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関連する概念動画

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.4K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.6K
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...
2.6K
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
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.9K
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.
7.9K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K

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関連する実験動画

Updated: Jul 9, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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リバーシブル・デアクティベーション・ラジカル・ポリメリゼーションによるマクロモレキュラー・エンジニアリングによる多機能室温の光ポリマー

Ruoqing Zhao1, Chen Wang1, Keer Huang1

  • 1Frontiers Science Center for Flexible Electronics (FSCFE) & Shaanxi Institute of Flexible Electronics (SIFE), Northwestern Polytechnical University, Xi'an 710072, China.

Journal of the American Chemical Society
|November 30, 2023
PubMed
まとめ

研究者らは,高度な室温光ポリマー (RTP) のための新しいグラデントコポリマー (GCP) を開発した. これらの機能的な材料は 調節可能な機械的特性と 光の放出を犠牲にすることなく 自己修復能力を提供します

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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関連する実験動画

Last Updated: Jul 9, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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科学分野:

  • ポリマー科学と工学
  • 材料化学
  • フォト物理学

背景:

  • 制御された構造と複数の機能を持つ室温光ポリマー (RTP) の開発は困難です.
  • 既存のRTPポリマーには,調節可能な機械的特性や自己治癒能力が欠けていることが多い.

研究 の 目的:

  • よく定義されたマクロ分子構造と強化された機能を持つRTPポリマーを合成する.
  • 伸縮性,固有の治癒性,そして持続的なRTP性能を持つ材料を作成します.

主な方法:

  • グラデーションコポリマー (GCP) のアーキテクチャを作成するために,可逆的な無活性化ラジカルポリメリゼーションを使用した.
  • ハードとフレキシブルなセグメントを組み合わせた制御された異質性を持つGCP.
  • 多相ナノ構造に自己組み立てを調査し,機械的および光物理的特性を特徴付けました.

主要な成果:

  • 5.0%から221.7%までの断裂時の伸縮と0.5から225.0MPaまでのヤングのモジュールで,調整可能な機械性能を達成した.
  • 優れたRTP性能と固有の治癒性を示した.
  • 伸縮した状態で光の放出を維持し,多機能性を示します.

結論:

  • グラデントコポリマーアーキテクチャは,高度なRTPポリマーを設計するための多用途のプラットフォームを提供します.
  • 開発された材料は,調節可能な機械特性,自己治癒性,強固な光性のユニークな組み合わせを示しています.
  • この研究は,様々な用途の機能的な光材料に新しい道を開きます.