Hydrophobic ozone-stable PVDF membrane with high mechanical stability

摘要

The membrane has a wall provided with a microporous protection layer, where a separation layer with a thickness in a range from 0.01 t o5 micrometers is provided in the wall and is limited at the protection layer at an outer surface of the wall. A homogeneous uniform structure without pores is provided at the outer surface. A thickness of the wall lies in a range of 25 to 100 micrometers. The membrane has permeability for nitrogen of 25 ml per square centimeter minute bar, and has breaking strain that amounts to 250 percent. The membrane is made of vinyldene fluoride homopolymer or copolymer. An independent claim is also included for a method for producing a hollow fiber membrane.