ABSTRACT Polytetrafluoroethylene (PTFE) and polyvinylidene fluoride (PVDF) are usually considered ideal materials for oil–water separation due to their excellent chemical stability, thermal resistance, and hydrophobicity. However, PTFE exhibits poor spinnability in both solution and melt spinning, whereas the fabrication of PVDF fibers typically relies on toxic solvents. To overcome these limitations, a superhydrophobic porous micro/nanofibrous membrane was developed in this work. Specifically, precursor fibers were first prepared by centrifugal spinning using native cassava starch and poly(ethylene oxide) (PEO) as carrier components together with PTFE and PVDF emulsions. Subsequently, fibers with porous structures were obtained by exploiting the different melting temperatures of PTFE and PVDF during sintering. The morphology, structure, thermal stability, and wetting properties were systematically investigated by scanning electron microscopy, X‐ray diffraction, infrared spectroscopy, and contact angle measurements, revealing that the optimal membrane featured a uniformly interconnected porous network with an average fiber diameter of 1.09 ± 0.02 μm. The resulting blend fibrous membrane exhibits excellent superhydrophobicity (water contact angle reaching 154°) and a high oil flux (8500 L/m 2 h). This approach effectively integrates the low surface energy of PTFE with the favorable processability of PVDF, offering a novel design strategy for the fabrication of high‐performance oil–water separation membranes.
Liu et al. (Thu,) studied this question.