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Radical Chain-Growth Polymerization: Overview01:10

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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 Chain-Growth Polymerization: Mechanism01:09

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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 Reactivity: Overview01:11

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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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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 Formation: Overview01:03

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
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Radical Formation: Addition00:47

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Single-Electron Transfer Living Radical Polymerization Platform to Practice, Develop, and Invent.

Gerard Lligadas1,2, Silvia Grama1, Virgil Percec1

  • 1Roy & Diana Vagelos Laboratories, Department of Chemistry, University of Pennsylvania , Philadelphia, Pennsylvania 19104-6323, United States.

Biomacromolecules
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Summary
This summary is machine-generated.

This perspective clarifies single-electron transfer (SET) principles for SET living radical polymerization (SET-LRP). It aims to help researchers advance SET-LRP and other living polymerization methods.

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Area of Science:

  • Polymer Chemistry
  • Organic Chemistry
  • Physical Chemistry

Background:

  • Fundamental principles of single-electron transfer (SET) are crucial for understanding advanced polymerization techniques.
  • Existing literature presents varied definitions of SET, leading to potential confusion among researchers.
  • Living radical polymerization (LRP) methods aim for precise control over polymer architecture and molecular weight.

Purpose of the Study:

  • To present fundamental aspects of single-electron transfer (SET) principles.
  • To apply these principles to single-electron transfer living radical polymerization (SET-LRP) using IUPAC definitions.
  • To clarify contradictory literature reports by discussing additional definitions for nonexperts.

Main Methods:

  • Discussion of established SET principles based on the work of Taube, Eberson, Chanon, and Kochi.
  • Application of IUPAC's organic chemistry division definition of SET to SET-LRP.
  • Review of current methodologies for practicing SET-LRP.

Main Results:

  • A comprehensive overview of SET principles and their application in SET-LRP.
  • Clarification of different definitions of SET to aid understanding.
  • Discussion on the evolution and current state of SET-LRP methodologies.

Conclusions:

  • This perspective provides a unified understanding of SET principles for SET-LRP.
  • It aims to equip both experts and nonexperts with the knowledge to advance SET-LRP.
  • The goal is to elevate SET-LRP and other LRP methods to the precision of established living polymerization techniques.