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US 2026/0184857 A1Published application
Crosslinked copolymer, polymer membrane comprising same, and anion exchange membrane comprising same polymer membrane
AssigneeHanwha Solutions Corporation
InventorsTae-Hyun KIM, Kyungwhan MIN, Jiyong CHOI, Yerim LEE
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Abstract
A crosslinked copolymer is disclosed. The crosslinked copolymer has outstanding ion exchange capacity, exhibits high ion conductivity and water content under diverse temperature conditions, and features high density, low hydrogen permeability, and excellent thermal and oxidative stability, making it well-suited as an anion exchange membrane for water electrolysis to produce high-purity hydrogen and oxygen.
Claims14
1:
- A crosslinked copolymer comprising a first chain, represented by the following Chemical Formula 1, and a second chain, represented by the following Chemical Formula 2, wherein the first chain and second chain are crosslinked with each other:
- in Chemical Formula 1,
- * represents the bonding position with Chemical Formula 2,
- a sum of q1, q2, q5, and q6 is an integer of 100 to 1,000,
- a sum of q3 and q4 is an integer of 150 to 2,000,
- a and b are each independently an integer of 3 to 10,
- R1 to R4 are each independently hydrogen or —(CH2)p—CH3, where p is an integer of 0 to 5;
- in Chemical Formula 2,
- * represents the bonding position with Chemical Formula 1,
- n and m are each independently an integer of 10 to 50.
7 more elements
2:
- The crosslinked copolymer of claim 1,
- wherein 10 to 70 mol of the second chain is included based on 100 mol of the first chain.
3:
- The crosslinked copolymer of claim 1,
- wherein q1 to q6 are each independently an integer of 10 to 500.
4:
- The crosslinked copolymer of claim 1,
- wherein a ratio of the sum of q1, q2, q5, and q6 to the total sum of q1 to q6 is 0.2 to 0.5.
5:
- The crosslinked copolymer of claim 1,
- wherein a ratio of the sum of q1 and q6 to the total sum of q1, q2, q5, and q6 is 0.2 to 0.5.
6:
- The crosslinked copolymer of claim 1,
- wherein a and b are each independently an integer of 4 to 6.
7:
- The crosslinked copolymer of claim 1,
- wherein a ratio of n to (n+m) is 0.15 to 0.70.
8:
- The crosslinked copolymer of claim 1,
- wherein the crosslinked copolymer is represented by the following Chemical Formula 3:
- in Chemical Formula 3, q1 to q6, a, b, n, and m are as defined in Chemical Formulae 1 and 2.
9:
- A polymer membrane comprising the crosslinked copolymer of claim 1.
10:
- An anion exchange membrane for water electrolysis, comprising the polymer membrane of claim 9.
11:
- A method for preparing a crosslinked copolymer, comprising:
- (a) preparing a poly(styrene-b-ethylene-co-butylene-b-styrene) polymer represented by Chemical Formula 1-1 below,
- (b) preparing a polyphenylene oxide-based polymer represented by Chemical Formula 2-1 below, and
- (c) crosslinking the poly(styrene-b-ethylene-co-butylene-b-styrene) polymer and the polyphenylene oxide-based polymer to produce the crosslinked copolymer:
- in Chemical Formula 1-1,
- a sum of q1, q2, q5, and q6 is an integer of 100 to 1,000,
- a sum of q3 and q4 is an integer of 150 to 2,000,
- a and b are each independently an integer of 3 to 10,
- R1 to R4 are each independently hydrogen or —(CH2)p—CH3 (p is an integer of 0 to 5), and
- X1 and X2 are each independently a halogen group;
- in Chemical Formula 2-1,
- n and m are each independently an integer of 10 to 50.
9 more elements
12:
- The method of preparing a crosslinked copolymer of claim 11,
- further comprising (d) reacting the crosslinked copolymer with trimethylamine.
13:
- The method of preparing a crosslinked copolymer of claim 11,
- wherein the poly(styrene-b-ethylene-co-butylene-b-styrene) polymer comprises 30 to 90 mol of halogen atom based on 100 mol of styrene repeat units.
14:
- The method of preparing a crosslinked copolymer of claim 11,
- wherein in step (c), the polyphenylene oxide-based polymer is used at 10 to 70 mol based on 100 mol of halogen groups contained in the poly(styrene-b-ethylene-co-butylene-b-styrene) polymer.