Halogen-Modified Polymer Electrolyte Membrane for Adhesion and Strength
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Solution Overview
Problem
Existing polymer electrolyte membranes face issues with low mechanical strength and adhesion 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 is improved, but adhesion between substrate and polymer electrolyte deteriorates
Solution Approach 1:
The substrate surface is modified with hydrophilic groups at the interface region to improve adhesion, while the bulk substrate maintains its hydrophobic properties for mechanical strength. This local differentiation resolves the contradiction between adhesion and mechanical strength.
Solution Approach 2:
The substrate is designed as a composite structure combining hydrophobic materials (for mechanical strength) and hydrophilic components (for adhesion). This composite approach allows simultaneous achievement of both mechanical strength and adhesion requirements.
2Reliability
If the polymer electrolyte is impregnated into the porous substrate, then adhesion is improved, but random separation and peeling occur due to low mutual affinity
Solution Approach 1:
The chemical parameters of the substrate surface are modified by introducing hydrophilic groups, changing the surface energy and wettability parameters. This enables better compatibility and adhesion between the substrate and polymer electrolyte, preventing random separation and peeling.
3Strength
If the thickness of the membrane is increased to compensate for reduced mechanical strength, then mechanical strength is improved, but ionic conductivity deteriorates
Solution Approach 1:
The substrate provides mechanical strength support while the polymer electrolyte layer maintains ionic conductivity. This functional differentiation allows thin membrane design with both adequate mechanical strength and high ionic conductivity.
4Strength
If hydrophobic materials are introduced to supplement mechanical strength, then mechanical strength is improved, but resistance increases due to reduced ion transport
Solution Approach 1:
The substrate serves as a mechanical support framework with hydrophobic materials, while the polymer electrolyte phase provides ion transport pathways. This spatial separation of functions resolves the contradiction between mechanical strength and resistance.
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, maintaining mechanical strength and electrochemical performance by balancing the affinity between the substrate and polymer electrolyte.
Implementation Method 1
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.