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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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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 earliest recorded discussion of the basic structure of matter comes from ancient Greek philosophers. Leucippus and Democritus argued that all matter was composed of small, finite particles that they called atomos, meaning “indivisible.” Later, Aristotle and others came to the conclusion that matter consisted of various combinations of the four “elements” — fire, earth, air, and water — and could be infinitely divided. Interestingly, these philosophers...
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Advanced Materials by Atom Transfer Radical Polymerization.

Krzysztof Matyjaszewski1

  • 1Department of Chemistry, Carnegie Mellon University, Pittsburgh, PA, 15213, USA.

Advanced Materials (Deerfield Beach, Fla.)
|March 28, 2018
PubMed
Summary
This summary is machine-generated.

Atom transfer radical polymerization (ATRP) enables advanced material synthesis with precise control. Highly active catalysts allow greener procedures, expanding applications in functional materials and bioconjugates.

Keywords:
ATRPatom transfer radical polymerizationbioconjugatescontrolled architectureshybrid materials

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Atom transfer radical polymerization (ATRP) is a versatile technique for creating polymers with controlled architectures.
  • Developing more efficient and environmentally friendly polymerization methods is crucial for advanced materials synthesis.

Purpose of the Study:

  • To highlight advancements in Atom Transfer Radical Polymerization (ATRP) for sophisticated material preparation.
  • To showcase the impact of highly active catalysts on greener polymerization processes.
  • To demonstrate the synthesis of diverse polymer architectures and functional materials.

Main Methods:

  • Utilizing advanced catalysts with enhanced activity for Atom Transfer Radical Polymerization (ATRP).
  • Implementing precise control over polymer composition, topology, and functional group incorporation.
  • Synthesizing various polymer structures including copolymers, branched polymers, and hybrid materials.

Main Results:

  • Achieved environmentally benign ATRP procedures using parts-per-million (ppm) levels of catalyst.
  • Enabled precise synthesis of well-defined gradient, block, and comb copolymers.
  • Facilitated the creation of polymers with (hyper)branched structures, molecular brushes, networks, and bioconjugates.

Conclusions:

  • Atom transfer radical polymerization (ATRP) offers exceptional control for advanced material design.
  • Highly active catalysts significantly improve the sustainability and efficiency of ATRP.
  • The synthesized functional materials have broad applications in areas like thermoplastic elastomers, nanostructured carbons, and biorelated materials.