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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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...
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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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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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Step-Growth Polymerization: Overview01:03

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Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
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Radical Reactivity: Overview01:11

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical Stitching Polymerization and Its Alternating Copolymerization.

Yusuke Hamada1, Soya Togawa1, Ryo Shintani1,2

  • 1Division of Chemistry, Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan.

Journal of the American Chemical Society
|July 2, 2024
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Summary

Researchers developed a new radical stitching polymerization method to create novel polyketones with saturated fused bicyclic units. These advanced polymers exhibit excellent thermal stability and transparency.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Saturated fused polycyclic polymers are underexplored.
  • Potential applications due to rigidity, chemical resistance, transparency, and thermal stability.

Purpose of the Study:

  • Synthesize polyketones with saturated fused bicyclic repeating units.
  • Explore radical stitching polymerization for novel polymer architectures.

Main Methods:

  • Radical stitching polymerization of styryl vinyl ketones.
  • Chain-growth polymerization under free radical conditions.
  • Alternating copolymerization with 1-styryl-2-vinylbenzenes.

Main Results:

  • Successful synthesis of polyketones with high stitching efficiency.
  • Demonstrated the first alternating stitching copolymerization of two different monomers.
  • Obtained polymers exhibit promising thermal properties and high transparency.

Conclusions:

  • Radical stitching polymerization is an effective method for synthesizing novel polyketones.
  • The developed method enables the creation of polymers with desirable properties like thermal stability and transparency.