Fourier transform infrared spectroscopy(FTIR).Wetting behavior was investigated with a contact angle measuring instrument and a high-definition camera.Self-cleaning performance,abrasion resistance,and chemical stability were evaluated through peel tests,sandpaper abrasion tests,acid-alkali resistance tests,warm water immersion tests and oil absorption rate testing.After polyolefin-polysiloxane impregnation,the surface roughness of hydrophobic cotton fiber materials significantly increased,raising the proportion of trapped air and thereby exhibiting outstanding superhydrophobicity,abrasion resistance,and chemical stability.Chemical structural analysis revealed the disappearance of hydroxyl absorption peaks in the cotton fiber material post-impregnation,with the emergence of a C—O—Si infrared absorption peak at 1 192 cm-1.Combined with scanning electron microscopy(SEM),it was confirmed that the hydrolysis products of polyolefin-polysiloxane underwent grafting reactions with the hydroxyl groups on the cotton fiber surface.This resulted in the cotton fiber surface being coated by the long-chain alkane structure of polyolefin-polysiloxane,forming a dense hydrophobic layer.Wetting performance tests revealed that the hydrophobic cotton fiber material exhibited a water contact angle as high as 170° after impregnation,along with excellent self-cleaning properties,enabling easy stain removal through simple water washing.This hydrophobic cotton fiber material exhibited an adsorption capacity of up to 1037%for light oils(n-hexane),1 437%for aromatic compounds,and as high as 2 580%for heavy oils(such as dichloromethane).Moreover,after more than eight oil-water separation cycles,the water contact angle of this hydrophobic material decreased only to 149°,maintaining excellent hydrophobic performance.Abrasion resistance tests showed that after 20 tape stripping cycles and 20 sandpaper abrasion cycles,the water contact angle of the hydrophobic cotton fiber material remained above 150°.After 48-hour immersion in strong acidic(pH=3)and alkaline(pH=13)solutions,the water contact angle remained above 150°,indicating that its rough nanostructure effectively trapped air to maintain superior hydrophobicity and chemical stability.Furthermore,when continuous use caused the water contact angle to drop below 150°,soaking in a 60℃water bath followed by drying restored the angle to over 168°.This demonstrated the material's recyclability,aligning with sustainable development principles.In summary,the hydrophobic cotton fiber material prepared via the impregnation method exhibits outstanding superhydrophobicity,durability,and recyclability,demonstrating broad application prospects in oil-water separation.