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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Phase separation and water channel formation in sulfonated block copolyimide.

Chi Hoon Park¹, Chang Hyun Lee, Joon-Yong Sohn

¹School of Chemical Engineering, Hanyang University, Seoul 133-791, Korea.

The Journal of Physical Chemistry. B

|August 26, 2010

Summary

Proton exchange membranes (PEMs) show different microscopic structures impacting fuel cell performance. Weaker microphase separation in sulfonated block copolyimides (SPIs) impedes water channel formation, affecting proton conductivity.

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Area of Science:

Materials Science
Electrochemistry
Polymer Science

Background:

Proton exchange membranes (PEMs) are crucial for fuel cell efficiency.
Understanding the relationship between microscopic structure and macroscopic properties is key for PEM development.

Purpose of the Study:

To compare experimental and simulated data on phase separation and water channel formation in PEMs.
To investigate the influence of polymer structure on fuel cell performance.

Main Methods:

Utilized experimental and simulation techniques.
Studied sulfonated block copolyimides (SPIs) as model polymers and Nafion as a reference.
Analyzed microscopic structural differences (atoms, backbone rigidity, sulfonic acid group location).

Main Results:

SPIs exhibit weaker microphase separation compared to Nafion.
Lower mobility of sulfonic acid groups and hydrogen bonding in SPIs hinder water channel formation.
Microscopic structural variations significantly impact macroscopic properties like density, water uptake, and proton conductivity.

Conclusions:

Phase separation and water channel formation are critical factors governing PEM macroscopic properties.
Microscopic structural differences between SPIs and Nafion explain variations in water uptake and proton transport.
Tailoring polymer architecture is essential for optimizing PEMs for fuel cell applications.