POROUS MEMBRANES CONTAINING MODIFIED POLYACRYLONITRILE FOR ULTRAFILTRATION, PROCESS FOR PREPARING THE SAME, AND APPLICATIONS OF SAID MEMBRANES

摘要

P THE POLYACRYLONITRILE MEMBRANES MODIFIED ACCORDING TO THE INVENTION ARE PREPARED BY REACTING THE POLYACROLONITRILE OR COPOLYMERS OF ACRYLONITRILE AND OTHER ETHYLENICALLY UNSATURATED MONOMERS WITH, SUCCESSIVELY, HYDROXYLAMINE, AT LEAST OF THE DIFUNCTIONAL COMPOUNDS THAT ACT AS DECOUPLING ELEMENTS, FOR EXAMPLE CYANURIC CHLORIDE, A POLYFUNCTIONAL OLIGOMER OR POLYMER, FOR EXAMPLE POLYETHYLENEIMINE, AND FINALLY A REACTIVE COMPOUND CONTAINING AT LEAST 1 ION GROUP, FOR EXAMPLE ANIONIC REACTIVE AZOIC COLORANT. This last compound must be able to react with the oligomer or polyfunctional polymer and it is only necessary if said polymer does not already contain Ionic groups itself. AND GOOD STABILITY AT TEMPERATURE AND PH. / P