Abstract: A modified polyvinyl chloride (PVC) separation membrane and a method for its preparation. The membrane has improved water permeability, contamination resistance, and hydrophilic properties. The method comprises contacting a PVC membrane with a treating solution containing a compound having an amino functional group, preferably in the presence of an alkali alcoholate catalyst, and heat-treating the PVC membrane at elevated temperature. The membrane can be dipped in the treating bath at high temperature or dipped in solution at room temperature and heat-treated after removal from the treating bath.

Abstract: A new process for preparing a separation membrane from aminated polysulfone resin or blends of aminated polysulfone-blended materials which utilizes an organic additive having a low or negligible water-solubility (instead of conventional water-soluble organics, polymers, or inorganic salts) in the casting solution. The resulting membrane exhibits high water-permeability and is capable of being formed at a high production rate when using a wet casting machine.