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Related Concept Videos

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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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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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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The transfer function is a fundamental concept in the analysis and design of linear time-invariant (LTI) systems. It offers a concise way to understand how a system responds to different inputs in the frequency domain. It serves as a bridge between the time-domain differential equations that describe system dynamics and the frequency-domain representation that facilitates easier manipulation and analysis.
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Related Experiment Video

Updated: Feb 9, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Externally controlled atom transfer radical polymerization.

Xiangcheng Pan1, Marco Fantin, Fang Yuan

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200433, China. panxc@fudan.edu.cn.

Chemical Society Reviews
|June 6, 2018
PubMed
Summary
This summary is machine-generated.

External stimuli regulate atom transfer radical polymerization (ATRP) via electrical, light, or mechanical forces. This review covers advanced ATRP techniques, their mechanisms, and applications in creating complex polymers and functional materials.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Organic Synthesis

Background:

  • Atom Transfer Radical Polymerization (ATRP) is a versatile controlled polymerization technique.
  • Precise control over polymer architecture and molecular weight is crucial for advanced materials.
  • External stimuli offer novel pathways for regulating polymerization processes.

Purpose of the Study:

  • To review the state-of-the-art in externally regulated ATRP.
  • To highlight the mechanistic aspects of various ATRP techniques.
  • To summarize synthetic procedures and applications of polymers synthesized via external control.

Main Methods:

  • Review of literature on externally regulated ATRP techniques.
  • Analysis of mechanistic principles for eATRP, photoATRP, mechanoATRP, ARGET, SARA, and ICAR ATRP.
  • Focus on polymer synthesis, complex architectures, and functional materials.

Main Results:

  • Demonstration of spatial and temporal control over ATRP using electrical, light, and mechanical stimuli.
  • Overview of chemically and thermally regulated ATRP methods.
  • Examples of polymers with complex architectures and functional materials prepared through these techniques.

Conclusions:

  • External regulations provide powerful tools for precise control in ATRP.
  • Externally regulated ATRP enables the synthesis of advanced polymers with tailored properties.
  • Future perspectives include further development of stimuli-responsive polymerization and novel applications.