Battery separators containing sulfonamide groups

Abstract

Abstract Synthetic ion-exchange material is made in the form of sheets, films, rods, cylinders or tubes, characterized by the presence of positive and negative groups on common macromolecules and a combined acidic and alkaline capacity of at least 0.3 meq. per gram. The macromolecular material which forms the basis of the ion-exchange material is preferably polyethylene, but may also be composed of polymers of propylene, styrene, vinyl chloride, chlorotrifluoroethylene or tetrafluoroethylene, or of natural or synthetic rubber. In the examples polyethylene film is exposed to accelerated electrons, and placed in styrene, which grafts on to the irradiated film. The grafted styrene is successively chlorosulphonated, reacted with ethylene diamine or 3-diethylaminopropylamine, and hydrolyzed with sodium hydroxide to produce aromatic nuclei some of which bear acid groups and others of which bear basic groups. Tertiary amino groups in the polymer may be quaternized with methyl iodide.

Inventors

• 👤 Friedlander Henry Zuckert

Bibliographic Details