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Radical Reactivity: Concentration Effects01:20

Radical Reactivity: Concentration Effects

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In a radical reaction, the concentration of starting materials governs the selectivity of a radical. For example, the reaction between an alkyl halide and an alkene, in the presence of tin hydride and AIBN, begins with the generation of a tin radical. The generated radical then abstracts halogen from the alkyl halide, producing an alkyl radical. This alkyl radical can either react with tin hydride, yielding an alkane, or add to an alkene, generating a nitrile-stabilized radical, eventually...
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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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Alkali Metals03:06

Alkali Metals

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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
Table 1: Properties of the alkali metals
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Recent developments in atom transfer radical polymerization (ATRP): methods to reduce metal catalyst concentrations.

Qin Lou1, Devon A Shipp

  • 1Department of Chemistry & Biomolecular Science, Center for Advanced Materials Processing, Clarkson University, Potsdam, New York 13699-5810, USA.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|April 28, 2012
PubMed
Summary

Atom transfer radical polymerization (ATRP) has advanced with new methods like ARGET ATRP and eATRP. These techniques significantly reduce metal catalyst levels, enabling better polymer synthesis and material discovery.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Atom transfer radical polymerization (ATRP) is a versatile technique for synthesizing polymers with controlled molecular weights and architectures.
  • A major limitation of conventional ATRP is the residual metal catalyst contamination in the final polymer product, hindering industrial applications.

Purpose of the Study:

  • To review recent advancements in ATRP, focusing on "activators regenerated by electron transfer" ATRP (ARGET ATRP) and electrochemically mediated ATRP (eATRP).
  • To provide an overview of the mechanisms and outcomes of these low-metal-catalyst ATRP variants.

Main Methods:

  • Discussion of the mechanistic principles behind ARGET ATRP and eATRP.
  • Analysis of polymerization outcomes, including molecular weight control and polymer functionality.

Main Results:

  • ARGET ATRP and eATRP enable polymer synthesis with precise control over molecular weight and functionality.
  • These methods drastically reduce catalyst concentrations to parts per million levels, mitigating metal contamination issues.

Conclusions:

  • Recent developments in ATRP, particularly ARGET ATRP and eATRP, address the critical challenge of metal contamination.
  • These innovative ATRP techniques pave the way for broader industrial adoption and the development of advanced polymeric materials.