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関連する概念動画

Radical Autoxidation01:20

Radical Autoxidation

2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
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

2.5K
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...
2.5K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.0K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.7K
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.
7.7K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
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...
1.9K

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Updated: Jun 2, 2025

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Published on: April 22, 2016

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酸素駆動型原子移転基ポリメリゼーション

Yuxuan Du1, Zhe Chen1, Zhikang Xie1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.

Journal of the American Chemical Society
|January 16, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,アルキルボランを用いた酸素駆動型原子移転ラジカルポリメリゼーション (ATRP) を導入し,酸素除去の必要性を排除し,先進的な材料の露天条件下で制御されたポリメリゼーションを可能にします.

さらに関連する動画

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Last Updated: Jun 2, 2025

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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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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科学分野:

  • ポリマー化学
  • 材料科学

背景:

  • 伝統的な原子移転ラジカルポリメリゼーション (ATRP) は,ラジカル消火と触媒の酸化を防ぐために厳格な酸素排除を必要とします.
  • 酸素の存在は,通常,根幹種と銅触媒を干渉することによって,ポリメリゼーションを阻害します.

研究 の 目的:

  • 酸素を阻害剤ではなく重要な成分として利用する新しいATRP方法を開発する.
  • 様々な条件と用途に適合する多用途で堅固なポリメリゼーション技術を実証する.

主な方法:

  • ATRPを駆動するためにアルキルボラン化合物,特にトリエチルボラン (Et3B) とその空気安定複合体 (Et3B-DMAP) を利用した.
  • 有機媒介と水性媒介の両方で開いた空気の条件下でポリメリゼーション実験を行った.

主要な成果:

  • 分散度が低 (Đは1.11) で,分子量が制御されている,明確に定義されたポリマーが得られる.
  • 広範なモノマー互換性とタンパク質-ポリマー結合物の成功合成が実証された.
  • 空気条件下でナノ粒子とシリコンウエーフェルの表面修正を可能にします.

結論:

  • ポリメリゼーションプロモーターとして酸素を活用する新しい酸素駆動ATRPプラットフォームを開発しました.
  • この方法は,精密ポリメリゼーションのための頑丈で,多用途で,空気耐性のアプローチを提供します.
  • この技術は,材料科学,生物医学,および表面工学における応用に重要な可能性を秘めています.