Polymer Electrolyte Membrane Structure for Adhesion and Impregnation
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Solution Overview
Problem
Existing polymer electrolyte membranes face issues with impregnability, adhesion, and physical properties due to low affinity between hydrophobic substrates and polymer electrolytes, leading to separation, peeling, and reduced electrochemical performance.
Innovation Solution
A polymer electrolyte membrane is developed with a porous substrate comprising a first polyolefin modified with a halogen-based compound and a second polyolefin, where the first part constitutes a discontinuous phase and the second part a continuous phase, with a controlled halogen-based compound content of 0.5 to 10 wt%, enhancing affinity and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a hydrophobic substrate is used to support the polymer electrolyte, then mechanical strength and swelling suppression are improved, but affinity between substrate and polymer electrolyte deteriorates
Solution Approach 1:
The substrate is designed with heterogeneous structure containing both hydrophobic regions (for mechanical strength) and hydrophilic regions (for polymer electrolyte affinity). Specifically, the substrate includes inorganic hydrophilic particles dispersed in a hydrophobic polymer matrix, creating local quality variations that simultaneously provide structural support and chemical affinity for the polymer electrolyte impregnation.
Solution Approach 2:
The substrate is constructed as a composite material combining hydrophobic polymer components (for mechanical strength) and hydrophilic inorganic particles (for affinity). This composite structure resolves the contradiction by integrating materials with complementary properties, where the hydrophobic polymer matrix provides structural integrity while the hydrophilic particle surfaces create anchoring sites for the polymer electrolyte.
2Strength
If polymer electrolyte is impregnated into porous substrate, then adhesion is improved, but impregnability deteriorates due to low affinity
Solution Approach 1:
The substrate surface and pore walls are designed with local hydrophilic regions (inorganic particles) that specifically attract and bind the polymer electrolyte, while maintaining overall porosity for impregnation. This local quality enhancement at interface regions facilitates both deep penetration during impregnation and strong adhesion after impregnation.
Solution Approach 2:
The hydrophilic inorganic particles act as intermediaries between the hydrophobic substrate matrix and the polar polymer electrolyte. These intermediate surfaces provide chemical compatibility and bonding sites that bridge the affinity gap, enabling effective impregnation and adhesion without requiring the entire substrate to be hydrophilic.
3Strength
If hydrophobic materials are introduced to supplement mechanical strength, then membrane strength is improved, but resistance increases and efficiency decreases
Solution Approach 1:
Mechanical strength is provided locally by the hydrophobic polymer matrix in regions where structural support is needed, while ion transport channels are maintained open and accessible through the porous structure filled with polymer electrolyte. This spatial separation of functions allows strength and low resistance to coexist without compromising either property.
Solution Approach 2:
The membrane is designed as a composite system where the hydrophobic polymer substrate provides mechanical strength and the impregnated polymer electrolyte provides ionic conductivity. This composite architecture allows each component to fulfill its primary function without interfering with the other, achieving both strength and low resistance simultaneously.
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 membrane exhibits improved impregnability, adhesion, and physical properties, ensuring balanced performance and stability, with enhanced ionic conductivity and mechanical strength.
Implementation Method 1
a first part including a first polyolefin modified with a halogen-based compound
Implementation Method 2
a halogen-based polymer electrolyte impregnated in pores of the porous substrate
Data Source
AI summary
One aspect of the present invention provides a polymer electrolyte membrane including: a porous substrate including a first part including a first polyolefin modified with a halogen-based compound, and a second part including a second polyolefin; and a halogen-based polymer electrolyte impregnated in pores of the porous substrate, wherein in the porous substrate, the first part and the second part constitute a discontinuous phase and a continuous phase, respectively, and a content of the halogen-based compound in the porous substrate is 0.5 to 10 wt%, and a method of manufacturing the same.