Preparation of highly asymmetric hollow fiber membranes from poly(ether imide) by a modified dry–wet phase inversion technique using a triple spinneret (original) (raw)

Polymeric membranes have been well established in many separation processes since the introduction of a preparation technique generating asymmetric morphologies by Loeb and Sourirajan. If the separation layer of an asymmetric membrane is highly permeable, the support layer resistance can become significant. A highly asymmetric structure over the entire cross-section of a membrane is a prerequisite for the restriction of this resistance. With regard to hollow fiber membranes, a very open pore structure on the membrane surface opposite to the active layer is required.