Tröger's Base Poly(Crown Ether) Membranes
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current proton exchange membranes (PEMs) for fuel cells lack innovative materials with high proton conductivity, thermal stability, and water uptake capacity, limiting their efficiency and durability.
Innovation Solution
Development of double-strand chain compositions comprising dibenzo-crown ether macrocycles fused with bicyclic aliphatic linkers, which are cyclopolymerized to form robust, hydrophilic polymers capable of forming proton conductive membranes with high water uptake and thermal stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional PEM materials (Nafion, sulfonated polyaromatics, polyimides) are used, then proton exchange membrane functionality is achieved, but proton conductivity, thermal stability, and water uptake capacity are insufficient
Solution Approach 1:
The patent employs composite materials by combining dibenzo-crown ether macrocycles with bicyclic aliphatic linkers to create a novel polymer structure. This composite approach integrates the proton-conducting capability of crown ethers with the structural stability of bicyclic linkers, achieving both high proton conductivity and enhanced water uptake capacity simultaneously
Solution Approach 2:
The patent utilizes parameter changes by varying the crown ether ring size (different n values) and linker structures to optimize the balance between proton conductivity and water uptake. By adjusting these molecular parameters, the membrane achieves optimal performance in both proton transport and water retention
2Stability of the object's composition
If conventional PEM materials are used, then membrane structure is established, but thermal stability above 200°C is not achieved
Solution Approach 1:
The patent applies segmentation by dividing the polymer structure into distinct functional segments: dibenzo-crown ether macrocycle units for proton conduction and bicyclic aliphatic linker units for structural stability. This segmented architecture allows each component to contribute its specialized function, achieving thermal stability above 200°C while maintaining manageable structural complexity through modular design
3Quantity of substance
If high water uptake capacity is achieved, then proton conductivity is enhanced, but membrane structural integrity may be compromised
Solution Approach 1:
The patent applies local quality by creating hydrophilic regions with high water uptake capacity through the crown ether macrocycles, while the bicyclic aliphatic linkers provide hydrophobic, structurally robust regions. This local differentiation allows the membrane to achieve 23 wt% water uptake while maintaining structural integrity through the reinforcing effect of the rigid linker segments
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 resulting membranes exhibit proton conductivity of at least 1.0×10−8 S cm−1, thermal stability up to 200°C, and 23 wt% water uptake, enhancing fuel cell performance and durability.
Implementation Method 1
The double-strand chains comprise a plurality of constitutional units joined to each other through two atoms on one side of the constitutional unit and two atoms on the other side of the constitutional unit. Constitutional units comprise a dibenzo-crown ether macrocycle fused with a bicyclic aliphatic linker.
Implementation Method 2
the polymer has a water uptake capacity of at least 10 wt % at 90% relative humidity
Implementation Method 3
the membrane is proton conductive; capable of binding ions or small molecules
Data Source
AI summary
Described herein are double-strand chain compositions suitable for use in the preparation of proton conductive membranes. The double-strand chains comprise a plurality of constitutional units joined to each other through two atoms on one side of the constitutional unit and two atoms on the other side of the constitutional unit. Constitutional units comprise a dibenzo-crown ether macrocycle fused with a bicyclic aliphatic linker. Polymers, membranes, and fuel cells comprising the double-strand chain are also described herein.