MEMBRANE

摘要

A method of producing a tubular membrane in which a blend of an aromatic polyetherketone (PEEK) and an aromatic polyethersulphone (PES), the blend being selected in a defined weight range, is extruded into a tube in which the polymers are present in the tube wall as interpenetrating networks and leaching out with a solvent for PES the PES network so producing a porous PEEK tube characterised in that the PEEK and PES used comply with a defined melt viscosity relationship.