Fluorinated Ionomer Composite Membrane With Triazine Crosslinking
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Solution Overview
Problem
Current perfluorinated sulfonic acid proton exchange membranes in fuel cells face issues with mechanical strength, size stability, chemical stability, and high permeability, particularly at elevated temperatures, leading to reduced efficiency and durability.
Innovation Solution
A composite material is developed by grafting fluorine-containing polymer fibers with nitrile groups to form a triazine ring cross-linked structure with ion exchange resins, enhancing mechanical properties and ion exchange capacity while reducing gas permeability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If perfluorinated sulfonic acid membranes are used to achieve good proton conductivity and chemical stability at low temperature, then proton conductivity is improved, but mechanical strength and size stability deteriorate
Solution Approach 1:
The patent uses a composite structure combining perfluorinated sulfonic acid resin with porous PTFE substrate and fluorocarbon polymer coating. This composite material integrates the high proton conductivity of the resin with the mechanical strength and dimensional stability of the PTFE substrate, resolving the contradiction between conductivity and mechanical strength
2Reliability
If perfluorinated sulfonic acid membranes are used to achieve good proton conductivity at low temperature, then proton conductivity is improved, but size stability deteriorates
Solution Approach 1:
The composite structure with PTFE substrate provides dimensional stability while the ion exchange resin layer maintains proton conductivity. The fluorocarbon polymer coating further enhances chemical stability and prevents degradation, achieving both size stability and conductivity
Solution Approach 2:
The porous PTFE substrate provides a stable mechanical framework with controlled porosity that allows proton transport while maintaining size stability. The pore structure supports the ion exchange resin without compromising dimensional stability
3Reliability
If perfluorinated sulfonic acid membranes are used to achieve ion exchange function, then ion exchange capacity is improved, but gas permeability deteriorates
Solution Approach 1:
The porous PTFE substrate provides a controlled pore structure that allows selective transport. The porosity is optimized to permit ion exchange while preventing excessive gas permeability, achieving a balance between ion exchange capacity and gas barrier properties
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 composite material achieves improved mechanical strength, air tightness, and ion exchange capacity, maintaining high conductivity and stability even at elevated temperatures, thus enhancing the performance and longevity of fuel cells.
Implementation Method 1
at least one ion exchange resin comprises nitrile group which forms triazine ring cross-linked structure with the nitrile group of the grafted functional monomer
Implementation Method 2
a composite material which is composed of one or more ion exchange resins with ion exchange function
Data Source
AI summary
Provided is a composite which is comprised of one or more ion exchange resin(s) and fluorine containing polymer fiber, wherein the fiber and the film-forming resin form a triazine-ring crosslinked structure, so that the film prepared from the composite is of good airtightness and stability, as well as high ion exchange capacity and high conductivity. The preparation method of the composite, the product prepared from this composite and the use thereof are also provided.