Anion Exchange Membrane Resin Composition for Strength and Flexibility
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Solution Overview
Problem
Existing anion exchange membranes have high rigidity and poor flexibility, leading to inadequate tensile strength and elongation at break.
Innovation Solution
A nitrogen-containing compound is synthesized with specific structural units, including segments I, II, III, and IV, which are polymerized and quaternized to form an anionic resin, enhancing the flexibility of the anion exchange membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional anionic resins with polyphenylene ether, poly (arylene ether), polysulfone, or polybenzimidazole backbones are used, then ion conductivity is achieved, but the membrane exhibits high rigidity and poor flexibility with inadequate tensile strength and elongation at break
Solution Approach 1:
The patent changes the chemical structure parameters of the polymer backbone by introducing flexible alkyl chains (with a = 1-10) and cyclic structures (R1 and R2 forming poly-membered rings with nitrogen). These structural parameter changes transform the rigid conventional backbones into flexible structures, improving both tensile strength and elongation at break while maintaining ion conductivity
Solution Approach 2:
The patent creates a composite molecular structure combining aromatic rings (for structural stability and ion conductivity) with flexible aliphatic chains and cyclic nitrogen-containing structures (for flexibility and toughness). This composite approach at the molecular level achieves both strength and flexibility simultaneously
2Reliability
If conventional anionic resins are used, then ion conductive function is provided, but film formation is difficult
Solution Approach 1:
The patent modifies the polymer chain parameters by incorporating flexible spacers (methylene groups with a = 1-10) between the aromatic rigid units and ionic groups. This increases chain mobility and flexibility, enabling better film formation while preserving the ion conductive pathways through the aromatic segments
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 resulting anion exchange membrane exhibits improved tensile strength and elongation at break, optimizing electrode interface contact in electrolyzers.
Implementation Method 1
adding an organic acid catalyst into the reaction base liquid, so that the aromatic monomer and nitrogen-containing aminoacetal monomers in the reaction base liquid polymerize under the action of the organic acid catalyst
Implementation Method 2
a method for preparing an anionic resin by subjecting a nitrogen-containing compound as described above and a quaternizing agent to quaterisation reaction
Data Source
AI summary
The present disclosure provide a nitrogen-containing compound, which includes a segment I with a formula of wherein a represents number of methylene groups, a is a positive integer, Ar1 is an aryl structural unit, and R1 and R2 are each independently selected from H, a hydrocarbyl group, or a substituted hydrocarbyl group, or, R1 and R2 are connected and form a poly-membered ring together with a N atom to which they are connected.