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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Olefin Metathesis Polymerization: Overview

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...

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

Properties of Organometallic Compounds

Properties of Organometallic Compounds

Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.

Ziegler–Natta Chain-Growth Polymerization: Overview

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...

Pericyclic Reactions: Introduction

Pericyclic Reactions: Introduction

Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic rearrangements are...

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Synthesis of a Water-soluble Metal–Organic Complex Array

Synthesis of a Water-soluble Metal–Organic Complex Array

Published on: October 8, 2016

Polímeros cíclicos metalo-supramoleculares y subramoleculares.

Ke Zhang¹, Yongping Zha, Bo Peng

¹Department of Polymer Science and Engineering, University of Massachusetts , Amherst, Massachusetts 01003, United States.

Journal of the American Chemical Society

|August 13, 2013

Resumen

Este resumen es generado por máquina.

Los investigadores crearon nuevos polímeros de cepillo cíclico utilizando las interacciones metalo-supramoleculares. Este avance permite la visualización directa de estas estructuras poliméricas únicas, abriendo nuevas vías para materiales avanzados.

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Área de la Ciencia:

Química Macromolecular La química macromolecular es una de las ciencias más importantes de la vida.
Química supramolecular de las moléculas.
La ciencia de los polímeros es la ciencia de los polímeros.

Sus antecedentes:

Los polímeros de cepillo cíclicos son una nueva topología macromolecular.
La combinación de polímeros de cepillo cíclicos con interacciones metalo-supramoleculares presenta nuevas posibilidades de materiales.

Objetivo del estudio:

Para sintetizar nuevos polímeros de cepillo cíclico mediante la integración de las interacciones metalo-supramoleculares.
Explorar el potencial de estas nuevas arquitecturas para el desarrollo de materiales avanzados.

Principales métodos:

Síntesis de una plantilla cíclica universal con una columna vertebral de polinorboreno a través de la polimerización de la metátesis de expansión de anillo.
Modificación de la plantilla con terpyridine, un synthon quelatante de metales.
Utilizando cadenas laterales de terpiridina para la creación de cepillos y geles de polímero cíclico.

Principales resultados:

Construcción exitosa de nuevos polímeros de cepillo cíclico a través del ensamblaje metalo-supramolecular.
La funcionalidad metalo-supramolecular permitió la visualización directa de polímeros de cepillo cíclicos utilizando microscopía electrónica de transmisión.
Demostró la viabilidad de crear cepillos y geles de polímero cíclico.

Conclusiones:

Este trabajo es pionero en la combinación de la topología del polímero de cepillo cíclico con las interacciones metalo-supramoleculares.
La capacidad de visualizar estas estructuras abre nuevas direcciones de investigación.
Se espera que este enfoque facilite la creación de diversas arquitecturas basadas en polímeros cíclicos y nuevos materiales.