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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,...
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,...
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,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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...
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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Video Experimental Relacionado

Updated: Jul 12, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Síntesis de polímeros bidimensionales en su síntesis.

S I Stupp, S Son, H C Lin

    Science (New York, N.Y.)
    |January 1, 1993
    PubMed
    Resumen

    Los investigadores desarrollaron un nuevo método para crear polímeros bidimensionales (2D) a granel. Estas nuevas láminas moleculares exhiben una mayor estabilidad térmica y temporal en comparación con los polímeros 1D tradicionales, allanando el camino para materiales orgánicos avanzados.

    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.
    • Química supramolecular de las moléculas.

    Sus antecedentes:

    • Los polímeros tradicionales existen como cadenas unidimensionales (1D).
    • El desarrollo de métodos para crear polímeros de mayor dimensión es un área activa de investigación.
    • La exploración de nuevas arquitecturas puede conducir a materiales con propiedades mejoradas.

    Objetivo del estudio:

    • Describir una vía sintética para la producción a granel de polímeros bidimensionales (2D).
    • Para caracterizar la estructura y las propiedades de estas nuevas hojas de polímero 2D.
    • Para comparar la estabilidad de polímeros 2D con polímeros 1D análogos.

    Principales métodos:

    • Utilizando un precursor oligomérico quiral con sitios reactivos específicos.

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  • Empleando la auto-organización y el reconocimiento molecular para la formación de capas.
  • Catenación a través de dos reacciones de sutura distintas para formar polímeros bidimensional 2D.
  • Caracterización utilizando técnicas para determinar el peso molecular, el grosor y la organización estructural.

    • Principales resultados:

    • Síntesis exitosa de polímeros 2D de doble capa con alto peso molecular (millones).
    • Se logró un grosor de monodispersión de 50,2 angstroms para las láminas moleculares 2D.
    • Se ha demostrado la autoorganización en capas mediante el reconocimiento molecular.
    • Se observó la formación de cristales individuales a temperatura ambiente y de cristales líquidos de esmético a temperaturas más altas.
    • Las películas de polímero 2D mostraron una estabilidad térmica y temporal superior a las películas de polímero 1D.

    Conclusiones:

    • Se ha establecido una ruta sintética escalable para la producción a granel de polímeros 2D.
    • La arquitectura 2D mejora significativamente la estabilidad del material en comparación con las contrapartes 1D.
    • Este trabajo abre caminos para el desarrollo de materiales orgánicos de próxima generación con un mejor rendimiento.