Solvent-Resistant Diafiltration Membranes for Polymer Sequence Control
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Solution Overview
Problem
Current methods for preparing non-naturally-occurring defined monomer sequence polymers face challenges in controlling the sequential arrangement of monomer units and efficiently separating products from reaction by-products and excess reagents, particularly in organic solvents, due to the lack of suitable solvent-stable membranes.
Innovation Solution
A process involving sequential monomeric coupling reactions in an organic solvent, followed by diafiltration using a membrane stable in organic solvents, which separates the product from reaction by-products and excess reagents by providing a higher rejection for the product than for the by-products, ensuring the monomer units have a backbone and side chain moieties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If sequential monomeric coupling reactions are performed in organic solvents to synthesize defined monomer sequence polymers, then the structural control and functionality of the polymers is improved, but the separation of products from reaction by-products and excess reagents becomes difficult due to lack of suitable solvent-stable membranes
Solution Approach 1:
The patent introduces an intermediary substance (aqueous phase buffer solution) that facilitates the separation process. The membrane device uses this intermediary to enable selective transport and separation of polymer products from by-products and excess reagents in organic solvent systems, resolving the contradiction between maintaining structural control and achieving efficient separation.
Solution Approach 2:
The patent replaces traditional mechanical separation methods with a membrane-based separation system. The membrane device provides a selective barrier that separates products from by-products and excess reagents based on their different permeability characteristics, enabling efficient separation without mechanical intervention in the organic solvent system.
2Manufacturing precision
If traditional membrane processes are used for separation, then separation of species by molecular weight is achieved, but the process cannot be applied to organic solvents due to lack of solvent stable membranes
Solution Approach 1:
The patent employs a composite membrane system that combines materials with complementary properties. The membrane device is designed to be stable in organic solvents while maintaining selective separation capabilities, allowing the application of membrane processes to organic solvent systems that were previously inaccessible to traditional membrane technology.
Solution Approach 2:
The patent changes the operational parameters of the membrane process to accommodate organic solvent systems. By adjusting conditions such as solvent type, flow rates, and membrane selection, the system achieves both high separation purity and solvent compatibility, making the process adaptable to various organic solvent environments.
3Manufacturing precision
If iterative coupling steps are used to attach monomers one-by-one, then the defined monomer sequence is achieved, but the purification at each step becomes complex and time-consuming
Solution Approach 1:
The patent implements continuous purification through the membrane device that operates throughout the coupling process. Instead of discrete purification steps between coupling reactions, the membrane system continuously separates products from by-products and excess reagents, maintaining the defined monomer sequence while eliminating time-consuming intermediate purification steps.
Solution Approach 2:
The patent merges the coupling reaction and purification operations into a single integrated process. The membrane device is incorporated into the reaction system, allowing simultaneous coupling and separation to occur in one operation, thereby reducing the overall time required compared to separate iterative purification steps.
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 process effectively prepares non-naturally-occurring defined monomer sequence polymers with distinct monomer units, enhancing the control over structural and functional properties and enabling efficient separation, thereby overcoming the limitations of existing methods.
Implementation Method 1
separated by a process of diafiltration using a membrane that is stable in the organic solvent and which provides a rejection for the product which is greater than the rejection for the second compound
Data Source
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AI summary
A process for preparing non-naturally-occurring defined monomer sequence polymers is provided, and in which a high degree of synthetic control is obtained by the use of solvent resistant diafiltration membranes. Also provided is a process for separating non-naturally- occurring defined monomer sequence polymers from synthetic by-products or excess reagents using solvent resistant diafiltration membranes, and a use of a solvent resistant diafiltration membrane in processes for preparing and separating non-naturally-occurring defined monomer sequence polymers.