Phaseseparationbyliquidimmersion[5]

Phaseseparationbyliquidimmersion[5]isawell-known method for preparing porous membranes with controlled properties from various polymers. The use of this technique for obtaining PVDF membranes with different porosities and structures, these latter ranging from the so-called ‘finger-like’ structure to the ‘sponge-like’ one, is described [6,7]. PVDF, which is widely used for making ultrafiltration and microfil- tration membranes owing to its excellent chemical resistance and good thermal stability, has attracted in the recent years much attention as trunk material for the preparation of sepa- rators in lithium batteries [8].