Reinforced Anion Exchange Membranes via Extruded Polymer Blends
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Solution Overview
Problem
Existing methods for producing anion exchange membranes are inefficient and costly, particularly in achieving robust and large-scale membranes for electrochemical applications.
Innovation Solution
A method involving compounding a halide-functionalized polymer with thermoplastic and copolymer polymers, followed by extrusion, cross-linking, and functionalization to produce reinforced anion exchange membranes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If existing methods are used to produce anion exchange membranes, then membrane production is achieved, but the process is inefficient and costly with poor mechanical properties
Solution Approach 1:
The patent employs composite materials by combining halide-functionalized polymer (for ion-exchange functionality) with thermoplastic polymer (for mechanical reinforcement) and copolymer (for compounding enhancement). This composite approach enables simultaneous achievement of ion-exchange capability, mechanical robustness, and manufacturing efficiency, resolving the contradiction between membrane functionality and ease of manufacture
Solution Approach 2:
The patent utilizes parameter changes by controlling the degree of cross-linking, halogen content, and polymer composition ratios during processing. These parameter adjustments optimize both the ion-exchange capacity and mechanical properties while maintaining production efficiency, addressing the contradiction between productivity and manufacturing quality
2Strength
If membrane reinforcement is achieved, then mechanical properties improve, but production complexity increases
Solution Approach 1:
The patent merges multiple functions into a single integrated process: the halide-functionalized polymer provides both ion-exchange functionality and participates in cross-linking for reinforcement; the thermoplastic polymer provides mechanical strength while being processable by extrusion. This merging eliminates separate reinforcement steps, improving strength without significantly increasing device complexity
Solution Approach 2:
The copolymer acts as an intermediary that enhances the compounding process between the halide-functionalized polymer and thermoplastic polymer. This intermediary component facilitates uniform distribution and bonding, achieving reinforcement while simplifying the overall fabrication process by preventing phase separation and processing issues
3Reliability
If halide-functionalized polymer is used for ion-exchange functionality, then anion-conducting capability is achieved, but processing difficulty increases due to reactivity
Solution Approach 1:
The patent applies preliminary action by pre-functionalizing the polymer with halide groups before membrane fabrication. This allows the ion-exchange functionality to be built into the polymer structure beforehand, ensuring reliable anion-conducting capability while enabling subsequent easy processing through extrusion and cross-linking, thus resolving the contradiction between functionality and ease of manufacture
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 method enables the production of robust, inexpensive, and large-scale reinforced anion exchange membranes with improved mechanical properties and ion-exchange functionality, suitable for various electrochemical devices.
Implementation Method 1
the functionalizing comprises a quaternization step comprising reacting halogen groups of the first polymer with tertiary amines to produce quaternary amine groups providing an ion-exchange functionality to the membrane
Implementation Method 2
cross-linking at least one of the polymers during the compounding and/or during the extrusion and/or after the extrusion
Implementation Method 3
extruding the blend pellets to form a blend film
Implementation Method 4
compounding a first polymer with at least one second polymer and at least one third polymer by heating, mixing and cooling
Data Source
AI summary
Methods of preparing reinforced anion exchange membranes are provided, as well as produced membranes and corresponding devices utilizing the membranes. Methods comprise compounding a halide-functionalized polymer (selected to react with amines to yield anion-conducting quaternary amine groups) with thermoplastic polymer(s) (selected to support and/or reinforce the membrane), and with copolymer(s) (selected to enhance the compounding of the polymers)—by heating, mixing and cooling—to form blend pellets, extruding the blend pellets to form a blend film, cross-linking polymer(s), and functionalizing the blend film to prepare the anion exchange membrane. Functionalization comprises a quaternization step comprising reacting halogen groups of the first polymer with tertiary amines to produce the quaternary amine groups with ion-exchange functionality. Reinforced anion exchange membranes are provided, which are produced by the disclosed methods, functionalized to yield a membrane for fuel cell(s), electrolyzer(s), reversible electrochemical device(s), desalination unit(s), etc.