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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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Cationic Chain-Growth Polymerization: Mechanism00:57

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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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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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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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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.
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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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Revertir la polimerización RAFT: generación de monómeros casi cuantitativa a través de un enfoque de

Hyun Suk Wang1, Nghia P Truong1, Zhipeng Pei2

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Resumen

Los investigadores desarrollaron un método sin catalizadores para despolimerizar los polimetacrilatos, regenerando los monómeros. Este avance en la polimerización radical reversible permite la reconstrucción del polímero o la formación de un nuevo gel, avanzando en las aplicaciones de la ciencia del polímero.

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Área de la Ciencia:

  • Química de los polímeros
  • Ciencias de los materiales
  • Química orgánica

Sus antecedentes:

  • La inversión de la polimerización radical controlada y la regeneración de monómeros es crucial para la investigación y las aplicaciones de polímeros.
  • El logro de una despolimerización eficiente y libre de catalizadores de los polimetacrilatos ha sido un desafío significativo.

Objetivo del estudio:

  • Informar sobre un nuevo método de despolimerización, altamente eficiente y sin catalizadores, para varios polimetacrilatos.
  • Demostrar la utilidad de los productos despolimerizados para la reconstrucción de polímeros y la síntesis de nuevos materiales.

Principales métodos:

  • Se utilizó la polimerización de transferencia de cadena de adición-fragmentación reversible (RAFT) para sintetizar polimetacrilatos con alta fidelidad de grupo final.
  • Condiciones térmicas aplicadas (120 °C) para generar radicales en el extremo de la cadena, iniciando un proceso de despolimerización rápida.
  • Despolimerización investigada de polimetacrilatos lineales, voluminosos, reticulados y funcionales, incluidos el poli (methacrilato de metilo) y el poli (oligo (etilenglicol) metacrilato de éter de metilo.

Principales resultados:

  • Se ha logrado una despolimerización casi cuantitativa (hasta el 92%) sin catalizadores de diversos polimetacrilatos.
  • Se ha demostrado la reconstrucción exitosa de polímeros lineales a partir de productos despolimerizados.
  • Creó nuevos geles insolubles a partir de materiales despolimerizados, que también eran capaces de someterse a la despolimerización.

Conclusiones:

  • El método de despolimerización desarrollado expande significativamente las capacidades de los polímeros sintetizados a través de la polimerización radical controlada.
  • Este trabajo empuja los límites de la despolimerización de polímeros, revelando intrigantes conocimientos mecanicistas.
  • Los hallazgos permiten nuevas aplicaciones en el reciclaje de polímeros, síntesis y desarrollo de materiales avanzados.