Blended Block Copolymer Membranes for Fouling-Resistant Filtration
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Solution Overview
Problem
Current asymmetric ultrafiltration membranes derived from block copolymers lack effective methods for incorporating foreign functional components and exhibit limited diversity in pore surface chemistry, with existing methods often requiring multiple post-fabrication steps and being prone to exfoliation or only providing single functionality.
Innovation Solution
The development of blended isoporous graded films using chemically distinct block copolymers, such as triblock terpolymers, which allow for the incorporation of functional molecules and inorganic materials during membrane fabrication, enabling simultaneous pH-responsive behavior, binding sites, and hydrophilic groups to reduce fouling without additional post-processing steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If foreign functional components are incorporated through post-fabrication binding layers, then functional diversity is improved, but manufacturing complexity and number of processing steps increase
Solution Approach 1:
The patent incorporates foreign functional components during the membrane fabrication process itself rather than adding them afterward. The casting solution includes functional additives that are integrated into the membrane structure during phase separation, eliminating the need for separate post-fabrication binding layer formation and functionalization steps.
Solution Approach 2:
The patent combines multiple functions into a single fabrication process. The membrane formation, pore structure creation, and functional component incorporation all occur simultaneously during the casting and phase separation process, rather than as separate sequential steps.
2Adaptability or versatility
If binding layers are used to attach functional materials, then functional component incorporation is improved, but layer stability deteriorates due to easy exfoliation
Solution Approach 1:
The patent integrates functional components directly into the membrane matrix during fabrication, eliminating the separate binding layer that is prone to exfoliation. The functional additives become part of the continuous phase or pore structure during phase separation, creating intrinsic rather than extrinsic functionalization.
Solution Approach 2:
The patent uses the phase separation process itself as an intermediary mechanism to incorporate functional components. The additives are distributed throughout the casting solution and become embedded in the membrane structure through the phase inversion process, rather than requiring separate adhesion mechanisms.
3Ease of manufacture
If single functionality membranes are used, then manufacturing simplicity is maintained, but adaptability to different applications is limited
Solution Approach 1:
The patent changes the chemical parameters of the casting solution by incorporating different functional additives (such as polymers with different chemistries, inorganic nanoparticles, or small molecules) to create membranes with diverse pore surface chemistries while maintaining the same basic fabrication process.
Solution Approach 2:
The patent creates a universal fabrication platform that can produce membranes with multiple functionalities by simply changing the additive composition in the casting solution. The same phase separation process accommodates various functional components, making the manufacturing method universally applicable to different application requirements.
4Adaptability or versatility
If multiple post-fabrication steps are used to add functionalities, then functional diversity is improved, but production time and complexity increase
Solution Approach 1:
The patent merges membrane formation and functional component incorporation into a single simultaneous process. The functional additives are present in the casting solution from the beginning and are incorporated during the phase separation that forms the membrane, eliminating sequential post-fabrication steps.
Solution Approach 2:
The patent performs functional component incorporation preliminarily, during the membrane fabrication process itself. The additives are integrated into the membrane structure during casting and phase separation, before the membrane is removed from the support or subjected to any post-processing.
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 approach results in membranes with tailored pore surface chemistries and functionalities, enhancing selectivity and reducing fouling, while eliminating the need for laborious post-fabrication modifications and providing improved stability and performance in filtration applications.
Implementation Method 1
asymmetric superstructure formed in a block copolymer via phase separation
Implementation Method 2
block copolymer self-assembly and non-solvent induced phase separation (SNIPS) process
Implementation Method 3
non-solvent induced phase separation (SNIPS) process
Implementation Method 4
the morphology of the top surface layer was tuned by the addition of small organic molecules and metal ions, which form metal-polymer complexes
Implementation Method 5
an additive that chemically interacts/swells one block of the block copolymer, pore sizes were tailored
Data Source
AI summary
Methods of making blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers and blended, isoporous, asymmetric (graded) films (e.g. ultrafiltration membranes) comprising two or more chemically distinct block copolymers. The generation of blended membranes by mixing two chemically distinct block copolymers in the casting solution demonstrates a pathway to advanced asymmetric block copolymer derived films, which can be used as ultrafiltration membranes, in which different pore surface chemistries and associated functionalities can be integrated into a single membrane via standard membrane fabrication, i.e. without requiring laborious post-fabrication modification steps. The block copolymers may be diblock, triblock and/or multiblock mixes and some block copolymers in the mix may be functionally modified. Triblock copolymers comprising a reactive group (e.g., sulfhydryl group) terminated block and films comprising the triblock copolymers.