Ionic Organosilane Membranes for Tough Anion Exchange Films
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Solution Overview
Problem
Existing anion exchange membranes used in electrochemical cells suffer from inadequate mechanical strength, brittleness, and low tensile strength, which limits their effectiveness in applications such as fuel cells and electrolyzers.
Innovation Solution
Incorporating ionic organosilanes into membrane polymers, specifically through the use of dihaloorganosilanes and ionic organosilanes, to enhance membrane elongation and toughness while maintaining conductivity and chemical stability under alkaline conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional copolymers with cationic groups are used to create anion exchange membranes, then the membranes can conduct ions, but the mechanical strength is inadequate and the membranes become brittle
Solution Approach 1:
The patent creates a composite membrane system by incorporating ionic organosilane compounds into the polymer matrix. The organosilane acts as a reinforcing filler that provides mechanical strength while the ionic groups maintain conductivity. This composite approach allows simultaneous achievement of both ionic conductivity and mechanical strength.
Solution Approach 2:
The patent modifies the physical and chemical parameters of the membrane by controlling the amount, size, and distribution of organosilane particles. By optimizing these parameters, the membrane achieves improved mechanical properties without sacrificing ionic conductivity. The particle size and concentration are carefully controlled to balance reinforcement and ion transport.
2Strength
If impact modifiers such as silicone are added to toughen the membrane, then elongation and toughness improve, but conductivity per unit volume decreases due to occupied volume
Solution Approach 1:
The ionic organosilane compounds serve multiple functions simultaneously: they act as impact modifiers to improve toughness, provide ionic groups for conductivity, and serve as reinforcing fillers for mechanical strength. This multi-functionality eliminates the need for separate additives that would occupy volume and reduce conductivity.
Solution Approach 2:
The patent merges the functions of impact modification and ionic conduction into a single compound. The organosilane structure combines the toughening effect of silicone with ionic groups, creating a material that provides both mechanical improvement and electrical function without the trade-off of volume occupation.
3Reliability
If traditional membranes are used to ensure chemical stability, then reliability is maintained, but mechanical strength and elongation are insufficient
Solution Approach 1:
The patent creates a composite where ionic organosilane compounds are dispersed in the polymer matrix. The organosilane particles provide mechanical reinforcement through their rigid structure and strong interfacial bonding, while the polymer matrix maintains chemical stability. The composite structure allows both properties to coexist.
Solution Approach 2:
The organosilane compounds are distributed throughout the membrane matrix, providing localized reinforcement at critical stress points. This local quality enhancement improves overall mechanical strength and tensile properties while the bulk polymer matrix maintains its chemical stability and ionic conductivity.
Data Source
AI summary
A dihaloorganosilane is represented by the formula (I): Each X independently represents C1, Br, or I. Each Ar1 independently represents a phenylene group optionally substituted by 1 to 4 alkyl groups selected from methyl or ethyl. Each R1 independently represents an alkylene group having from 2 to 18 carbon atoms. Each R2 independently represents methyl or ethyl. Each R3 independently represents an alkylene group having from 1 to 18 carbon atoms. Each R4 independently represents an alkylene group having from 2 to 18 carbon atoms, and n is an integer in a range of 0 to 5, inclusive. Ionic organosilanes preparable from the dihaloorganosilanes are represented by the formula (II): Membrane compositions and membranes containing the ionic organosilanes are also disclosed.