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Related Concept Videos

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,...
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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...
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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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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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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by &#960;-&#960; Stacking Interactions
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Sequential Radical-Anionic Polymerizations via Consecutive Photo-Reduction.

Hong Zhao1, Yi Liu1, Jin-Xiang Ai2

  • 1Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P.R. China.

Angewandte Chemie (International Ed. in English)
|January 21, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces a novel sequential radical-anionic polymerization method using photoreduction. This approach avoids hazardous lithium reagents, expanding monomer options and applications in polymer science.

Keywords:
Anionic polymerizationPhotochemistryPolymerizationRadical polymerization

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Polymer properties depend on structure, driving innovation in polymerization methods.
  • Existing radical and anionic polymerization techniques have limitations, including hazardous reagents and energy-intensive processes.

Purpose of the Study:

  • To develop a novel sequential radical-anionic polymerization method.
  • To eliminate the reliance on hazardous lithium-based reagents in anionic polymerization.
  • To expand the range of monomers usable in anionic polymerization.

Main Methods:

  • In situ generation of carbon radicals and carbanions via photoreduction.
  • Sequential radical-anionic chain-growing mechanism.
  • Photo-induced consecutive single-electron transfer reduction.

Main Results:

  • Successfully demonstrated a sequential radical-anionic (co-)polymerization.
  • Eliminated the need for lithium and associated safety and energy concerns.
  • Overcame limitations in copolymerizing monomers with disparate electronic properties.
  • Showcased practical applications through large-scale synthesis and vulcanization of functionalized rubbers.

Conclusions:

  • The developed photo-induced sequential radical-anionic polymerization offers a safer and more versatile alternative to traditional methods.
  • This strategy broadens the scope of anionic polymerization, enabling the synthesis of novel polymers and materials.
  • The method holds significant potential for both academic research and industrial polymer production.