Crosslinked Anion-Exchange Membrane for Low Resistance and Acid Stability
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Solution Overview
Problem
Existing anion-exchange membranes face challenges with high sheet resistance, limited ion exchange capacity, and poor chemical resistance, especially in the presence of highly concentrated acids and alkalines.
Innovation Solution
The development of an anion-exchange membrane featuring a porous polymer support with a crosslinked anion-exchange polymer uniformly distributed on its surface and within its pores, utilizing a crosslinkable monomer represented by Formula 1, which enhances ion exchange capacity and chemical resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If hydrocarbon-based anion-exchange membranes are used to reduce cost, then manufacturing cost is reduced, but chemical resistance deteriorates
Solution Approach 1:
The patent uses a composite structure combining a porous polymer support (hydrocarbon-based for cost efficiency) with a perfluorinated anion-exchange polymer coating (for superior chemical resistance). This composite approach allows the membrane to achieve both low cost and high chemical resistance by assigning different functions to different material components.
2Reliability
If perfluorinated anion-exchange membranes are used to improve chemical resistance, then chemical resistance is improved, but manufacturing cost increases
Solution Approach 1:
The patent applies perfluorinated anion-exchange polymer only where it is most needed - on the surface and within the pores of the porous support - rather than using it throughout the entire membrane structure. This local application provides maximum chemical resistance at minimum cost, as the expensive perfluorinated material is concentrated in the regions that require it most.
Solution Approach 2:
The patent utilizes a porous polymer support structure that allows the perfluorinated anion-exchange polymer to be distributed throughout the pore network. This porous structure increases the surface area and volume available for ion exchange while maintaining cost efficiency through the use of a hydrocarbon-based support material.
3Quantity of substance
If ion exchange capacity is increased to enhance membrane properties, then ion exchange capacity is improved, but sheet resistance increases
Solution Approach 1:
The patent employs a porous polymer support with optimized pore structure that allows high ion exchange capacity through increased surface area and pore volume, while the porous structure itself provides conductive pathways that maintain low sheet resistance. The porosity enables better ion transport without requiring excessive ion exchange groups.
Solution Approach 2:
The composite structure of porous support combined with perfluorinated anion-exchange polymer creates synergistic effects where the porous framework provides structural integrity and ion transport pathways, while the perfluorinated polymer provides high ion exchange capacity with good electrical conductivity, achieving both high IEC and low sheet resistance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The anion-exchange membrane achieves low sheet resistance, high ion exchange capacity, and excellent chemical resistance, enabling its use in systems with highly concentrated acids and alkalines.
Implementation Method 1
irradiating light onto the laminate and subjecting the composition to a crosslinking reaction to form, on the surface and in the pores of the porous polymer support, an anion-exchange polymer that is a crosslinked product of the composition
Implementation Method 2
an anion-exchange membrane is a synthetic resin membrane that selectively transmits anions by virtue of positively charged functional groups
Data Source
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AI summary
Disclosed are an anion-exchange membrane and a manufacturing method therefor. The anion-exchange membrane may include: a porous polymer support composed of a membrane structure; and an anion-exchange polymer, wherein the anion-exchange polymer may be present on a surface and in pores of the porous polymer support, anion-exchange groups of the anion-exchange polymer may be uniformly distributed on the surface and in the pores of the porous polymer support, and the anion-exchange polymer may be a crosslinked product of a composition including a crosslinkable monomer represented by Formula 1: wherein X- is as disclosed in the specification.