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Videos de Conceptos Relacionados

Polymers02:34

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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 acceptor.
Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...

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A 'Plug and Play' Method to Create Water-dispersible Nanoassemblies Containing an Amphiphilic Polymer, Organic Dyes and Upconverting Nanoparticles
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Los polifluorenos con cadenas laterales de dendrón de polifenileno: hacia polímeros no agregadores y emisores de luz.

S Setayesh1, A C Grimsdale, T Weil

  • 1Contribution from the Max-Planck-Institute for Polymer Research, Ackermannweg 10, D-55128 Mainz, Germany.

Journal of the American Chemical Society
|July 18, 2001
PubMed
Resumen

Los investigadores desarrollaron un nuevo polímero emisor de azul utilizando sustitutos de dendrímeros voluminosos para evitar la agregación. Esta innovación permite la emisión de luz azul pura y diodos orgánicos emisores de luz (OLED) eficientes con bajos voltajes de funcionamiento.

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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Electrónica orgánica y electrónica orgánica.

Sus antecedentes:

  • Los polifluorenos son materiales prometedores para los diodos orgánicos emisores de luz (OLED) debido a su eficiente emisión azul.
  • La agregación de cadenas de polifluoreno puede conducir a emisiones indeseables de larga longitud de onda y reducir el rendimiento del dispositivo.
  • El control de la morfología del polímero es crucial para lograr una emisión azul pura y OLED estables.

Objetivo del estudio:

  • Para sintetizar un nuevo derivado de polifluoreno con la formación de agregados suprimidos para la emisión de azul puro.
  • Para investigar el efecto de los sustitutos voluminosos de dendrimero de polifenileno sobre las propiedades de agregación y emisión del polifluoreno.
  • Para evaluar el rendimiento del nuevo polifluoreno en un dispositivo de diodo orgánico emisor de luz (OLED).

Principales métodos:

  • Síntesis de un nuevo derivado del polifluoreno (PF) que incorpora grandes cadenas laterales de dendrímeros de polifenileno.
  • Caracterización utilizando espectroscopia de absorción y emisión para analizar las propiedades ópticas.
  • Modelado molecular para evaluar el impacto conformacional de los sustitutos de dendrimero en la columna vertebral del polímero.
  • Fabricación y prueba de un dispositivo de diodo orgánico emisor de luz (OLED) utilizando el polímero sintetizado.

Principales resultados:

  • El derivado de polifluoreno sintetizado exhibió una emisión azul pura, atribuida a la supresión de los agregados emisores de larga longitud de onda por sustitutos de dendrimeros voluminosos.
  • Los análisis espectroscópicos y computacionales confirmaron que las cadenas laterales dendrímeras no indujeron torsión significativa en la columna vertebral del polifluoreno.
  • Se prepararon nuevos polifluorenos con diferentes sustitutos de 9,9-diarilo para identificar el tamaño mínimo de sustituto requerido para una supresión efectiva de la agregación.
  • Un diodo orgánico emisor de luz (OLED) fabricado con el nuevo polifluoreno demostró una emisión eficiente de luz azul con voltajes de inicio por debajo de 4 V.

Conclusiones:

  • Los sustitutos voluminosos de dendrímeros de polifenileno son efectivos para prevenir la agregación en los polifluorenos, lo que lleva a una emisión azul pura.
  • El diseño molecular de los polifluorenos se puede adaptar para lograr propiedades ópticas específicas y suprimir la formación de agregados indeseables.
  • El material de polifluoreno desarrollado muestra un potencial significativo para su aplicación en diodos orgánicos emisores de luz (OLED) azules de bajo voltaje y alto rendimiento.