Nitrogen Monomer Polymerization Using Ionic Liquid Solvent
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current free radical polymerization methods, including the RAFT process and ionic liquid-based processes, are inefficient and unable to achieve polydispersity indices (PDI) less than 1.5, which is necessary for advanced polymer applications, due to limitations in monomer compatibility and reaction conditions.
Innovation Solution
A free radical polymerization process using nitrogen-containing monomers and specifically designed ionic liquids, such as those represented by formulas (I), (II), and (III), to achieve polymers with a PDI less than 1.5, allowing for faster reaction times and broader monomer compatibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional free radical polymerization with RAFT reagent is used, then polymer products with narrow molecular weight distribution can be obtained, but reaction time is extended and reaction efficiency is reduced
Solution Approach 1:
The patent removes the RAFT reagent from the polymerization system entirely, extracting the chain transfer function and replacing it with an ionic liquid that provides both solvent and chain transfer capabilities, thereby simplifying the system and improving efficiency while maintaining narrow molecular weight distribution
Solution Approach 2:
The ionic liquid serves multiple functions simultaneously: it acts as the polymerization solvent, as the chain transfer reagent, and as a catalyst promoter, eliminating the need for separate RAFT reagent and enabling faster reaction rates while controlling molecular weight distribution
2Manufacturing precision
If monomers are polymerized under nitrogen atmosphere and very dilute solution conditions, then polymer products with narrow molecular weight distribution are obtained, but reaction time is extended and reaction completeness is reduced
Solution Approach 1:
The patent changes the concentration parameter from very dilute conditions to relatively concentrated conditions by using ionic liquid as both solvent and chain transfer reagent, which maintains narrow molecular weight distribution while significantly reducing reaction time and improving reaction completeness
3Productivity
If ionic liquid is used as solvent to increase polymerization efficiency, then reaction time is reduced, but molecular weight distribution becomes wider
Solution Approach 1:
The ionic liquid acts as an intermediary substance that mediates between the monomer and initiator, providing controlled chain transfer through its specific chemical structure (containing labile hydrogen atoms) to maintain narrow molecular weight distribution while enabling fast polymerization rates
4Manufacturing precision
If traditional active cation and anion polymerization methods are used, then polymerization degree and molecular weight distribution can be controlled, but variety of applicable monomers is limited and reaction conditions are strict
Solution Approach 1:
The ionic liquid-based free radical polymerization system provides universal applicability to diverse monomers including vinyl, acrylate, methacrylate, and styrene derivatives, while maintaining controlled molecular weight distribution, thereby unifying the limitations of cationic and anionic methods into a single versatile system
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 achieves polymers with a PDI of less than 1.5, enabling the production of polymers with narrow molecular weight distribution efficiently, suitable for high-tech applications, and can be used for both homopolymer and block/random polymer materials without the need for RAFT reagents or highly dilute solutions.
Implementation Method 1
a free radical polymerization process for preparing polymers with low polydispersity index includes polymerizing at least one free radically polymerizable monomer with at least one initiator in the present of at least one ionic liquid as solvent
Data Source
AI summary
Free radical polymerization process for preparing polymers with low polydispersity index and polymers obtained thereby. The process includes polymerizing at least one reactive monomer with at least one initiator and at least one ionic liquid (serving as solvent) to obtain polymers having a low polydispersity index of less than 1.5, wherein the reactive monomer is a nitrogen-containing monomer. In addition, the free radical polymerization processes have reaction time within 3 hours.