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Videos de Conceptos Relacionados

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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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.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
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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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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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Radical Chain-Growth Polymerization: Overview01:10

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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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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Los polialquenámeros como aditivos de goteo para la polimerización de la metátesis de apertura de anillos: un

Jeffrey C Foster1, Joshua T Damron1, Jackie Zheng1,2

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Journal of the American Chemical Society
|October 29, 2024
PubMed
Resumen

Este estudio introduce un nuevo método para reciclar los polialquenámeros de desecho en materiales avanzados. Al usarlos en la polimerización de la metástasis de apertura de anillos, logramos la síntesis de polímeros controlada y la mejora del material.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales
  • Química sustentable

Sus antecedentes:

  • Los polialquenámeros de desecho, como el polibutadieno, presentan desafíos de reciclaje.
  • Los métodos actuales de reciclaje a menudo implican una compleja deconstrucción o funcionalidad.
  • La polimerización por metástasis de apertura de anillo (ROMP) ofrece una plataforma versátil para la síntesis de polímeros.

Objetivo del estudio:

  • Desarrollar una estrategia específica para el reciclaje de residuos de polialquenos.
  • Utilización de los polialquenámeros como aditivos de entrada en el ROMP.
  • Crear nuevos materiales con mejor rendimiento a partir de polímeros reciclados.

Principales métodos:

  • El uso de polialquenámeros como agentes de transferencia de cadena en el ROMP.
  • Investigación de la ROMP de los monómeros cíclicos de las olefinas con polialquenámeros modelo.
  • Traducir el método al polibutadieno y al estireno de butadieno acrilonitrilo (ABS) comerciales.

Principales resultados:

  • Se logró un buen control del peso molecular durante la ROMP.
  • Catalizador de bajo contenido de rutenio activado.
  • Incorporación eficiente y cuantitativa demostrada de polialquenámeros en nuevos polímeros.
  • Heredó las propiedades termomecánicas deseables de los polialquenos reciclados.

Conclusiones:

  • La estrategia desarrollada ofrece una vía eficiente y sencilla desde el punto de vista operativo para el reciclado de polialquenos.
  • Este método ofrece una alternativa viable a las estrategias de reciclaje de polímeros existentes.
  • El enfoque facilita la creación de materiales con ventajas de rendimiento a partir de residuos de polímeros.