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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Polymers02:34

Polymers

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.0K
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: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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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 species into...
3.2K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
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...
2.7K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.0K
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...
3.0K

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DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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機械化学的に活性な隠された長さを持つポリマー

Yancong Tian1, Xiaodong Cao2, Xun Li3

  • 1Department of Chemistry, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.

Journal of the American Chemical Society
|October 16, 2020
PubMed
まとめ
この要約は機械生成です。

研究者達は 機械化学反応性を備えた 新しいポリマーチェーンを開発しました この技術革新は,鎖の折れることなくストレスを軽減し,エネルギー分散を向上させることで,機械的性質を大幅に改善します.

さらに関連する動画

Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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関連する実験動画

Last Updated: Dec 5, 2025

DNA Nanotubes as a Versatile Tool to Study Semiflexible Polymers
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Covalent Attachment of Single Molecules for AFM-based Force Spectroscopy
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold
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Fabrication of a Bioactive, PCL-based "Self-fitting" Shape Memory Polymer Scaffold

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科学分野:

  • ポリマー化学
  • 材料科学
  • 機械化学

背景:

  • ポリマーチェーンに隠された長さを組み込むことは,局所的なストレスの緩和を可能にすることで,機械的性質を高めます.
  • 現在の設計は犠牲の絆に焦点を当てていますが,隠された長さの内部の機械化学反応性ではありません.

研究 の 目的:

  • ポリマー鎖の隠された長さに機械化学反応性を統合する利点を示す.
  • ポリマーの機械的性質を向上させる新しいメカニコフォアを導入する.

主な方法:

  • (Z) -2,3-ディフェニルサイクロブテン-1,4-ディカルボキシラートをマクロサイクリックシナマートジマーに統合する新しいメカノフォアの合成.
  • ポリマーの機械的伸縮とDFT計算で,エネルギー分散と断裂メカニズムを分析する.
  • 機械化学反応を研究し,計算モデルを検証するための超音波溶液.

主要な成果:

  • ポリマーの長さを2倍以上伸ばせば 断裂は起こらない
  • シンプルなポリエステルと比較して,新しいメカノフォールは,鎖破裂エネルギーで11倍もの増加を示しています.
  • 約3nNまでの高いエネルギー分散能力が維持されます.

結論:

  • 隠された長さに機械化学反応性を加えることで,従来の設計よりも大きな利点があります.
  • 開発されたメカノフォアは優れた機械的特性とエネルギー分散を提供します.
  • この研究は計算モデルを検証し,単一鎖の力を定量化するための方法を提案しています.