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Videos de Conceptos Relacionados

Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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...
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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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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.3K
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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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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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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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Flujo de trabajo circular para termoinstalaciones: diseño de unidad de repetición activable para polimerización

Zhenchuang Xu1,2, Kecheng Wang1,2, Benjamin A Suslick1,2

  • 1Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, United States.

Journal of the American Chemical Society
|February 25, 2025
PubMed
Resumen
Este resumen es generado por máquina.

Este estudio introduce un nuevo método para reciclar los termofijos de polidiciclopentadieno (pDCPD) de alto rendimiento. Una nueva unidad activable permite la deconstrucción y la reactivación de un solo recipiente, lo que permite la regeneración del material con propiedades conservadas.

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Área de la Ciencia:

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

Sus antecedentes:

  • Los materiales termoestables ofrecen un rendimiento excelente, pero se enfrentan a desafíos de reciclaje debido a su naturaleza interconectada.
  • La fabricación sostenible y el reprocesamiento al final de la vida útil son fundamentales para los materiales avanzados.

Objetivo del estudio:

  • Desarrollar una nueva estrategia para la regeneración de materiales termoestables de polidiciclopentadieno de alto rendimiento (pDCPD).
  • Para permitir un flujo de trabajo circular para termofijos a través de un proceso de deconstrucción-reactivación.

Principales métodos:

  • Utilizó una "unidad de repetición activable" de norborneno-furano (NBF) en el pDCPD.
  • Se utiliza la polimerización por metástasis de apertura de anillo frontal (FROMP) para el curado inicial.
  • Implementó una estrategia de deconstrucción y reactivación de un solo recipiente que incluye la cicloadición de Diels-Alder con benzina.

Principales resultados:

  • La unidad NBF permaneció intacta durante el FROMP y fue reactiva para la posterior deconstrucción.
  • Los materiales pDCPD regenerados conservan propiedades clave como la temperatura de transición de vidrio, la rigidez y la resistencia al rendimiento.
  • El flujo de trabajo circular demostró una recuperación y reactivación de materiales efectivas.

Conclusiones:

  • La estrategia desarrollada permite la regeneración sostenible de los termofijos de alto rendimiento.
  • Este enfoque aborda los desafíos críticos en materia de circularidad y reduce el impacto ambiental.
  • El método de deconstrucción-reactivación de un solo recipiente ofrece una vía viable para el reciclaje termoestable.