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Related Concept Videos

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...
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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 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 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 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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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Microdroplet-Mediated Radical Polymerization.

Kyoungmun Lee1, Hyun-Ro Lee1, Young Hun Kim1

  • 1Department of Chemical and Biomolecular Engineering, Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

ACS Central Science
|October 3, 2022
PubMed
Summary
This summary is machine-generated.

This study shows oil-confined aqueous microdroplets can synthesize polymers using interfacial energy. This method enables controlled radical polymerization and chain extension, opening new avenues in microdroplet chemistry.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Micrometer-sized aqueous droplets act as unique reactors for specific chemical reactions.
  • Current limitations include low reactant concentrations (nM to μM) and unknown reactions outside droplets.

Purpose of the Study:

  • To demonstrate polymer synthesis in oil-confined aqueous microdroplets at high concentrations (mM to M).
  • To investigate the generation and transport of hydroxyl radicals at the oil/water interface for polymerization.
  • To explore applications in controlled radical polymerization and chain extension.

Main Methods:

  • Utilizing oil-confined aqueous microdroplets as reaction compartments.
  • Generating hydroxyl radicals at the oil/water interface.
  • Sequential monomer addition for triblock copolymer synthesis.
  • Investigating interfacial radical transport for polymerization in the oil phase.

Main Results:

  • Successful synthesis of polymers at high reactant concentrations (mM to M) within microdroplets.
  • Achieved controlled radical polymerization properties and triblock copolymer formation with tapered interfaces.
  • Demonstrated polymerization in the continuous oil phase via interfacial hydroxyl radical transport.
  • Successfully applied interfacial phenomena for chain extension of hydrophilic polymers with oil-soluble monomers.

Conclusions:

  • Oil-confined aqueous microdroplets can convert interfacial energy into polymeric materials synthesis.
  • This approach enables controlled radical polymerization and interfacial chain extension without invasive initiators.
  • The findings have significant implications for microdroplet chemistry and polymerization in cellular biochemistry.