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関連する概念動画

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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.
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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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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...
2.7K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.8K
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...
2.8K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.0K
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...
2.0K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
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...
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Polymers02:34

Polymers

36.9K
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...
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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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固有の伸縮性および形状記憶性ポリマーによる原子移転基質ポリメリゼーション

Chen Wang1, Ruoqing Zhao1, Xiaozhong Bao1

  • 1State Key Laboratory of Flexible Electronics (LOFE) & Institute of Flexible Electronics (IFE), Northwestern Polytechnical University, Xi'an, China.

Macromolecular rapid communications
|August 28, 2025
PubMed
まとめ

研究者は,長寿命の室温光性 (RTP) の新しい無形有機ポリマーを開発しました. これらの材料は 優れた伸縮性や形状記憶力を備えており セキュリティ,画像,センサーの分野で 応用が進んでいます

キーワード:
ATRP についてブロックコポリマー室温の光形状メモリ

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Last Updated: Sep 9, 2025

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

  • 材料科学
  • ポリマー化学
  • 光電子機器

背景:

  • 室温光性 (RTP) の無形有機ポリマーは,高度なアプリケーションに希望があります.
  • RTPと 伸縮性や形状記憶などの 優れた機械的特性を持つポリマーの実現には 課題が残っています

研究 の 目的:

  • バイオミテック特性を持つナノ構造のRTPブロックコポリマーを開発する.
  • 光ポリマーの伸縮性と形状記憶性能を向上させるため

主な方法:

  • ブロックコポリマーを合成するために,原子移転基ポリメリゼーション (ATRP) が使用された.
  • ミュッセルの皮質を模倣したマイクロフェーズ分離設計が採用されました.
  • この戦略は,幅広いスペクトルの放射のための様々な染色体でテストされました.

主要な成果:

  • ブロックコポリマーは2相形状を示し,優れた機械的および形状記憶性能をもたらしました.
  • この設計は染色体の移動性を制限し,非放射性崩壊を抑制し,RTPの効率を高めました.
  • 1000ミリ秒までの寿命で効率的なRTPを達成し,高い伸縮性 (> 700%のストレンス) と形状メモリ.

結論:

  • ナノ構造のRTPブロックコポリマーのバイオミミクリングは,高度な機能的な材料のための実行可能な戦略を提供します.
  • このアプローチは,制御されたナノ構造,広範囲の放出,優れたRTP性能を含む調整可能な特性を可能にします.
  • 開発されたポリマーは,情報セキュリティ,生物画像,光電子,センサーの重要な可能性を秘めています.