Robust Fluorine-Free Superhydrophobic Amino-Silicone Oil/SiO2 Modification of Electrospun Polyacrylonitrile Membranes for Waterproof-Breathable Application

Superhydrophobic waterproof-breathable membranes have attracted considerable interest-owing to their multifunctional applications in self-cleaning, anti-icing, anticorrosion, outdoor tents, and protective clothing. Despite the researches pertaning to the construction of Superhydrophobic functional membranes by nanopartide finishing have increased-drastically, the disconnected particle component is easy IQ:fall off from the membranes under deformation and wear Conditions,:Which,has restricted their wide use in practice. Here) robust superhydrophobic microporous membranes were prepared via a facile and environmentally friendly strategy by dip-coating amino-silicone oil (ASO), onto the electrospun polyacrylonitrile (PAN) membranes, followed by SiO2 nanoparticles (SiO2, NPs) blade coating. Compared with hydrophilic PAN membranes, the modified membranes exhibited superhydrophobic surface with an advancing water contact angle up to 156 degrees, after introducing ASO as low, surface energy substance, and SiO2 NPs as fillet to reduce the pore size and construct the multihierarchical rough strudture. Varying the concentrations of ASO and SiO2 NPs systematically, the PAN electrospun mernbtanes modified with 1 wt % ASO and 0.1 wt % SiO2 NPs were endowed with good water-resistance (74.3 kPa), relative low thermal Conductivity (0.0028 W m(-1) K-1), modest vapor permeability (11.4 kg m(-2) d(-1)), and air Permeability (20.5 mm s(-1). Besides, the inorganic organic hybrid coating of ASO/SiO2 NPs could maintain its superhydrophobicity even after 40 abrasion cycles. The resulting mernbtanes: were found to resist variations on the pH scale from 0 to 12, and retained their water repellent properties when exposed to harsh acidic and alkali conditions. This facile fabrication of durable fluorine-free superhydrophobic membranes simultaneous with good waterproof-breathable performance provides the advantages for potential applications in self-cleaning materials and versatile protective clothing.