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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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Step-Growth Polymerization: Overview01:03

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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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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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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 of a...
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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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Anionic Chain-Growth Polymerization: Mechanism01:04

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The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Plataforma de aminoácidos para poli(ésteres de amino): polimerización por apertura de anillo controlada,

Shi Ou1, Yu Dai1, Zhaolin Ding1

  • 1College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, P. R. China.

Angewandte Chemie (International ed. in English)
|January 12, 2026
PubMed
Resumen

Los investigadores desarrollaron una plataforma versátil para sintetizar diversos poli(ésteres de amino) (PAE) a partir de aminoácidos a través de monómeros de azalactona. Este método permite propiedades de polímero ajustables y una despolimerización eficiente, ofreciendo información sobre el diseño de polímeros.

Palabras clave:
AzalactonaPoli(éster de amino)Polimerizabilidad/despolimerizabilidadPolimerización por apertura de anilloRelación estructura-actividad

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Área de la Ciencia:

  • Química de polímeros
  • Síntesis orgánica
  • Ciencia de materiales

Sus antecedentes:

  • Los poli(ésteres de amino) (PAE) ofrecen biodegradabilidad y funcionalidad ajustable, pero carecen de plataformas de síntesis versátiles.
  • El desarrollo de métodos eficientes para crear diversas bibliotecas de PAE es crucial para expandir sus aplicaciones.

Objetivo del estudio:

  • Establecer una plataforma fácilmente disponible y versátil para sintetizar diversos PAE a partir de aminoácidos.
  • Investigar las relaciones estructura-actividad que rigen la polimerización por apertura de anillo (ROP) y la despolimerización de monómeros de azalactona.

Principales métodos:

  • Se sintetizaron monómeros de azalactona a partir de aminoácidos renovables y epóxidos en un proceso de dos pasos.
  • Se utilizó ROP controlada organocatalítica para polimerizar monómeros de azalactona.
  • Se realizaron estudios de despolimerización para evaluar la recuperación de monómeros y la cinética.
  • Se investigó la influencia de la estructura del monómero (N-sustituyentes, sustituyentes del núcleo, estereoconfiguración, tamaño del anillo) en la polimerización y despolimerización.

Principales resultados:

  • Se sintetizó con éxito una gama de monómeros de azalactona con propiedades adaptadas.
  • Se logró la ROP controlada de monómeros de azalactona, produciendo diversos PAE.
  • Se demostró la despolimerización cuantitativa de PAE en sus monómeros originales con cinética de primer orden.
  • Se estableció una correlación inversa entre las constantes de velocidad de despolimerización y polimerización.
  • Se mostró la capacidad de regular la polimerizabilidad y la despolimerizabilidad ajustando la estructura de la azalactona y la temperatura límite (-20 a 37 °C).

Conclusiones:

  • La plataforma desarrollada proporciona una ruta versátil hacia diversos PAE a partir de aminoácidos.
  • La estructura del monómero impacta significativamente la reactividad de la ROP, la polimerizabilidad y la despolimerizabilidad.
  • La temperatura límite ajustable ofrece control sobre la polimerización y la despolimerización, permitiendo sistemas de polímeros reciclables.