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関連する概念動画

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,...
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.
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,...
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...
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,...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...

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関連する実験動画

Updated: May 31, 2026

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

自己組織的表面誘発ポリメリゼーション:複雑な機能システムへの容易なアクセス.

Naomi Sakai1, Marco Lista, Oksana Kel

  • 1Department of Organic Chemistry, University of Geneva, Geneva 1211, Switzerland. naomi.sakai@unige.ch

Journal of the American Chemical Society
|June 18, 2011
PubMed
まとめ

オーダーされた,機能的な材料の簡単な作成のために,自己組織表面誘発ポリメリゼーション (SOSIP) を開発しました. この方法は,乱雑な材料と比較して優れた活性を持つ高品質のポリマーフィルムを生成します.

さらに関連する動画

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
14:37

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles

Published on: July 6, 2012

Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
06:48

Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles

Published on: June 14, 2024

関連する実験動画

Last Updated: May 31, 2026

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
14:37

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles

Published on: July 6, 2012

Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles
06:48

Synthesis and Characterization of Self-Assembled Metal-Organic Framework Monolayers Using Polymer-Coated Particles

Published on: June 14, 2024

科学分野:

  • マテリアルサイエンス 材料科学
  • ポリマー化学のポリマー化学について
  • 表面科学とは,地表科学である.

背景:

  • 先進的な機能材料の開発には,複雑なシステムの制御された合成が必要です.
  • 表面にオーダーされたポリマー構造を作成するための既存の方法は,複雑で時間がかかる可能性があります.

研究 の 目的:

  • 透明な酸化物表面上で,秩序と方向性のある機能的なポリマーシステムを作成するためのユーザーフレンドリーな方法を導入する.
  • 高品質の機能的材料を合成するための自己組織表面誘発ポリメリゼーション (SOSIP) の有効性を実証する.

主な方法:

  • モノメアの自己組織化とリング開き型ジスルファイド交換ポリメリゼーションを組み合わせる.
  • ポリマーの成長のための基板として透明な酸化物表面を使用します.

主要な成果:

  • SOSIPは,滑らかで再活性化可能な表面を持つ厚いポリマーフィルムの迅速な合成を可能にします.
  • この方法は,高い精度と最小限の欠陥で長距離オーダーを達成します.
  • オリエンテッド4コンポーネント・レドックス・グラデーションを持つパンクロマティック・フォトシステムの作成が実証された.
  • SOSIPで生成されたアーキテクチャは,無秩序なコントロールよりも著しく高いアクティビティを示します.

結論:

  • SOSIPは,高度な機能的な材料を製造するための効率的で汎用的な方法です.
  • SOSIPによって生成された制御された,秩序付けられた構造は,素材の性能を向上させます.
  • このアプローチは,次世代の機能的材料の開発を容易にする.