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US 11,286,357 B2Granted
Composite ion exchange membrane and method of making same
OwnerBamdad Bahar, Zhefei Liinventors
Life of this patent
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Abstract
An anion exchange membrane is made by mixing 2 trifluoroMethyl Ketone [nominal] (1.12 g, 4.53 mmol), 1 BiPhenyl (0.70 g, 4.53 mmol), methylene chloride (3.0 mL), trifluoromethanesulfonic acid (TFSA) (3.0 mL) to produce a pre-polymer. The pre-polymer is then functionalized to produce an anion exchange polymer. The pre-polymer may be functionalized with trimethylamine in solution with water. The pre-polymer may be imbibed into a porous scaffold material, such as expanded polytetrafluoroethylene to produce a composite anion exchange membrane.
Claims12
A method of making a composite ion exchange membrane comprising the steps of:
- a) providing a porous scaffold material having pores and selected from the group of porous polyolefin and porous fluoropolymer;
- b) preparing a pre-polymer by mixing:
- i) 2 trifluoromethyl ketone;
- ii) 1 biphenyl;
- iii) methylene chloride;
- and
- iv) trifluoromethanesulfonic acid,
- for a mixing time and temperature to produce said pre-polymer;
- c) providing a functional polymer selected from the group consisting of:
- hydroxide halide and oxyanions;
- d) surface modifying the porous scaffold material to produce a hydrophilic porous scaffold;
- e) imbibing the pre-polymer into the pores of said porous scaffold material and subsequently
- functionalizing the pre-polymer by contacting the pre-polymer with a trimethylamine solution to produce said composite ion exchange membrane having quaternized ammonium hydroxide functional groups, wherein the prepolymer is functionalized into to produce an ion exchange polymer.
10 more elements
Dependencies are inferred from the claim text.