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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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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.
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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.
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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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Related Experiment Video

Updated: Jan 3, 2026

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Liquid Metal-Mediated Mechanochemical Polymerization.

Tiansheng Gan1, Stephan Handschuh-Wang1, Wenhui Shang1,2

  • 1College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518055, P. R. China.

Macromolecular Rapid Communications
|November 26, 2019
PubMed
Summary
This summary is machine-generated.

A novel liquid metal-mediated mechanochemical polymerization method uses ultrasound to create polymers from water-soluble monomers. This versatile technique offers oxygen tolerance and reusable materials for advanced polymer synthesis.

Keywords:
dropletsliquid metal polymerizationliquid metalsmechanochemistryultrasound

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Mechanochemistry

Background:

  • Mechanically controlled polymerization is of significant interest for novel synthetic materials.
  • Current methods are limited by material choices and strategies.
  • Developing new polymerization techniques is crucial for materials innovation.

Purpose of the Study:

  • To develop a versatile, air-compatible mechanochemical polymerization method using liquid metals.
  • To enable robust polymer preparation in aqueous solutions.
  • To explore the use of mechanical energy in polymer synthesis.

Main Methods:

  • A liquid metal-mediated mechanochemical polymerization method (LMMMP) was developed.
  • Ultrasonic irradiation was used to simultaneously disrupt liquid metals into droplets and polymerize monomers.
  • The process was conducted in an aqueous solution under air-compatible conditions.

Main Results:

  • The method demonstrated excellent oxygen tolerance due to the continuously generated reactive liquid metal surface.
  • High reaction rates and high molecular weight polymers were achieved from various water-soluble monomers.
  • Liquid metal droplets were successfully reclaimed and reused for polymerization.

Conclusions:

  • The LMMMP provides a versatile platform for synthesizing functional polymers using mechanical energy.
  • This method offers a novel approach for fabricating polymer-liquid metal nanocomposites.
  • The study offers new insights into designing liquid metal-based platforms for polymerization.