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関連する概念動画

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
2.1K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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...
2.3K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.5K
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...
3.5K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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...
2.0K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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...
1.9K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.8K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.8K

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Updated: Jul 2, 2025

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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ペンデントグループ活性化によるメタクリlateポリマーの大量デポリメリゼーション

Rhys W Hughes1, Megan E Lott1, Isabella S Zastrow1

  • 1George & Josephine Butler Polymer Research Laboratory, Department of Chemistry, Center for Macromolecular Science & Engineering, University of Florida, Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|February 21, 2024
PubMed
まとめ
この要約は機械生成です。

この研究では,特定のモノマーを組み込み,ポリメチルメタクリlate (PMMA) を脱ポリメリ化する効率的な方法が導入されています. このプロセスは,超高分子量PMMAでも95%以上をメチルメタクリレート (MMA) に戻し,持続可能なポリマー材料の開発を可能にします.

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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科学分野:

  • ポリマー化学
  • 持続可能な材料科学
  • 化学工学

背景:

  • ポリメチルメタクリlate (PMMA) の従来の根性ポリメリゼーションは,効率的な脱ポリメリゼーションに課題を提示します.
  • 既存のデポリメリゼーション方法は,高分子量ポリマーと苦戦したり,触媒を必要とします.
  • PMMAのようなポリマー材料をリサイクルし 再利用するための持続可能な方法の必要性が増しています

研究 の 目的:

  • PMMAコポリマーのための効率的な,触媒のない脱ポリマー化方法を開発する.
  • 超高分子量変種とネットワークを含む機能化されたPMMAの脱ポリマー化を調査する.
  • 持続可能なポリメタクリラート材料の製造の可能性を証明する.

主な方法:

  • 低モル%のフタリミドエステルを含むモノマーを併用したPMMA共ポリマーの合成
  • 合成されたPMMAコポリマーを触媒なしで大量分解する.
  • 副産物の脱ポリマー化効率と分子量の特徴付け
  • ポリメタクリlate ネットワークへの方法の拡張

主要な成果:

  • 機能化されたPMMAからメチルメタクリlate (MMA) に>95%の復元を達成しました.
  • 超高分子量PMMA (10^6-10^7g/mol) の量的な脱ポリマー化が実証されている.
  • 生産されたポリマーの副産物は,チェーンエンドで開始された方法と比較して著しく低い分子量を持っています.
  • ポリメタクリlate ネットワークの高度なデポリメリゼーションを展示しました.

結論:

  • 開発された方法は,PMMAの脱ポリマー化に効率的で持続可能なアプローチを提供します.
  • このテクニックは高分子量ポリマーやネットワークに 挑戦しても効果的です
  • このアプローチは持続可能なポリマーの科学と応用を進めるための大きな希望です.