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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Microflow system controlled carbocationic polymerization of vinyl ethers.

Aiichiro Nagaki¹, Takeshi Iwasaki, Kohsuke Kawamura

¹Department of Synthetic and Biologycal Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku, Kyoto, Japan.

Chemistry, an Asian Journal

|July 8, 2008

Summary

This summary is machine-generated.

A novel microflow system effectively initiates cationic polymerization using N-acyliminium ions or triflic acid. This method achieves precise control over molecular weight and enables block copolymer synthesis for vinyl ethers.

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Area of Science:

Polymer Chemistry
Organic Synthesis
Microfluidics

Background:

Cationic polymerization offers a versatile route to polymers but often faces challenges in precise control.
Microflow systems provide enhanced control over reaction parameters, potentially improving polymerization outcomes.
N-acyliminium ions and triflic acid are known initiators for carbocationic polymerization.

Purpose of the Study:

To investigate the efficacy of a microflow system for controlled cationic polymerization of vinyl ethers.
To evaluate N-acyliminium ions as initiators in this microflow system.
To demonstrate the synthesis of block copolymers using this controlled method.

Main Methods:

Utilized a microflow system comprising micromixers and microtube reactors for cationic polymerization.
Employed N-acyliminium ions as initiators for the polymerization of n-butyl vinyl ether at -78°C.
Investigated trifluoromethanesulfonic acid (TfOH) as an alternative initiator within the microflow setup.

Main Results:

Achieved very narrow molecular weight distribution (M(w)/M(n)=1.14) with N-acyliminium ion initiation.
Demonstrated linear correlation between molecular weight and monomer/initiator ratio.
Successfully synthesized block polymers and achieved high molecular weight control even at -25°C with TfOH.

Conclusions:

The developed microflow system is an effective platform for controlled cationic polymerization of vinyl ethers.
N-acyliminium ions and TfOH are suitable initiators for this microflow system, enabling precise polymer synthesis.
This approach offers a practical tool for microflow-controlled carbocationic polymerization and block copolymer synthesis.