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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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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 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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Chemical substances interact in many different ways. Certain chemical reactions exhibit common patterns of reactivity. Due to the vast number of chemical reactions, it becomes necessary to classify them based on the observed patterns of interaction.
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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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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Fluorogenic atom transfer radical polymerization in aqueous media as a strategy for detection.

Zachary T Allen1, Jemima R Sackey-Addo1, Madeline P Hopps1

  • 1Department of Chemistry , Trinity University , One Trinity Place , San Antonio , TX 78212 , USA .

Chemical Science
|February 19, 2019
PubMed
Summary

This study introduces a novel fluorogenic polymerization method for real-time signal amplification. This technique enables sensitive detection of water-soluble analytes and biomolecules in aqueous solutions.

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Area of Science:

  • Polymer Chemistry
  • Analytical Chemistry
  • Biotechnology

Background:

  • Developing sensitive detection methods for water-soluble analytes and biomolecules in aqueous media is crucial for diagnostics.
  • Existing signal amplification strategies often face limitations in aqueous environments.

Purpose of the Study:

  • To develop a novel fluorogenic polymerization approach for real-time signal amplification.
  • To enable sensitive and quantitative detection of aqueous analytes and biomolecular recognition events.

Main Methods:

  • Synthesis of fluorogenic monomers.
  • Co-polymerization using atom transfer radical polymerization (ATRP) in water.
  • Real-time monitoring of fluorescence for signal amplification.

Main Results:

  • Demonstrated increasing polymer fluorescence with reaction time and initiator concentration.
  • Achieved quantitative detection of a small-molecule initiator over a broad linear range (pM to mM).
  • Optimized conditions enabled sub-picomolar initiator detection at 60 °C in 1 hour.
  • Successfully applied the method to detect streptavidin using a biotinylated ATRP initiator.

Conclusions:

  • Established the first example of a fluorogenic ATRP reaction.
  • Fluorogenic polymerization is a promising approach for direct detection of aqueous analytes.
  • This method offers a sensitive platform for biomolecular recognition events in aqueous solutions.