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Videos de Conceptos Relacionados

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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...
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...
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...
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,...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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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Updated: May 17, 2026

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

Polimerización metalo-supramolecular bidimensional: hacia polímeros multi-hilo controlados por el tamaño.

Jinne Adisoejoso1, Yang Li, Jun Liu

  • 1Department of Physics, The Hong Kong University of Science and Technology, Clear Water Bay, China.

Journal of the American Chemical Society
|October 19, 2012
PubMed
Resumen

Los investigadores desarrollaron polímeros metalo-supramoleculares de múltiples hebras utilizando porfirinas funcionalizadas con piridil en una superficie dorada. Se descubrió un nuevo mecanismo de crecimiento de la cadena, que permite el control de la longitud y anchura del polímero mediante el ajuste de la temperatura y la adición de moduladores.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Synthesis of a Water-soluble Metal–Organic Complex Array

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

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Área de la Ciencia:

  • Química supramolecular de las moléculas.
  • Ciencia de los materiales Ciencia de los materiales.
  • Ciencias de la superficie Ciencias de la superficie.

Sus antecedentes:

  • Los polímeros metalo-supramoleculares ofrecen propiedades sintonizables a través del autoensamblaje impulsado por la coordinación.
  • La comprensión de los mecanismos de polimerización a nivel de una sola molécula es crucial para el diseño de materiales precisos.

Objetivo del estudio:

  • Investigar el autoensamblaje de polímeros metalo-supramoleculares de múltiples hebras en una superficie Au{111}.
  • Para dilucidar el mecanismo de polimerización y explorar métodos para controlar las dimensiones del polímero.

Principales métodos:

  • Autoensamblaje de derivados de porfirina funcionalizados con piridil en una superficie Au.
  • La coordinación mediante el uso de enlaces piridil-Cu-piridil.
  • Caracterización con resolución de una sola molécula utilizando microscopía de túnel de barrido (STM).

Principales resultados:

  • El autoensamblaje exitoso de polímeros metalo-supramoleculares de múltiples hebras.
  • Descubrimiento de un nuevo mecanismo de polimerización de la cadena de crecimiento.
  • Control demostrado de la longitud y anchura del polímero mediante la manipulación de la temperatura de crecimiento y los moduladores moleculares.

Conclusiones:

  • El estudio revela un nuevo mecanismo de crecimiento de la cadena para la formación de polímeros metalo-supramoleculares en superficies.
  • El control preciso de la arquitectura del polímero se puede lograr a través del ajuste ambiental y molecular.