Block-Copolymer Porous Substrates for Size-and-Charge Separation
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Solution Overview
Problem
Existing separation technologies struggle to effectively separate complex mixtures of materials with different sizes and ionic charges, particularly in the context of biomaterials, due to limitations in size exclusion and selective binding capabilities.
Innovation Solution
A separation article is developed comprising a porous polymeric substrate with block copolymers grafted using reversible deactivation radical polymerization, where the first polymeric block is covalently attached to the substrate and contains acidic or basic groups, while the second polymeric block is polyether-containing, enabling size exclusion and selective binding based on steric exclusion and ionic interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single separation mechanism is used, then the separation process is simple, but the ability to separate complex mixtures with different sizes and ionic charges is insufficient
Solution Approach 1:
The patent combines two distinct separation mechanisms (size exclusion and ionic binding) into a single integrated stationary phase. The d block copolymer structure provides both the size exclusion effect through its overall architecture and the ionic binding capability through functional groups on the first polymeric block, allowing simultaneous separation based on both size and charge properties of analytes
Solution Approach 2:
The stationary phase is constructed as a composite material consisting of a d block copolymer grafted onto a porous polymeric substrate. This composite structure integrates the size exclusion properties of the porous substrate with the selective binding capabilities of the functionalized block copolymer, achieving enhanced separation performance for complex mixtures
2Manufacturing precision
If size exclusion is used alone, then large molecules are separated effectively, but selective binding of materials with different ionic charges is not achieved
Solution Approach 1:
The d block copolymer structure implements local quality by concentrating ionic functional groups on the first polymeric block while maintaining the overall size exclusion architecture. This localized functionalization allows specific regions of the stationary phase to interact selectively with charged analytes while the global structure provides size-based separation, achieving both size exclusion and ionic binding in one system
3Adaptability or versatility
If ionic binding groups are added to the stationary phase, then selective binding improves, but the size exclusion capability is reduced
Solution Approach 1:
The stationary phase is segmented into distinct functional blocks: the porous polymeric substrate provides the size exclusion framework, while the grafted d block copolymer introduces ionic binding functionality. This segmentation allows each component to maintain its primary function without compromising the other, preserving size exclusion precision while adding binding capability
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 solution provides enhanced separation of materials based on size and charge, effectively isolating components with complementary groups, particularly useful for biomaterials, by leveraging the selective binding properties of the first polymeric block and size exclusion capabilities of the second block.
Implementation Method 1
a first polymeric block that can bind to acidic or basic groups on biomaterials
Implementation Method 2
a second polymeric block that provides size exclusion
Implementation Method 3
grafting a plurality of first polymeric blocks to the porous polymeric substrate using a reversible deactivation radical polymerization process
Data Source
AI summary
A separation article is provided that is useful for separation of complex samples that contain materials having different sizes and optionally having different ionic groups. The separation articles include a plurality of block copolymers grafted to a solid polymeric substrate using a reversible deactivation radical polymerization process. The block copolymers extend away from a surface of the solid porous polymeric substrate. The block has an outer block (i.e., second polymeric block) that provides size or steric exclusion and an inner block (i.e., first block) with acidic groups or salts thereof, basic groups or salts thereof, or combinations thereof that can bind with compounds having a complementary group and that are sufficiently small to pass through the size or steric exclusion second polymeric block. The separation articles can be used, for example, for separation of biomaterials in a sample.