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Videos de Conceptos Relacionados

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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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Radical Chain-Growth Polymerization: Overview01:10

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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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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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Radical Chain-Growth Polymerization: Chain Branching01:17

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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...
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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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Polymers02:34

Polymers

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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...
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Polímeros intrínsecamente elásticos y con memoria de forma mediante polimerización radical por transferencia atómica

Chen Wang1, Ruoqing Zhao1, Xiaozhong Bao1

  • 1State Key Laboratory of Flexible Electronics (LOFE) & Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, China.

Macromolecular rapid communications
|August 28, 2025
PubMed
Resumen

Los investigadores desarrollaron nuevos polímeros orgánicos amorfos con fosforescencia a temperatura ambiente (RTP) de larga duración. Estos materiales exhiben una excelente extensibilidad y memoria de forma, avanzando aplicaciones en seguridad, imágenes y sensores.

Palabras clave:
El ATRPCopolímeros de bloqueFosforescencia a temperatura ambientememoria de la forma

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Área de la Ciencia:

  • Ciencias de los materiales
  • Química de los polímeros
  • Optoelectrónica y sus derivados

Sus antecedentes:

  • Los polímeros orgánicos amorfos con fosforescencia a temperatura ambiente (RTP) son prometedores para aplicaciones avanzadas.
  • Quedan retos para lograr polímeros con RTP y excelentes propiedades mecánicas como la extensibilidad y la memoria de forma.

Objetivo del estudio:

  • Desarrollar copolímeros de bloque RTP nanoestructurados con propiedades biomiméticas.
  • Para mejorar la extensibilidad y el rendimiento de la memoria de forma en polímeros fosforescentes.

Principales métodos:

  • Se utilizó la polimerización radical de transferencia atómica (ATRP) para sintetizar copolímeros de bloque.
  • Se empleó un diseño separado por microfasas que imitaba las cutículas de los mejillones.
  • La estrategia se probó con varios cromóforos para la emisión de amplio espectro.

Principales resultados:

  • Los copolímeros de bloque exhibieron una morfología de dos fases, lo que condujo a un excelente rendimiento mecánico y de memoria de forma.
  • El diseño restringía la movilidad de los cromóforos, suprimiendo el decaimiento no radiativo y mejorando la eficiencia de la RTP.
  • Se obtiene una RTP eficiente con una vida útil de hasta 1000 ms, una alta extensibilidad (> 700% de deformación) y una memoria de forma.

Conclusiones:

  • Los copolímeros de bloque RTP nanoestructurados que imitan las cutículas de mejillón ofrecen una estrategia viable para materiales funcionales avanzados.
  • Este enfoque permite propiedades sintonizables que incluyen nanoestructura controlada, emisión de amplio espectro y rendimiento RTP superior.
  • Los polímeros desarrollados tienen un potencial significativo para la seguridad de la información, las imágenes biológicas, la optoelectrónica y los sensores.