このページは機械翻訳されています。他のページは英語で表示される場合があります。 View in English

ケテニニウム媒介によるポストポリメリゼーション改変:ポリアクリラミドの新興特性を解き放つ

  • 0Department of Chemistry, University of Kansas, Lawrence, Kansas 66045, United States.

|

|

まとめ

この要約は機械生成です。

我々は,アミド活性化を用いたポリマー改変のための新しい方法を開発し,活性化されていないポリ (アクリルアミド) の直接的なポストポリメリゼーション改変を可能にしました.このアプローチは,機能的な共ポリマーを作成し,分解可能な合成ポリマーを設計するための経路を導入します.

科学分野

  • ポリマー化学
  • 有機合成
  • 材料科学

背景

  • ポリメリゼーション後の改変 (PPM) は,直接的なポリメリゼーションを超えて,ポリマーの機能性を高めます.
  • ポリアクリルアミドの既存のPPMは,しばしば厳しい条件または活性化モノマーを必要とし,アクセシビリティを制限します.

研究 の 目的

  • 活性化されていないポリアクリラミドに対する直接的なPPM戦略を策定する.
  • 機能的で分解可能な合成ポリマーを作るための新しい方法を導入する.

主な方法

  • トリフローロメタン硫化水素 (Tf2O) を用いてアミド活性化してケテニミニウムイオン中間物質を形成する.
  • ペンダントアミドをアリルケトンに変換するための中間物質の核性解消.
  • 生成されたポリ ((アクリラミド-コビニルケトン) コポリマーの分子特性.

主要な成果

  • 活性化されていないポリアクリラミドの直接PPMを成功させた.
  • 調節可能な機能を持つランダムなコポリマーの形成.
  • アリルビニルケトンを含むコポリマーの制御された光分解が,UV照射下で実証された.

結論

  • アミド活性化戦略は,ポリアクリラミド機能化のための新しい経路を提供します.
  • この方法は,活性化されていないポリマーに対するPPMの範囲を拡大します.
  • 開発されたコポリマーは 調節可能な性質を持つ分解性合成材料を設計するための経路を提供します

関連する概念動画

Anionic Chain-Growth Polymerization: Overview 01:20

2.1K

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: Acyclic Diene Metathesis (ADMET) 00:53

1.9K

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...

Cationic Chain-Growth Polymerization: Mechanism 00:57

2.3K

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...

Radical Chain-Growth Polymerization: Mechanism 01:09

2.5K

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...

Anionic Chain-Growth Polymerization: Mechanism 01:04

2.0K

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...

Olefin Metathesis Polymerization: Overview 01:13

2.0K

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...