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Related Concept Videos

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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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...
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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: 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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Anionic Chain-Growth Polymerization: Overview01:20

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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

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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.
Many natural and synthetic polymers are produced by...
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Olefin Metathesis Polymerization: Overview01:13

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Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Janus Particles Synthesized via Vapor-Phase Coupling Polymerization Protocol.

Kazuma Kuroiwa1, Kazusa Takeuchi1, Tomoyasu Hirai2,3

  • 1Division of Applied Chemistry, Environmental and Biomedical Engineering, Graduate School of Engineering, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|February 22, 2025
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Summary

Researchers created Janus particles using vapor-phase polymerization of pyrrole on polystyrene particles. These particles self-orient at interfaces, stabilizing armored bubbles in water.

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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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Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Surface Science

Background:

  • Polystyrene (PS) particles are utilized as a platform for creating functionalized materials.
  • Janus particles, with distinct surface properties, offer unique interfacial behaviors.
  • Controlling regioselective surface functionalization is crucial for advanced material design.

Purpose of the Study:

  • To synthesize polystyrene/polypyrrole (PS/PPy) Janus particles via vapor-phase polymerization.
  • To investigate the influence of surface tension on PPy nanolayer coverage and particle contact angles.
  • To demonstrate the interfacial orientation and bubble stabilization capabilities of the synthesized Janus particles.

Main Methods:

  • Vapor-phase polymerization of pyrrole in the presence of PS particles at the air-water interface.
  • Modification of liquid surface tension using isopropanol to study its effect on PPy coverage.
  • Characterization of particle size and interfacial behavior, including contact angle measurements.
  • Demonstration of armored bubble stabilization in an aqueous medium.

Main Results:

  • Successfully formed PS/PPy Janus particles with regioselective PPy nanolayer coverage on the air-contacting surface.
  • PPy nanolayer coverage and particle contact angle decreased with reduced surface tension (isopropanol addition).
  • Pyrrole monomer dissolution in water reduced surface tension, enhancing PS particle wetting post-polymerization.
  • PS/PPy Janus particles with sizes from 5 to 1000 μm were controllably synthesized.
  • Janus particles oriented with hydrophilic PS towards water and hydrophobic PPy towards air at the interface.

Conclusions:

  • Vapor-phase polymerization provides a regioselective method for creating PS/PPy Janus particles.
  • Interfacial properties and particle orientation can be tuned by controlling surface tension and particle size.
  • The synthesized Janus particles effectively stabilize armored bubbles, showcasing potential applications in Pickering stabilization.