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Related Concept Videos

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.4K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.7K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.7K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.3K
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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.3K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.2K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.3K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.3K

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Related Experiment Video

Updated: Sep 22, 2025

Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators
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Highly Stereoselective Synthesis of 1,6-Ketoesters Mediated by Ionic Liquids: A Three-component Reaction Enabling Rapid Access to a New Class of Low Molecular Weight Gelators

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Metathesis Step-Growth Polymerizations in Ionic Liquid.

Chester Simocko1, Yong Yang2, Timothy M Swager2

  • 1Center for Macromolecular Science and Engineering, The George and Josephine Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.

ACS Macro Letters
|May 24, 2022
PubMed
Summary
This summary is machine-generated.

Ionic liquids enable efficient high-temperature polymerizations using metathesis. This method yields high molecular weight polymers with short reaction times and minimal catalyst, applicable to acyclic diene metathesis.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Green Chemistry

Background:

  • Metathesis step-growth polymerizations often require high temperatures.
  • Ionic liquids possess high boiling points, allowing for high-temperature reactions under low pressure.

Purpose of the Study:

  • To explore metathesis step-growth polymerizations in ionic liquids.
  • To leverage the properties of ionic liquids for efficient polymer synthesis.
  • To investigate the formation of high molecular weight polymers.

Main Methods:

  • Utilized ionic liquids as reaction media for metathesis polymerizations.
  • Optimized reaction conditions including catalyst loading and reaction time.
  • Synthesized main-chain triptycene polymers.

Main Results:

  • Achieved efficient formation of high polymers with small catalyst amounts and short reaction times.
  • Successfully synthesized high molecular weight main-chain triptycene polymers with high triptycene incorporation.
  • Demonstrated applicability to acyclic diene metathesis (ADMET).

Conclusions:

  • Ionic liquids provide a suitable medium for high-temperature metathesis polymerizations.
  • This methodology offers an efficient route to high molecular weight polymers.
  • The approach is versatile for metathesis reactions driven by volatile byproduct removal.