Method of making single film, high performance bipolar membrane

Coating processes – Electrical product produced – Integrated circuit – printed circuit – or circuit board

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427340, 427385B, B05D 306

Patent

active

041408152

ABSTRACT:
Novel single film bipolar membranes, of substantially improved efficiency and durability, i.e. having an ion selectivity above 80% in an electrolyte medium of about one mole, are prepared from pre-swollen films containing a relatively high amount, i.e. at least 15% of an insoluble cross-linked aromatic polymer. Under controlled conditions, highly dissociable cationic-exchange groups are chemically bonded to the aromatic nuclei to a desired depth of the film from one side only; subsequently, highly dissociable anion-exchange groups are chemically bonded to the unreacted aromatic nuclei on the other side of the film. The functionalized, densely structured single film ion exchange membrane undergoes negligible degradation, is blister free, and is uniquely suited for electrodialysis particularly water-splitting operations due to its low electrical resistance and low salt leakage. The membrane operates with improved current efficiencies at both high electrolyte concentrations and high current densities, for time periods not previously achievable.

REFERENCES:
patent: 3247133 (1966-04-01), Chen
patent: 3562139 (1971-02-01), Leitz
patent: 3945927 (1976-03-01), Imai et al.

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