Composite Membrane Segmentation for Ion Conductivity and Strength
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Solution Overview
Problem
Existing methods for preparing composite membranes with ion exchange resins suffer from low selective permeability and physical strength due to the difficulty in uniformly dispersing additives, leading to membrane splitting and limited incorporation of inorganic materials.
Innovation Solution
A composite membrane is developed with multiple polymer layers, including a first layer of ion transfer polymer and a second layer with functional additive particles such as silicon, graphite oxide, or metal oxide particles, where the second layer has a thickness of 60 µm to 150 µm and contains 30 wt% to 80 wt% functional additives, allowing for localized distribution and maximizing their effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additives are mixed with ion exchange resin solution to increase ion conductivity and selective permeability, then the ion conductivity and selective permeability are improved, but the membrane splits due to poor dispersion of additives
Solution Approach 1:
The membrane is divided into multiple layers: a first layer containing ion exchange resin and a second layer containing functional additives dispersed in a polymer matrix. This segmentation allows each layer to specialize - the first layer provides ion conductivity while the second layer provides mechanical strength and additive dispersion, resolving the contradiction between improving ion conductivity and maintaining membrane strength
Solution Approach 2:
A polymer matrix acts as an intermediary medium in the second layer to uniformly disperse functional additives. This intermediary prevents direct contact between incompatible additives and the ion exchange resin, enabling better dispersion and preventing membrane splitting while still allowing the additives to enhance ion conductivity and selective permeability
2Ease of manufacture
If a single layer membrane is formed with mixed additives, then the manufacturing process is simple, but the amount of inorganic materials that can be added is limited
Solution Approach 1:
By segmenting the membrane into two layers with different compositions, the patent enables incorporation of large amounts of inorganic functional additives in the second layer without compromising the structural integrity provided by the first layer. This resolves the limitation on inorganic material content while maintaining ease of manufacture through a systematic multi-layer formation process
Solution Approach 2:
The membrane uses a composite structure where the second layer combines organic polymer matrix with inorganic functional additives (such as metal oxides, silicates, or carbon-based materials). This composite approach allows high loading of inorganic materials (30-80 wt%) to achieve enhanced functionality while the overall membrane structure remains manufacturable
3Strength
If additives are not uniformly dispersed in the membrane, then the membrane structure remains intact, but the functional effectiveness of additives is reduced
Solution Approach 1:
The segmentation into two distinct layers ensures that functional additives are confined to the second layer where they can be uniformly dispersed in the polymer matrix without disrupting the overall membrane structure. This spatial separation achieves both uniform additive distribution and structural integrity simultaneously
Solution Approach 2:
The polymer matrix in the second layer serves as an intermediary that facilitates uniform dispersion of functional additives through compatible interactions. This intermediary medium ensures homogeneous distribution of additives at the molecular level, achieving high manufacturing precision in additive placement while maintaining membrane integrity
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
This approach prevents membrane splitting, allows for higher additive content, and enhances the membrane's functionality by ensuring the functional additives are evenly distributed and effective, improving durability and performance.
Implementation Method 1
ion exchange resins are used, and when a separation membrane is prepared by using only a polymer resin, the selective permeability of hydrogen ions is low
Implementation Method 2
additives are mixed and used to increase the ion conductivity and selective permeability of hydrogen
Data Source
Figure 1(a)~1(e)
Figure 2
Figure 3(a)~3(c)
AI summary
The present specification relates to a composite membrane containing an ion transfer polymer and a method for preparing the same.