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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Polymers02:34

Polymers

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 properties that they exhibit. Additionally,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.

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Related Experiment Video

Updated: May 15, 2026

Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins
08:04

Assembling Molecular Shuttles Powered by Reversibly Attached Kinesins

Published on: January 26, 2019

Self-healing polymers via supramolecular forces.

Florian Herbst1, Diana Döhler, Philipp Michael

  • 1Institute of Chemistry, Martin-Luther-University Halle-Wittenberg, Von-Danckelmann-Platz 4, D-06120 Halle (Saale), Germany.

Macromolecular Rapid Communications
|January 15, 2013
PubMed
Summary
This summary is machine-generated.

Scientists are developing self-healing polymers using reversible, noncovalent bonds. This approach leverages supramolecular chemistry for dynamic networks, enabling materials to repair themselves effectively.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Polymers are crucial 20th-century materials, driving technological advancements.
  • There is a significant demand for self-healing or self-repairing polymers.
  • Supramolecular self-healing materials utilize transient, noncovalent bonds to form dynamic networks.

Purpose of the Study:

  • To review recent advancements in supramolecular polymers for self-healing applications.
  • To discuss the role of reversibility and dynamics in designing self-healing materials.
  • To highlight the advantages of various supramolecular forces in creating self-healing polymers.

Main Methods:

  • Review of existing literature on supramolecular polymers.
  • Analysis of self-healing mechanisms based on noncovalent interactions.
  • Categorization of self-healing polymers by bonding type (hydrogen bonding, π-π interactions, ionomers, coordinative bonds).

Main Results:

  • Supramolecular polymers based on hydrogen bonding, π-π interactions, ionomers, and coordinative bonds demonstrate self-healing capabilities.
  • Reversibility and dynamics of the polymer network are critical for effective self-healing.
  • Noncovalent interactions offer versatility in designing self-healing materials.

Conclusions:

  • Supramolecular chemistry provides a powerful platform for developing advanced self-healing polymers.
  • The choice of noncovalent bonds significantly influences the healing efficiency and material properties.
  • These dynamic materials hold great promise for future technological applications requiring autonomous repair.