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Radical Reactivity: Overview01:11

Radical Reactivity: Overview

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical Reactivity: Electrophilic Radicals01:02

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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into...
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radical Formation: Abstraction00:47

Radical Formation: Abstraction

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The electron of an atom can be abstracted from a compound by a relatively unstable radical to generate a new radical of relatively greater stability. For example, an initiator which forms radicals by homolysis can abstract a suitable species like a hydrogen atom or a halogen atom from a compound to generate a new radical. This ability of radicals to propagate by abstraction is a crucial feature of radical chain reactions.
Even though homolysis produces radicals, it is different from radical...
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Electrochemistry for Atom Transfer Radical Polymerization.

Abdirisak Ahmed Isse1, Armando Gennaro1

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|March 22, 2021
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Electrochemistry enhances Atom Transfer Radical Polymerization (ATRP) by clarifying mechanisms and enabling precise polymer synthesis. This approach aids in understanding activation, determining parameters, and resolving disputes in controlled radical polymerization.

Keywords:
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Area of Science:

  • Polymer Chemistry
  • Controlled Radical Polymerization (CRP)
  • Electrochemistry in Polymer Science

Background:

  • Atom Transfer Radical Polymerization (ATRP) is a leading technique for synthesizing polymers with controlled architecture.
  • Traditional ATRP methods often rely on empirical procedures, limiting mechanistic understanding.
  • Electrochemistry has emerged as a powerful tool in polymer science over the past decade.

Purpose of the Study:

  • To explore the synergistic contributions of electrochemistry to Atom Transfer Radical Polymerization (ATRP).
  • To elucidate fundamental aspects of ATRP mechanisms and processes.
  • To highlight key areas where electrochemical methods have advanced ATRP.

Main Methods:

  • Application of electrochemical techniques to study ATRP processes.
  • Investigating the mechanism of ATRP activation using electrochemical insights.
  • Utilizing electrochemistry for the determination of thermodynamic and kinetic parameters.

Main Results:

  • Electrochemical methods have significantly improved the understanding of ATRP activation mechanisms.
  • Key thermodynamic parameters and rate constants for activation and deactivation have been determined.
  • Electrochemistry has played a crucial role in resolving debates, such as the SARA ATRP vs SET-LRP dispute concerning Cu0.
  • Development of electrochemically-mediated ATRP processes.

Conclusions:

  • Electrochemistry provides powerful tools for advancing the mechanistic understanding and practical application of ATRP.
  • The integration of electrochemistry has led to significant progress in controlled radical polymerization.
  • Electrochemical mediation offers new avenues for precise polymer synthesis.