Crosslinked Copolymer Film for Anionic Exchange
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Solution Overview
Problem
Current anionic exchange films lack high ionic conductivity and mechanical strength, limiting their application in water treatment systems when used alongside cationic exchange films.
Innovation Solution
A crosslinked copolymer film is developed, comprising styrene-based, conjugated double bonds or acrylate ester, and ammonium-containing heterocyclic monomers, with a controlled ionic segment ratio and crosslinking agent ratio to achieve enhanced mechanical strength and low resistivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional anionic exchange films are used, then the film can be manufactured with basic functionality, but the ionic conductivity is obviously lower compared to cationic exchange films
Solution Approach 1:
The patent employs a composite polymer structure combining polyacrylonitrile segments (for ionic conductivity) with crosslinking agents (for mechanical strength). This composite approach allows the film to achieve both high ionic conductivity and structural integrity, resolving the contradiction between functionality and manufacturability.
Solution Approach 2:
The patent optimizes the crosslinking degree and ionic segment concentration as key parameters. By controlling the crosslinking agent ratio and polymerization conditions, the film achieves balanced ionic conductivity and mechanical properties, enabling both high performance and manufacturability.
2Strength
If the crosslinking agent ratio is increased to improve mechanical strength, then the film strength increases, but the ionic conductivity may be reduced
Solution Approach 1:
The patent creates localized ionic channels within the crosslinked matrix by maintaining specific polyacrylonitrile segments uncrosslinked. This local quality differentiation allows dense crosslinking for strength while preserving ionic pathways for conductivity, resolving the contradiction between mechanical strength and ionic conductivity.
Solution Approach 2:
The patent applies partial crosslinking rather than complete crosslinking, maintaining optimal crosslinking density (5-20%) that provides sufficient mechanical strength while leaving enough ionic segments intact to maintain high ionic conductivity, thus avoiding the trade-off.
3Reliability
If the film thickness is reduced to improve ion transport efficiency, then the ionic conductivity increases, but the mechanical strength decreases
Solution Approach 1:
The patent successfully manufactures thin films (15-200 micrometers) with enhanced mechanical strength through optimized crosslinking. The crosslinked network provides structural support that prevents film rupture even at thin dimensions, enabling both high ionic conductivity and adequate mechanical strength simultaneously.
4Reliability
If conventional anionic exchange films are used, then the basic water treatment function is provided, but the chemical stability and lifespan are insufficient
Solution Approach 1:
The patent optimizes the crosslinking degree and polymer composition to enhance chemical stability. The crosslinked network structure resists chemical degradation and swelling, significantly improving the film's lifespan and durability in water treatment applications while maintaining functional performance.
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 crosslinked copolymer film exhibits improved ionic conductivity, mechanical strength, and chemical stability, enabling effective water treatment and recycling with reduced system costs.
Implementation Method 1
the crosslinked copolymer film exhibits improved ionic conductivity
Implementation Method 2
a crosslinked copolymer comprising a copolymer crosslinked by a crosslinking agent
Data Source
AI summary
A crosslinked copolymer is provided, which includes a copolymer crosslinked by a crosslinking agent. The copolymer is copolymerized of (a) styrene-based monomer, (b) monomer having conjugated double bonds or acrylate ester monomer, and (c) ammonium-containing heterocyclic monomer. The crosslinking agent is (d)or the product of the reaction betweenand (e)or a combination thereof. Z iswherein each R1 is independently H or C1-4 alkyl group, each R2 is independently H or C1-4 alkyl group, R3 is single bond, —O—, —S—, —CH2—, or —NH—. n is a positive integer. x is 1 to 12, y is 1 to 5, and z is 1 to 5.