Fluorinated Multiblock Copolymer Membranes for Harsh Chemical Resistance
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Solution Overview
Problem
Existing fluorinated porous membranes lack chemical resistance to harsh solvents and exhibit fouling characteristics, limiting their use in non-aqueous and harsh chemical media due to imperfections in coating techniques and instability in organic solvents.
Innovation Solution
Multiblock copolymers with fluorinated blocks providing chemical resistance and antifouling properties, self-assembled to form isoporous structures with controlled pore sizes, allowing for high flux and selectivity in separation processes, achieved through pre- or post-fluorination of polymer blocks during or after polymerization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If fluorinated porous membranes are used to provide chemical resistance, then chemical stability is improved, but fouling characteristics worsen
Solution Approach 1:
The patent applies local quality by incorporating fluorinated blocks specifically at the pore surfaces and interfaces where fouling occurs, while maintaining non-fluorinated bulk polymer regions for mechanical strength. This localized fluorination provides chemical resistance and antifouling properties exactly where needed without requiring complete fluorination of the entire membrane structure.
Solution Approach 2:
The patent uses composite materials by creating multiblock copolymers that combine fluorinated blocks (providing chemical resistance) with non-fluorinated blocks (providing mechanical properties). This composite structure allows the membrane to simultaneously achieve chemical stability in harsh solvents while maintaining antifouling characteristics through the fluorinated surface regions.
2Stability of the object's composition
If coating techniques are applied to fluorinated membranes, then chemical resistance is improved, but manufacturing precision worsens due to pin-holes and delamination
Solution Approach 1:
The patent merges the fluorinated chemical resistance function directly into the membrane polymer structure itself through multiblock copolymer formation, eliminating the need for separate coating layers. The fluorinated blocks are chemically integrated into the membrane matrix, ensuring uniform distribution without pin-holes or delamination issues associated with physical coatings.
Solution Approach 2:
The patent applies self-service by utilizing the self-assembling properties of the multiblock copolymer to automatically form uniform fluorinated regions at pore surfaces during membrane fabrication. The fluorinated blocks spontaneously organize themselves in the correct locations without requiring external coating processes, achieving both chemical resistance and manufacturing precision.
3Ease of manufacture
If vinyl-derived polymers are used for isoporous structures, then ease of manufacture is improved, but reliability worsens due to instability in organic solvents
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition parameters of the polymer blocks, specifically incorporating fluorinated blocks with high chemical stability to replace the unstable vinyl-derived segments. This changes the solvent compatibility parameter, allowing the membrane to maintain reliability in organic solvents while retaining ease of manufacture through established copolymerization techniques.
4Stability of the object's composition
If fluorinated blocks are incorporated to provide chemical resistance, then chemical stability is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the polymer structure into distinct fluorinated and non-fluorinated blocks, where each segment performs a specific function. The fluorinated blocks provide chemical resistance while non-fluorinated blocks provide mechanical strength, creating a modular structure that achieves complex performance goals through simple, well-defined segments rather than a uniformly complex structure.
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 isoporous fluorinated block copolymer membranes exhibit high permeability, selectivity, and chemical stability, suitable for harsh chemical media, including organic and aqueous solutions, with improved antifouling properties and heat resistance, replacing traditional membrane technologies.
Implementation Method 1
self-assembled to form isoporous structures with controlled pore sizes
Implementation Method 2
at least one block comprises at least a portion that contains fluorine atoms... exhibit chemical stability, suitable for harsh chemical media
Implementation Method 3
allowing for high flux and selectivity in separation processes
Data Source
AI summary
Multi-block isoporous structures for non-aqueous and/or harsh chemical media having at least one of high separation specificity, chemical resistance, and antifouling properties, methods of manufacturing and use, for replacements or alternatives to existing separation membrane technologies.