Cross-linked anion exchange membrane

Abstract

This invention provides a cross-linked anion exchange membrane. The cross-linked anion exchange membrane comprises cross-linked molecules and an organic polymer cross-linked with the cross-linked molecules, wherein the cross-linked molecules have a specific bisimidazole onium structure. Therefore, this cross-linked anion exchange membrane can exhibit high alkali stability, dimensional stability, and ionic conductivity, thereby improving its applicability.

Claims

1. A cross-linked anion exchange membrane, comprising: a cross-linked molecule, wherein the cross-linked molecule comprises the structure shown in formula (I): (I) In formula (I), X represents bromine, chlorine or iodine atom respectively; Y represents alkyl groups having 1 to 8 carbon atoms or divalent organic groups having 4 to 8 carbon atoms and having an ether group respectively; Z represents alkyl groups having 4 to 8 carbon atoms or divalent organic groups having an ether group respectively; R represents methyl or ethyl respectively; and n is any integer between 1 and 4; and an organic polymer, wherein the organic polymer is crosslinked with the crosslinked molecule, and the organic polymer comprises polybenzimidazole, polybenzoxazole, polybenzothiazole, polyetherketone, polyether sulfide, polyphenylene sulfide, polyethylene, polypropylene, polyvinyl chloride, polystyrene, polyphenylene chloride, branched polybenzimidazole, branched polybenzoxazole, branched polybenzothiazole, branched polyetherketone, branched polyether sulfide, branched polyphenylene sulfide or any combination thereof.

2. The cross-linked anion exchange membrane as claimed in claim 1, wherein the cross-linked molecules comprise at least one of the following: (The rest of the text appears to be a list of molecules and their components, which is not translated as it's not part of the main text.) 、 ...

3. The cross-linked anion exchange membrane as claimed in claim 1, wherein the polybenzimidazole has the structure shown in formula (II) as follows: (II) In formula (II), A represents a divalent organic group, and o represents any integer between 90 and 500.

4. The cross-linked anion exchange membrane as claimed in claim 1, wherein the branched polybenzimidazole has the structure shown in formula (III) as follows: (III) In formula (III), A represents a divalent organic group, B represents -(CH2)2- or -CH2-O-CH2-, C represents a tertiary amine group, r represents any integer between 0 and 2, p represents any integer between 1 and 50, and q represents an integer of (100-p).

5. The cross-linked anion exchange membrane as claimed in claim 1, wherein the polystyrene comprises the structure shown in formula (IV): (IV) In formula (IV), s represents any integer between 5 and 9, and t represents an integer of (10-s).

6. The cross-linked anion exchange membrane as described in claim 1, wherein the alkaline stability of the cross-linked anion exchange membrane is not less than 80%.

7. The cross-linked anion exchange membrane as claimed in claim 1, wherein the thickness of the cross-linked anion exchange membrane is from 20 micrometers to 100 micrometers.

8. The cross-linked anion exchange membrane as claimed in claim 1, wherein the ion exchange capacity of the cross-linked anion exchange membrane is from 1.5 mmole / g to 2.2 mmol / g.

9. The cross-linked anion exchange membrane as claimed in claim 1, wherein the cross-linked anion exchange membrane has a hydroxide ion conductivity of not less than 0.030 S / cm at 30°C and a hydroxide ion conductivity of not less than 0.072 S / cm at 80°C.

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