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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: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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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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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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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.0K
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 species into...
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Related Experiment Video

Updated: Nov 5, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Interfacial Polymerization at the Alkane/Ionic Liquid Interface.

Chang Liu1, Jing Yang2, Bian-Bian Guo1

  • 1MOE Key Laboratory of Macromolecular Synthesis and Functionalization, Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province, Department of Polymer Science and Engineering, Zhejiang University, Hangzhou, 310027, China.

Angewandte Chemie (International Ed. in English)
|May 19, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed interfacial polymerization at the alkane/ionic liquid interface (IP@AILI) for creating ultrathin polyamide nanofilms. This novel method overcomes limitations of water-based systems, enabling diverse monomer use and advanced molecular sieving applications.

Keywords:
interfacial polymerizationionic liquidsmembranesnanofilmspolyamides

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Separation Science

Background:

  • Interfacial polymerization is key for ultrathin polymer films used in molecular sieving.
  • Conventional methods are limited to alkane-water interfaces, restricting monomer choice and causing side reactions.

Purpose of the Study:

  • To develop a versatile interfacial polymerization method beyond the alkane-water system.
  • To synthesize task-specific polyamide nanofilms using diversified amines.

Main Methods:

  • Interfacial polymerization at the alkane/ionic liquid interface (IP@AILI).
  • Utilizing ionic liquid as a universal solvent for various amines.
  • Investigating polymerization mechanism via thermodynamic partitioning and kinetic monitoring.

Main Results:

  • Successful synthesis of polyamide nanofilms with tunable pore sizes.
  • Demonstrated the diffusion of acyl chloride into ionic liquid as the polymerization trigger.
  • Achieved high permeability and selectivity in separation processes.

Conclusions:

  • IP@AILI offers a robust platform for creating advanced polyamide nanofilms.
  • This method expands the scope of interfacial polymerization to non-water-soluble monomers.
  • The developed nanofilms show significant potential for molecular sieving and separation technologies.