Sulfonated Polyarylenesulfone Synthesis With Faster Polycondensation
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Solution Overview
Problem
The production process for sulfonated polyarylenesulfone polymers is inefficient due to long reaction times and challenges in isolating and recycling the polymers, particularly when high amounts of di-sulfonated monomers are used.
Innovation Solution
A process involving a reaction mixture with specific ratios of aromatic dihalogensulfone components, aromatic dihydroxy compounds, and carbonate compounds, which reduces condensation time and produces sulfonated polyarylenesulfone polymers with high viscosity numbers and good proton conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional polycondensation methods are used to prepare sulfonated polyarylenesulfone polymers, then the reaction can proceed with standard conditions, but the reaction time becomes extremely long and the work-up and isolation processes become complicated
Solution Approach 1:
The patent applies parameter changes by modifying the reaction conditions - specifically using a two-stage polycondensation process with controlled temperature progression (first stage: 60-80°C, second stage: 80-100°C) and staged addition of reagents. This systematic parameter optimization reduces the reaction time from extremely long conventional times to 2-6 hours while maintaining polymer synthesis reliability.
2Ease of manufacture
If sulfonated copolymers are precipitated in isopropanol to isolate the polymer, then the polymer can be separated from the reaction mixture, but huge volumes of solvent mixtures are created that require re-work or disposal
Solution Approach 1:
The patent implements discarding and recovering by collecting the filtration mother liquor after polymer isolation and reusing it as the reaction medium for subsequent polymerizations. This eliminates the need for fresh solvent in each batch, dramatically reducing solvent consumption and waste disposal requirements while maintaining ease of manufacture.
Solution Approach 2:
The filtration mother liquor serves multiple functions: it acts as the reaction medium for the next polymerization batch, provides dissolved monomers and catalysts for continued reaction, and eliminates the need for separate solvent recovery steps. This multi-functionality reduces both solvent volume and process complexity.
3Reliability
If high amounts of di-sulfonated monomers are used to achieve desired polymer properties, then the polymer performance improves, but the condensation reaction time increases and isolation becomes more difficult
Solution Approach 1:
The patent applies segmentation by dividing the polymerization into two distinct stages: first stage forms the base polymer matrix with controlled sulfonation, and the second stage completes the polycondensation and achieves full sulfonation. This segmented approach allows high di-sulfonated monomer content (30-70 mol%) to be incorporated while maintaining reasonable reaction times (2-6 hours total) and facilitating isolation.
Solution Approach 2:
The patent implements preliminary action by pre-dissolving the di-sulfonated monomers and catalysts in the reaction medium before initiating polycondensation. This preliminary preparation ensures uniform distribution of reactive groups, preventing localized complications during isolation even when high amounts of di-sulfonated monomers are used, and enables efficient processing.
4Quantity of substance
If the polymer suspension contains high amounts of salts from the polycondensation reaction, then the polymer can be formed, but the separation of salts and subsequent precipitation causes filtration clogging and product loss
Solution Approach 1:
The patent uses an intermediary approach by selecting N-methyl-2-pyrrolidone (NMP) as the reaction and filtration medium. NMP's high boiling point and strong solvating power allow it to dissolve both the polymer and salts during reaction, then upon filtration and drying, the salts are easily separated while the polymer remains intact. This intermediary solvent simplifies the separation process and prevents filtration clogging.
Solution Approach 2:
The patent applies parameter changes by conducting the polycondensation at elevated temperatures (60-100°C) in NMP, which maintains all components in solution during reaction. The temperature and solvent parameters are optimized so that upon cooling and filtration, salts precipitate cleanly while polymer remains soluble or forms easily filterable precipitate, maximizing yield and minimizing process complexity.
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 significantly reduces reaction time, produces polymers with high viscosity numbers, and enables the creation of membranes with good proton conductivity, addressing the inefficiencies and challenges of existing methods.
Implementation Method 1
High-performance thermoplastics such as polyarylenesulfone polymers are formed by polycondensation reactions which are typically carried out at a high reaction temperature in polar aprotic solvents
Implementation Method 2
After separation of the salts, usually precipitation in isopropanol is done to isolate the sulfonated polyarylenesulfone polymers
Data Source
AI summary
The present invention relates to a method for the preparation of a sulfonated polyarylenesulfone polymer (sP), the sulfonated polyarylenesulfone polymer (sP) obtained by the inventive process, a membrane (M) comprising the sulfonated polyarylenesulfone polymer (sP), a process for the preparation of the membrane, and the use of the membrane (M) for the separation of gases from gas mixtures.