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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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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 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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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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Promover la segunda generación armónica espontánea a través de la organogelación

A Belén Marco1, Fátima Aparicio2, Lara Faour2

  • 1Departamento de Química Orgánica, ICMA, Universidad de Zaragoza-CSIC , 50009 Zaragoza, Spain.

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Se sintetizó un nuevo organogelador para la óptica no lineal. El material resultante exhibe una generación de segundo armónico (SHG) estable y espontánea sin preprocesamiento, lo que simplifica las aplicaciones del material SHG.

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química
  • Óptica

Sus antecedentes:

  • Los materiales ópticos no lineales (NLO) son cruciales para las tecnologías ópticas.
  • El logro de una segunda generación armónica (SHG) eficiente a menudo requiere métodos de alineación complejos.
  • El desarrollo de materiales NLO intrínsecamente alineados es un desafío significativo.

Objetivo del estudio:

  • Para sintetizar un nuevo organogelator basado en el cromóforo rojo disperso.
  • Investigar las propiedades espontáneas de SHG de los xerogeles supramoleculares resultantes.
  • Demostrar un enfoque simplificado para la preparación del material NLO.

Principales métodos:

  • Se empleó un procedimiento de síntesis en tres pasos para crear el organogelador.
  • Se indujo la formación de gel supramolecular.
  • Se midió la respuesta de segunda generación armónica (SHG) de los xerogeles.
  • La estabilidad de la respuesta SHG fue monitoreada durante varios meses.

Principales resultados:

  • El organogelador sintetizado formó xerogeles estables.
  • Estos xerogeles exhibieron generación espontánea de segundo armónico (SHG) sin ningún preprocesamiento.
  • La actividad de SHG observada se mantuvo estable durante varios meses.
  • La organización estructural intrínseca, impulsada por las interacciones intermoleculares, promovió la alineación no centrosimétrica NLO-activa.

Conclusiones:

  • Se desarrolló un método sencillo y eficiente para crear materiales activos con SHG.
  • El organogelador proporciona una plataforma prometedora para el diseño intrínseco del material NLO.
  • Este enfoque evita técnicas externas complejas para la alineación del dipolo, ofreciendo una ventaja significativa sobre los métodos convencionales.