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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

3.1K
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...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
2.8K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.6K
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...
2.6K
Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Polymers02:34

Polymers

43.9K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

3.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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The evolution of cyclopropenium ions into functional polyelectrolytes.

Yivan Jiang1, Jessica L Freyer1, Pepa Cotanda2

  • 1Department of Chemistry, Columbia University, New York, New York 10027, USA.

Nature Communications
|January 10, 2015
PubMed
Summary
This summary is machine-generated.

Researchers developed new functional polyelectrolytes using aromatic cyclopropenium ions. These materials offer tunable properties, high ionic conductivity, and thermal stability for advanced applications like energy storage and fuel cells.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrochemistry

Background:

  • Nanostructured cationic block copolyelectrolytes are crucial for energy storage and electronic devices due to mechanical integrity and ionic conductivity.
  • Existing cationic polyelectrolytes have limited modularity for property tuning, often localizing charge on heteroatoms.

Purpose of the Study:

  • To develop a novel class of functional polyelectrolytes with tunable physical properties.
  • To overcome the limitations of current cationic polyelectrolytes for enhanced performance in ion-conducting applications.

Main Methods:

  • Synthesis of polymers and nanoparticles utilizing aromatic cyclopropenium ion building blocks.
  • Incorporation of various functional groups into cyclopropenium monomers to modulate material properties.

Main Results:

  • Demonstrated facile synthesis of a series of functional polyelectrolytes and nanoparticles.
  • Achieved high ionic conductivity and excellent thermal stability in the developed materials.
  • Showcased the tunability of physical properties through functional group incorporation.

Conclusions:

  • The new class of aromatic cyclopropenium-based polyelectrolytes offers a versatile platform for ion-conducting materials.
  • These materials present an attractive alternative for developing advanced ion-conducting membranes for energy storage and fuel cells.