Fluoropolymer Hybrid Membrane Processing Without Solvent Casting
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Solution Overview
Problem
Existing methods for manufacturing fluoropolymer hybrid membranes face challenges in achievingling high conductivity and homogeneity, particularly when using solvent casting techniques, which are environmentally solvent and industrially undesirable.
Innovation Solution
A process for manufacturing a polymer electrolyte membrane based on a fluoropolymer hybrid composite, which involves mixing a metal compound with a fluoropolymer and an electrolyte solution, and processing the solid state, so as to obtain a polymer electrolyte membrane comprising a fluoropolymer hybrid organic/inorganic composite, without solvent casting, ensuring high conductivity and homogeneity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If solvent casting technique is used to manufacture fluoropolymer hybrid membranes, then the manufacturing process is simple and easy to operate, but the environmental harm increases due to use of organic solvents and the manufacturing precision decreases due to poor atomic homogeneity
Solution Approach 1:
The patent changes the physical-chemical parameters of the manufacturing process by eliminating organic solvents and using aqueous environments instead. This transforms the process from solvent-based to water-based, achieving both environmental sustainability and improved atomic homogeneity through controlled hydrolysis and polycondensation reactions.
Solution Approach 2:
The patent discards harmful organic solvents (NMP, DMA) from the manufacturing process and replaces them with environmentally benign alternatives. The process recycles water and produces no harmful waste, thereby eliminating the need for solvent recovery and disposal operations.
2Ease of manufacture
If solvent casting technique is used to manufacture fluoropolymer hybrid membranes, then the manufacturing process is simple, but the manufacturing precision decreases due to poor atomic homogeneity
Solution Approach 1:
The patent applies preliminary action by pre-hydrolyzing the metal alkoxide before mixing with the fluoropolymer solution. This pre-treatment ensures uniform distribution of hydroxyl groups throughout the matrix, which then react uniformly during the polycondensation stage, achieving superior atomic homogeneity in the final hybrid material.
Solution Approach 2:
The patent employs continuous hydrolysis and polycondensation reactions under controlled conditions, ensuring uniform progression throughout the entire batch. This continuous action prevents localized variations in composition and maintains consistent atomic homogeneity throughout the membrane structure.
3Strength
If metal alkoxide hydrolysis and polycondensation are controlled to create hybrid composites, then the mechanical properties and surface characteristics are improved, but the process complexity increases
Solution Approach 1:
The patent optimizes key parameters including water-to-alkoxide ratio, reaction temperature, and pH control to achieve complete hydrolysis and controlled polycondensation. By carefully adjusting these parameters, the process achieves high mechanical strength and surface hardness while maintaining operational simplicity through a single-step sol-gel process.
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 process results in a polymer electrolyte membrane with high ionic conductivity and atomic homogeneity, avoiding the use of environmentally harmful solvents and ensuring predictable ion transport pathways.
Implementation Method 1
partially hydrolysing and/or polycondensing a mixture comprising a fluoropolymer, a metal compound of formula X 4-m AY m
Implementation Method 2
partially hydrolysing and/or polycondensing a mixture comprising a fluoropolymer, a metal compound of formula X 4-m AY m
Data Source
AI summary
The invention pertains to a process for the manufacture of a polymer electrolyte membrane based on a fluoropolymer hybrid organic/inorganic composite, to a polymer electrolyte obtained thereof and to uses of said polymer electrolyte and membranes obtained therefrom in various applications, especially in electrochemical and in photo-electrochemical applications.