Developing an acidproof breathable composite fabric based on fluorinated polyurethane/isotropic pitch electrospun nanofibers

Abstract

To develop a series of novel acidproof and breathable fabric, electrospun fluorinated polyurethane/polyurethane and pitch nanofibers were directly deposited on polyester/cotton blended fabric. The layered and interpenetrated structured membranes were built to study the effects of different structures on the acidproof and breathable performances. The acidproof and breathable mechanism of different structured composite fabrics had been evaluated via emission scanning electron microscope, X-ray photoelectron spectroscopy, contact angle, porosity, pore size, comfort and mechanical test, respectively. The results showed that the layered structured composite fabric had advantages in acidproof property, i.e. the acid (H2SO4, 80%) contact angle was 130° due to the low surface energy caused by the high fluorine content (36.96%). Meanwhile, such structured composite fabric provided double protection, which made the acid-resistance pressure to reach a high value of 1050 Pa, while the interpenetrated structured composite fabric showed superior comfort and mechanical properties. Due to the high porosity (88.01%), the water vapor transport rate and air permeability were 7554.14 g/m2·24h and 46.33 mm/s, respectively. Due to the relative slip of fluorinated polyurethane/polyurethane fibers was restricted, the tensile strength and bursting strength of interpenetrated one was 1315 N and 795 N, which were higher than layered one.

The Synergistic Effect of Terminal and Pendant Fluoroalkyl Segments on Properties of Polyurethane Latex and Its Film

“…Until now, methods concerning fluorinated polyurethane have been mainly included as the imbedding of fluoroalkyl groups into the PU backbone as fluorine-containing small molecule diols [16,17], polyether diols [18] or macromolecular polyether diols [19,20], the immobilizing of fluorinated segments into the PU side chain as fluorine-containing pendant groups diols [21][22][23][24], the blocking of those groups at the two PU tails [25], the distributing of fluorocarbon segments in the hyperbranched PU terminals [26][27][28][29][30], etc. However, the effectiveness of hydrophobic modification was unsatisfactory when using the fluorine-containing small diols, for example, octafluorohexyl diol, where the static water contact angle on its latex films could only attain 97.2 • [16].…”

Natural Biomass Hydrogel Based on Cotton Fibers/PVA for Acid Supercapacitors

“…However, natural cotton is composed of long fiber chains, and hence it is difficult to fabricate its films directly by a simple solution-casting method . In addition, the poor mechanical properties of membranes prepared by pure cotton fibers result in cellulose swelling by the H 2 SO 4 electrolyte, which leads to a collapse of the structure. − In this work, we consider preparing cotton fibers and a PVA composite membrane by immersing into a 1 M H 2 SO 4 electrolyte to fabricate an acid GPE.…”

Hybrid electrospun membrane based on poly(vinylidene fluoride)/poly(acrylic acid)–poly(vinyl alcohol) hydrogel for waterproof and breathable applications

“…Polytetrafluoroethylene (PTFE) membranes have been used extensively for many years as waterproof and breathable membranes. However, these membranes are expensive, and there are difficulties in regulating the porous structure of these membranes [9]. So, it is necessary to develop alternative technologies for producing waterproof and breathable membranes.…”