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Olefin Metathesis Polymerization: Overview

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

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Author Spotlight: Design and Evaluation of Au-Electroplated Carbon Fiber Cloth Electrodes for Hydrogen Peroxide Fuel Cells

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Controlled disulfonated poly(arylene ether sulfone) multiblock copolymers for direct methanol fuel cells.

Qing Li¹, Yu Chen, Jarrett R Rowlett

¹Materials Physics and Applications and ⊥Physical Chemistry & Applied Spectroscopy, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States.

ACS Applied Materials & Interfaces

|April 3, 2014

Summary

New multiblock copolymer membranes show promise for direct methanol fuel cells (DMFCs). Tailoring block size and chemistry improves mechanical strength and fuel/ion transport, potentially outperforming current standards like Nafion.

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Published on: October 10, 2016

Area of Science:

Polymer Science
Materials Science
Electrochemistry

Background:

Direct methanol fuel cells (DMFCs) require advanced membrane materials for efficient energy conversion.
Current membranes, like Nafion, face challenges in performance and cost.
Developing novel polymer electrolytes is crucial for next-generation fuel cell technology.

Purpose of the Study:

To investigate structure-property-performance relationships in novel disulfonated poly(arylene ether sulfone) multiblock copolymer membranes for DMFCs.
To synthesize and characterize various hydrophobic and hydrophilic block combinations.
To evaluate the impact of structural modifications on membrane properties and DMFC performance.

Main Methods:

Synthesis of polysulfone, polyketone, and polynitrile hydrophobic blocks with varying lengths and compositions.
Coupling reaction with disulfonated poly(arylene ether sulfone) hydrophilic blocks to form multiblock copolymers.
Characterization of membrane morphology, mechanical properties, water uptake, and ion/molecule transport.
DMFC performance testing and comparison with Nafion.

Main Results:

Increased block size led to enhanced morphological order, mechanical toughness, and controlled water/ion transport.
Chemical modifications of hydrophobic blocks (polar groups, fluorination, bisphenol type) allowed fine-tuning of membrane properties.
DMFC performance varied significantly with copolymer structure, with some candidates showing competitive results against Nafion.

Conclusions:

Disulfonated poly(arylene ether sulfone) multiblock copolymers offer tunable properties for DMFC applications.
Morphological and chemical structure are key determinants of membrane performance in DMFCs.
These novel copolymers represent a promising alternative to conventional DMFC membrane materials.