Sulfonated Polyphenylene Polymerization With Precise Sulfonation Control
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Solution Overview
Problem
Current methods for synthesizing sulfonated polyphenylene polymers face challenges such as irregular sulfonation, limited molecular weight due to solvent issues, and the use of toxic solvents like nitrobenzene, which complicates polymerization and recovery.
Innovation Solution
A method involving the polymerization of a sulfonated bis-cyclopentadienone with a diethynyl arene in one or more solvents, excluding nitrobenzene, to form sulfonated polyphenylene polymers with controlled molecular weight and precise sulfonation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If post-polymerization sulfonation is used to synthesize sulfonated polyphenylene polymers, then the polymer can be formed first and then sulfonated, but the sulfonation becomes irregular with varying extent and position across monomers, negatively impacting polymer characteristics and reproducibility
Solution Approach 1:
The patent applies preliminary action by performing sulfonation on the monomer before polymerization. The monomer is sulfonated in advance to create a pre-sulfonated monomer, which then undergoes polymerization to form the final polymer. This ensures uniform sulfonation positioning throughout the polymer structure, as the sulfonation occurs at the monomer level before the polymer chain forms, eliminating the irregularity problem of post-polymerization sulfonation.
2Productivity
If nitrobenzene is used as solvent for polymerization to achieve monomer solubility, then the polymerization can proceed, but the polymer product precipitates during polymerization limiting molecular weight and requiring toxic solvent handling
Solution Approach 1:
The patent applies parameter changes by switching from nitrobenzene solvent to water as the polymerization medium. This fundamental change in solvent parameter enables the polymerization to proceed without precipitation, allowing the formation of high molecular weight polymers. The water-soluble nature of the pre-sulfonated monomer and resulting polymer eliminates the harmful precipitation effect while maintaining productive polymerization.
3Productivity
If conventional polymerization methods are used, then polymerization can occur, but the process requires high temperature and extended time, increasing energy consumption
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions through the use of pre-sulfonated monomers and water as solvent. This combination enables the polymerization to proceed at lower temperatures and for shorter durations compared to conventional methods. The altered chemical parameters of the monomer (pre-sulfonation) and medium (water) collectively reduce the energy input required while maintaining productive polymerization.
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
This method allows for the production of sulfonated polyphenylene polymers with controlled molecular weight and precise sulfonation, overcoming the limitations of irregular sulfonation and toxic solvent use, while enabling efficient recovery and utilization in electrochemical devices.
Implementation Method 1
An A2B2-type D-A polymerization using cyclopentadienone (Cp) units as diene for synthesizing phenylated PPs was developed. The synthesis was accomplished by repetitive D-A reaction of bis-Cps as an A2 monomer and bisacetylene as a B2 monomer
Data Source
AI summary
Described herein is a method for making sulfonated polyphenylene polymers and the uses thereof. Such sulfonated polyphenylene polymers, and membranes prepared therefrom, have applications in fuel cells, water electrolyzers, water purification, battery products, and other electrochemical devices.