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Related Concept Videos

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...
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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 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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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: Chain Branching01:17

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The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
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Related Experiment Video

Updated: Sep 3, 2025

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization: A Mechanistic Perspective.

Francesca Lorandi1,2, Marco Fantin3, Krzysztof Matyjaszewski1

  • 1Department of Chemistry, Carnegie Mellon University, 4400 Fifth Avenue, Pittsburgh, Pennsylvania 15213, United States.

Journal of the American Chemical Society
|July 26, 2022
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Summary
This summary is machine-generated.

Atom Transfer Radical Polymerization (ATRP) has evolved significantly, offering precise polymer synthesis. Mechanistic studies are key to advancing catalyst design and predicting polymerization outcomes for future innovations.

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Area of Science:

  • Polymer Chemistry
  • Catalysis
  • Organic Synthesis

Background:

  • Atom Transfer Radical Polymerization (ATRP) is a cornerstone technique in modern polymer chemistry.
  • Continuous advancements in catalyst design and reaction conditions have expanded its utility.
  • Understanding polymerization mechanisms is crucial for controlling polymer properties.

Purpose of the Study:

  • To provide a comprehensive overview of fundamental advances in ATRP.
  • To highlight the critical role of mechanistic studies in catalyst and reaction design.
  • To discuss recent developments and future challenges in ATRP.

Main Methods:

  • Review of traditional and modern ATRP systems.
  • Analysis of mechanistic studies informing catalyst design.
  • Exploration of stimuli-responsive and photochemical ATRP systems.

Main Results:

  • ATRP is a highly versatile method for synthesizing well-defined polymers.
  • Mechanistic insights enable improved catalyst selectivity and control.
  • Novel catalytic systems offer enhanced polymerization control and new possibilities.

Conclusions:

  • Mechanistic understanding is paramount for the continued evolution of ATRP.
  • Recent innovations focus on external stimuli control and advanced catalytic approaches.
  • Future research directions include addressing open challenges in catalyst efficiency and scope.