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Related Concept Videos

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

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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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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
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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 species into...
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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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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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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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Updated: Mar 28, 2026

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Reactions and Polymerizations at the Liquid-Liquid Interface.

Keti Piradashvili1, Evandro M Alexandrino1, Frederik R Wurm1

  • 1Max Planck Institute for Polymer Research , Ackermannweg 10, 55128 Mainz, Germany.

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Summary
This summary is machine-generated.

Reactions at liquid-liquid interfaces enhance kinetics and yields. This review covers organic chemistry and heterophase polymerization for producing nano- and microcarriers.

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Area of Science:

  • Interface chemistry
  • Polymer science

Background:

  • Reactions confined at liquid-liquid interfaces offer advantages.
  • These include improved reaction kinetics, higher yields, and selectivity.
  • Immiscible systems facilitate product separation and heat dissipation.

Purpose of the Study:

  • To review reactions and polymerizations at the interface of two immiscible liquids.
  • To present applications of heterophase polymerization in emulsions.
  • To highlight the production of nano- and microcarriers.

Main Methods:

  • Overview of low molecular weight organic chemistry at interfaces.
  • Discussion of heterophase polymerization strategies.
  • Examination of emulsion-based systems.

Main Results:

  • Confinement at interfaces accelerates reactions.
  • Phase-transfer catalysts can be employed.
  • Heterophase polymerization in emulsions is effective for producing carriers.

Conclusions:

  • Interface-mediated reactions and polymerizations are efficient.
  • This strategy enables the production of nano- and microcarriers for diverse applications.
  • Liquid-liquid interfaces offer a versatile platform for chemical synthesis.