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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
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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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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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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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Updated: May 5, 2026

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Reversible Addition-Fragmentation Chain-Transfer Aqueous Emulsion Polymerization Observed by Transmission Electron

Megan E Lott1, Nathan D Rosenmann2, Cabell B Eades1

  • 1George & Josephine Butler Polymer Research Laboratory, Center for Macromolecular Science & Engineering, Department of Chemistry, University of Florida, Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
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Summary
This summary is machine-generated.

This study visualizes emulsion polymerization using advanced microscopy, revealing nanoscale particle evolution and complex morphologies. This offers a new platform for designing colloidal materials in solution-phase polymerization.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Colloid Science

Background:

  • Emulsion polymerization is crucial for producing latexes for coatings and adhesives.
  • Mechanistic understanding is limited by a lack of suitable in-situ observational tools.

Purpose of the Study:

  • To visualize the nanoscale evolution during reversible addition-fragmentation chain-transfer (RAFT) aqueous emulsion polymerization.
  • To bridge the gap between kinetic models and particle formation dynamics.

Main Methods:

  • Combined liquid-phase transmission electron microscopy (LPTEM) and dry-state transmission electron microscopy (TEM).
  • Utilized dynamic light scattering for nanoscale observation.
  • Employed a poly(ethylene glycol)-based macro-chain transfer agent for stabilization.

Main Results:

  • Captured the progression of emulsion polymerization mechanisms, including micellar nucleation and particle growth.
  • Observed rare higher-order morphologies and morphological transitions.
  • Provided direct visualization of nanoscale changes in monomer droplets and particles.

Conclusions:

  • Established a new platform for direct visualization in solution-phase polymerization.
  • Enables mechanistically guided design of advanced colloidal materials.
  • Addresses a key observational barrier in emulsion polymerization research.