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

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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

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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

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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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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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Radical Chain-Growth Polymerization: Mechanism01:09

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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...
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Polimerización de la expansión del anillo impulsada por la concentración a través de procesos de transferencia de

Meredith N Pomfret1, Nicholas P Serck1, Lucy P Miller1

  • 1Department of Chemistry and Molecular Engineering and Science Institute, University of Washington, Seattle, Washington 98115, United States.

Journal of the American Chemical Society
|May 27, 2025
PubMed
Resumen
Este resumen es generado por máquina.

La polimerización por metástasis de expansión de anillo (REMP) utilizando el catalizador CB6 produce polímeros cíclicos de alta masa molar inicialmente, luego disminuye. Este estudio revela que el CB6 actúa como iniciador y agente de transferencia de anillos, permitiendo un mejor control de la REMP.

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Área de la Ciencia:

  • Química de los polímeros
  • Catálisis
  • Ciencias de los materiales

Sus antecedentes:

  • La polimerización por metástasis de expansión de anillo (REMP) es vital para crear arquitecturas de polímeros cíclicos.
  • El catalizador cíclico de Ru-benzilideno CB6 ofrece una mayor estabilidad y tasas de polimerización.
  • CB6 exhibe una evolución inusual de la masa molar, disminuyendo con el tiempo.

Objetivo del estudio:

  • Para comprender mecanicamente los perfiles de polimerización de CB6 en REMP.
  • Para investigar los pasos de transferencia de anillos responsables del comportamiento único de la masa molar de CB6.
  • Establecer el control de REMP para el desarrollo de nuevos materiales cíclicos.

Principales métodos:

  • Estudios mecánicos de la polimerización CB6.
  • Análisis de los perfiles de evolución de la masa molar.
  • Investigación de los efectos de la concentración de la reacción.

Principales resultados:

  • CB6 actúa como un iniciador y un agente de transferencia de anillo catalítico.
  • Se identificó una relación intrincada entre la concentración de reacción y la masa molar.
  • Los polímeros cíclicos de alta masa molar se forman temprano, seguidos de una disminución.

Conclusiones:

  • Se logró una comprensión mecánica más profunda de REMP con CB6.
  • El control sobre REMP se mejora a través de la comprensión del comportamiento del catalizador.
  • Este trabajo proporciona un conjunto de herramientas para optimizar el diseño de catalizadores y crear nuevos materiales cíclicos.