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関連する概念動画

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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関連する実験動画

Updated: Jul 3, 2026

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures
08:30

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

Published on: January 19, 2019

ジャヌス型デンドリマー状のポリエチレン酸化物 (PEO) です.

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
まとめ

新しい方法では,表面化学が異なるジャヌス型デンドリマー型ポリエチレン酸化物 (PEO) を合成しています. これにより,直角的な機能化が可能になり,高度なアプリケーションに合わせた特性を有する複雑なマクロ分子を作成します.

科学分野:

  • ポリマー化学のポリマー化学について
  • 超分子化学 超分子化学
  • 材料科学 材料科学とは

背景:

  • デンドリマー型ポリマーは,高度なアプリケーションのためのユニークなアーキテクチャを提供します.
  • 複雑なマクロ分子における表面機能の制御は,依然として課題です.

研究 の 目的:

  • ジャヌス型デンドリマー型ポリエチレン酸化物 (PEO) のための新しい合成方法論を開発する.
  • これらのジャヌス型PEOの異なる表面の直角な機能化を達成するために.

主な方法:

  • エチレン酸化物 (EO) のアニオン環開きポリメリゼーション (AROP) のヘテロ機能的イニシアターを使用した異なる合成経路を使用しました.
  • 2つの異なるデンドロンを構築するために選択的分岐剤を組み込みました.
  • 繰り返し成長したポリマー世代と,正方形に機能した周辺グループ.

主要な成果:

  • ジャヌス型デンドリマー状のPEOを6世代まで合成し,分子量は約300kg/molで,顔あたり64個の周辺群を成功させた.
  • ヒドロキシル基,三次アミノ基,二硫化基,アジド基,アセチレン基との正方形の機能化が実証されています.
  • クリック化学によるデンドリマー型のPEOsのネックレスのような組み立てを達成しました.

さらに関連する動画

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
09:09

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

Published on: February 27, 2016

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

関連する実験動画

Last Updated: Jul 3, 2026

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures
08:30

Gene-therapy Inspired Polycation Coating for Protection of DNA Origami Nanostructures

Published on: January 19, 2019

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
09:09

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

Published on: February 27, 2016

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
11:42

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

Published on: June 20, 2019

結論:

  • 開発された方法論は,精密に制御された表面機能を持つジャヌス型デンドリティックPEOsへの多用途な経路を提供します.
  • これらの材料は,薬物投与,ナノテクノロジー,セルフアセンブリにおける応用の可能性を秘めています.