Flow-Type Anionic Polymerization System for Monodispersity
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Solution Overview
Problem
Living anionic polymerization by the batch method is limited by the need for cryogenic cooling, mechanical stirring, and uneven distribution of reactants, resulting in low monomer conversion rates and limited monodispersity of polymers, making it unsuitable for mass production and further improvements.
Innovation Solution
A flow-type reaction system where anionic polymerizable monomers and initiators are introduced into separate flow paths, joined, and then mixed with a polar solvent, allowing for controlled polymerization and termination, achieving a higher monodispersity and conversion rate through optimized solvent polarity and flow path design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If living anionic polymerization is performed by batch method, then polymerization can be carried out, but cryogenic cooling facilities are required and it is not suited for mass production
Solution Approach 1:
The batch process is segmented into continuous flow processes, dividing the polymerization into separate stages (mixing zone, reaction zone, termination zone) that occur continuously along the flow path, enabling mass production without cryogenic facilities
Solution Approach 2:
The invention changes the temperature parameter from cryogenic conditions to ambient or mild heating conditions by introducing a polar solvent that modifies the reaction environment, eliminating the need for cryogenic cooling equipment
2Manufacturing precision
If mechanical stirring is used in batch method, then mixing can be achieved, but monomer or polymerization initiator becomes unevenly localized, limiting dispersity and monomer conversion rate
Solution Approach 1:
Mechanical stirring is replaced with a flow-based mixing system where reactants are continuously mixed through controlled flow paths and the introduction of polar solvent, achieving uniform distribution without mechanical agitation and improving both dispersity and conversion rate
3Manufacturing precision
If JP2016-183217A method is used, then high-molecular-weight polymer with monodisperse distribution is obtained, but monomer conversion rate becomes low and manufacturing efficiency is unsatisfactory
Solution Approach 1:
The polymerization process is made continuous rather than batch, with continuous flow of reactants through the reaction zone and continuous termination, maintaining high conversion rates while preserving monodisperse molecular weight distribution through sustained reaction conditions
Solution Approach 2:
A polar solvent is introduced as an intermediary substance that mediates between the monomer and initiator, enabling controlled polymerization that achieves both high conversion rates and narrow molecular weight distribution by modifying the reaction environment
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 method achieves a highly monodisperse molecular weight distribution with excellent monomer conversion rates, suitable for industrial-scale polymer manufacturing, overcoming the limitations of batch methods.
Implementation Method 1
Living anionic polymerization is known as a method that can realize a precise polymerization reaction in synthesizing polymers having special structures
Implementation Method 2
allowing a conjoined liquid MAB of the liquid A and the liquid B to join with the liquid C at downstream of the joining portion; subjecting the anionic polymerizable monomer to anionic polymerization while a conjoined liquid MABC of the conjoined liquid MAB and the liquid C is flowing
Data Source
AI summary
Provided is a method for manufacturing a polymer by a flow-type reaction, including introducing a liquid A containing an anionic polymerizable monomer and a non-polar solvent, a liquid B containing an anionic polymerization initiator and a non-polar solvent, a liquid C containing a polar solvent, and a polymerization terminator into different flow paths; allowing the liquids to flow in the respective flow paths; allowing the liquid A and the liquid B to join together at a joining portion; allowing a conjoined liquid MAB of the liquid A and the liquid B to join with the liquid C at downstream of the joining portion; subjecting the anionic polymerizable monomer to anionic polymerization while a conjoined liquid MABC of the conjoined liquid MAB and the liquid C is flowing to downstream in a reaction flow path; and allowing a polymerization reaction solution flowing in the reaction flow path to join with the polymerization terminator so that the polymerization reaction is terminated and a polymer is obtained, in which a polarity of a solvent of the liquid MABC is made higher than a polarity of a solvent of the liquid MAB. Also provided is a flow-type reaction system suited for performing the manufacturing method.