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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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...
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.
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...
Structure of Conjugated Dienes01:16

Structure of Conjugated Dienes

Introduction
Conjugated dienes are compounds characterized by the presence of alternating double and single bonds. In a conjugated system like 1,3-butadiene, the unhybridized 2p orbital on each carbon overlaps continuously, allowing the π electrons to be delocalized across the entire molecule. In contrast, this type of overlap does not occur in cumulated and isolated dienes, such as 2,3-pentadiene and 1,4-pentadiene, respectively. Instead, the π electrons remain localized between the double...
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,...

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Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures
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Published on: January 19, 2019

Dendrimero tipo Janus de tipo poli (óxido de etileno) s.

Xiaoshuang Feng1, Daniel Taton, Emmanuel Ibarboure

  • 1Laboratoire de Chimie des Polymeres Organiques, Université Bordeaux 1, ENSCPB 16, Avenue Pey Berland, 33607 Pessac cedex, France.

Journal of the American Chemical Society
|August 7, 2008
PubMed
Resumen

Un nuevo método sintetiza polioxidos de etileno (PEOs) de tipo Janus, parecidos a dendrímeros, con distintas composiciones químicas superficiales. Esto permite la funcionalización ortogonal, creando macromoléculas complejas con propiedades personalizadas para aplicaciones avanzadas.

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Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Química supramolecular de las moléculas.
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los polímeros similares a los dendrímeros ofrecen arquitecturas únicas para aplicaciones avanzadas.
  • El control de la funcionalidad superficial en macromoléculas complejas sigue siendo un desafío.

Objetivo del estudio:

  • Desarrollar una nueva metodología sintética para el tipo de Janus dendrimer-como el óxido de polietileno (PEOs).
  • Para lograr la funcionalización ortogonal de las distintas superficies de estos PEOs tipo Janus.

Principales métodos:

  • Utilizó una vía sintética divergente empleando un iniciador heterofuncional para la polimerización de apertura de anillos aniónicos (AROP) de óxido de etileno (EO).
  • Agentes de ramificación selectiva incorporados para construir dos dendrones distintos.
  • Iterativamente crecieron las generaciones de polímeros y los grupos periféricos funcionalizados ortogonalmente.

Principales resultados:

  • Con éxito sintetizó PEOs similares a dendrímeros de tipo Janus hasta la sexta generación, con un peso molecular de aproximadamente 300 kg / mol y 64 grupos periféricos por cara.
  • Se ha demostrado la funcionalidad ortogonal con grupos hidroxilo, amino terciario, disulfuro, azido y acetileno.
  • Se logró un ensamblaje similar a un collar de PEOs similares a dendrímeros a través de la química de clic.

Conclusiones:

  • La metodología desarrollada proporciona una ruta versátil a los PEOs dendríticos de tipo Janus con funcionalidades de superficie controladas con precisión.
  • Estos materiales tienen potencial para aplicaciones en la administración de medicamentos, nanotecnología y autoensamblaje.