Fluorinated Polymer Composition for High TQ and Ion Exchange Capacity
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Solution Overview
Problem
Existing methods fail to produce fluorosulfonyl group-containing polymers with high TQ values, which are precursors for sulfonic acid group-containing fluorinated polymers with high ion exchange capacity.
Innovation Solution
A method involving the polymerization of a specific monomer and tetrafluoroethylene at controlled temperatures between 110°C and 250°C, followed by conversion of fluorosulfonyl groups to sulfonic acid groups, achieving a TQ value of at least 220°C and ion exchange capacity of 1.81 to 2.50 milliequivalent/gram dry resin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional polymerization methods are used to produce fluorosulfonyl group-containing polymers, then the polymer can be obtained, but the TQ value (molecular weight index) remains low
Solution Approach 1:
The patent applies parameter changes by optimizing the polymerization temperature to a specific range (110-250°C) and controlling the monomer composition ratio to achieve high TQ values. This resolves the contradiction by finding the optimal parameter window that enables high molecular weight polymer formation without excessive process complexity
Solution Approach 2:
The patent uses local quality by incorporating specific fluorosulfonyl group-containing monomers at controlled ratios (1-50 mol%) into the polymer chain. This localized incorporation of functional groups allows high TQ values while maintaining manufacturability through precise compositional control
2Reliability
If the ion exchange capacity is increased to improve conductivity, then the power generation performance improves, but the TQ value of the precursor polymer decreases
Solution Approach 1:
The patent applies preliminary action by first synthesizing the fluorosulfonyl group-containing polymer with high TQ value, then converting the fluorosulfonyl groups to sulfonic acid groups in a subsequent step. This two-stage approach allows the molecular weight to be established before introducing the ion-exchange functionality, resolving the contradiction between high TQ and high ion exchange capacity
Solution Approach 2:
The patent segments the synthesis process into distinct stages: (1) polymerization to form high TQ fluorosulfonyl-containing polymer, and (2) conversion to sulfonic acid groups. This segmentation allows independent optimization of molecular weight and ion exchange capacity, achieving both high TQ (≥220°C) and high ion exchange capacity (1.81-2.50 milliequivalent/gram)
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 method enables the production of fluorosulfonyl group-containing polymers with high TQ values, leading to sulfonic acid group-containing polymers with enhanced ion exchange capacity, improving conductivity and power generation performance in polymer electrolyte fuel cells.
Implementation Method 1
polymerizing a monomer represented by the following formula m1 and tetrafluoroethylene at a temperature of at least 110° C. and at most 250° C.
Implementation Method 2
hydrolyzing the fluorosulfonyl groups of the fluorosulfonyl group-containing fluorinated polymer produced by the production method as defined in any one of [1] to [3] to form salt-type sulfonic acid groups
Data Source
AI summary
To provide a method for producing a polymer, whereby it is possible to obtain a sulfonic acid group-containing polymer having a high TQ value and a high ion exchange capacity. A method for producing a fluorosulfonyl group-containing fluorinated polymer, which comprises polymerizing a monomer represented by the following formula m1 and tetrafluoroethylene, at a temperature of at least 110° C. and at most 250° C.:in the above formula, RF1 and RF2 are each a C1-3 perfluoroalkylene group.