Mesoscale Simulation Based on the Dynamic Mean-Field Density Functional Method on Block-Copolymeric Ionomers for
Hoseong Kang1, Muyeong Cheon1, Chang Hyun Lee2
1Department of Energy Engineering, Future Convergence Technology Research Institute, Gyeongsang National University (GNU), Jinju 52725, Republic of Korea.
Membranes
|March 29, 2023
Summary
High sulfonation degree in block copolymers enhances phase separation and water channel formation for proton exchange membrane fuel cells (PEMFCs). This is crucial for efficient proton pathways in membranes.
Area of Science:
- Polymer Science
- Materials Science
- Electrochemistry
Background:
- Block copolymers exhibit unique phase separation properties.
- They are utilized in proton exchange membrane fuel cells (PEMFCs) for creating hydrophilic pathways.
- Classical molecular dynamics has limitations in simulating polymer electrolyte membrane (PEM) morphology.
Purpose of the Study:
- Investigate the morphology of sulfonated block copolymers for PEM applications.
- Understand the relationship between chemical structure, properties, and water channel formation.
- Explore mesoscale simulation methods for larger systems.
Main Methods:
- Employed dynamic mean-field density functional theory (DMFT-DFT) for mesoscale simulations.
- Modeled 3D structures of sulfonated block copolymers.
- Compared morphologies of models with varying sulfonation degrees.
Main Results:
- Achieved distinct morphologies despite similar monomer solubility parameters.
- A model with higher sulfonation degree (twice that of the other) showed enhanced phase separation and water channel formation.
- Water molecules played a key role in equilibrating mesoscale models and promoting phase separation.
Conclusions:
- Higher sulfonation degree in monomers is more effective for PEM morphology than a longer hydrophilic block with lower sulfonation.
- Mesoscale simulations, considering water's role, are vital for designing efficient PEMs.
- Optimizing sulfonation is key for well-defined hydrophilic regions and water channels in PEMFCs.
Keywords:
block copolymersmesoscale simulationphase separationproton exchange membranes (PEMs)water channelMore Related Videos
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