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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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.3K
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.
Many natural and synthetic polymers are produced by...
4.3K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.4K
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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.9K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.1K
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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Related Experiment Video

Updated: Jan 16, 2026

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Synthesis of Janus Particles by Seeded Emulsion Polymerization.

Yingying Wu1,2, Yingchun Long2, Guolin Zhang1

  • 1Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, China.

Molecules (Basel, Switzerland)
|September 27, 2025
PubMed
Summary
This summary is machine-generated.

Janus particles (JPs) offer great potential across various fields. This review details how seeded emulsion polymerization enables fine structural control and large-scale synthesis of these anisotropic materials.

Keywords:
Janus particlesinterfacephase separationseeded emulsion polymerization

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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Area of Science:

  • Material Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Janus particles (JPs) possess unique anisotropic properties due to distinct chemical or physical partitioning.
  • JPs have broad applications in material science, biomedicine, energy, and environmental sectors.
  • Controlled synthesis and structural fine-tuning of JPs remain critical challenges.

Purpose of the Study:

  • To comprehensively review the preparation of Janus particles using seeded emulsion polymerization.
  • To systematically summarize the mechanisms and key parameters influencing Janus structure formation.
  • To emphasize the impact of seed characteristics, polymerization conditions, and component selection on JP morphology and anisotropy.

Main Methods:

  • Review of seeded emulsion polymerization techniques for Janus particle fabrication.
  • Systematic analysis of process mechanisms and critical parameters.
  • Focus on the influence of seed properties, polymerization conditions, and material selection.

Main Results:

  • Seeded emulsion polymerization is an effective method for controlled Janus particle synthesis.
  • Key parameters influencing Janus structure formation have been identified.
  • The study highlights the significant effects of seed characteristics, polymerization conditions, and component choice on particle morphology.

Conclusions:

  • Seeded emulsion polymerization offers a viable route for the large-scale, controlled synthesis of Janus particles.
  • Understanding the interplay between process parameters and material components is crucial for tailoring JP properties.
  • This review provides valuable insights for advancing Janus particle research and applications.