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Videos de Conceptos Relacionados

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.3K
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...
4.3K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.4K
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...
3.4K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.4K
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.
9.4K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.4K
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...
2.4K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.8K
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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Updated: Jan 15, 2026

Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

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Más allá de la polimerización RAFT tradicional: estrategias emergentes y perspectivas futuras; Una tercera

Vianna F Jafari1, James L Grace1, Jiajia Li2

  • 1Polymer Science Group, Department of Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria, Australia.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|January 14, 2026
PubMed
Resumen

La polimerización por transferencia reversible de adición-fragmentación (RAFT) avanza con la síntesis impulsada por IA y la despolimerización para plásticos sostenibles. Esta revisión cubre las innovaciones de 2020-2025 en la síntesis de polímeros de precisión.

Palabras clave:
polimerización controlada/vivafotoquímicaestructuras de polímerostransferencia de adición-fragmentación reversible (RAFT)

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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Área de la Ciencia:

  • Química de polímeros
  • Ciencia de materiales
  • Síntesis orgánica

Sus antecedentes:

  • La polimerización por transferencia de adición-fragmentación reversible (RAFT), desarrollada en 1998, ofrece un control preciso sobre la síntesis de polímeros.
  • Los últimos años han sido testigos de avances significativos, ampliando su utilidad más allá de los métodos tradicionales.

Objetivo del estudio:

  • Revisar las últimas innovaciones en polimerización RAFT no tradicional de 2020 a 2025.
  • Destacar las tendencias emergentes y el potencial futuro en la síntesis de polímeros de precisión y materiales sostenibles.

Principales métodos:

  • Revisión de la literatura científica reciente (2020-2025) centrada en la polimerización RAFT.
  • Análisis de nuevas técnicas de activación, plataformas de síntesis inteligentes y estrategias de despolimerización.

Principales resultados:

  • Integración de RAFT con inteligencia artificial para el descubrimiento autónomo de polímeros y la síntesis de alto rendimiento.
  • Desarrollo de nuevos métodos de despolimerización RAFT para el reciclaje eficaz de plásticos.
  • Expansión de las aplicaciones RAFT a diversos campos de la ciencia de materiales.

Conclusiones:

  • La polimerización RAFT continúa evolucionando, ofreciendo un control mejorado y nuevas aplicaciones.
  • Las direcciones futuras incluyen el diseño de polímeros impulsado por IA y las contribuciones a la economía circular a través de la despolimerización.