Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.8K
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...
2.8K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.8K
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...
3.8K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.9K
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...
2.9K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

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

Cationic Chain-Growth Polymerization: Mechanism

2.5K
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...
2.5K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
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...
2.1K

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

Ion-backbone accessibility enables unity doping efficiency in organic electrochemical transistors.

Nature communications·2026
Same author

Thermodynamic Limits to Molecular Doping in Conjugated Polymers: A Perspective on Phase Behavior and Miscibility.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Instability of prevailing small molecule acceptors in organic solar cells toward water/nucleophiles.

Science advances·2026
Same author

Molar Mass Thresholds in the Structural Behavior of Benzodithiophene-Based Semiconducting Polymers.

Macromolecules·2026
Same author

Nonlinear optical quantum communication with a two-dimensional perovskite light source.

The Journal of chemical physics·2026
Same author

RAFT Step-Growth Polymerization via 'Grafting Through'.

ACS polymers Au·2026

関連する実験動画

Updated: Oct 18, 2025

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

3.9K

リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー・ステップ・グロース・ポリメリゼーション

Joji Tanaka1, Noel Edward Archer1, Michael Jeffery Grant1

  • 1Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599, United States.

Journal of the American Chemical Society
|September 28, 2021
PubMed
まとめ

この研究では,RAFTのステップ成長ポリメリゼーションを導入し,ペンダントRAFT剤でユニークなポリマーを作成します. これらのポリマーは分子ブラシを形成したり 線形鎖に変換したりし ポリマーの設計の可能性を高めます

さらに関連する動画

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.4K
Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
08:09

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery

Published on: August 6, 2019

5.9K

関連する実験動画

Last Updated: Oct 18, 2025

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
07:28

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

Published on: February 18, 2022

3.9K
Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
07:28

Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

Published on: November 27, 2015

13.4K
Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
08:09

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery

Published on: August 6, 2019

5.9K

科学分野:

  • ポリマー化学
  • マクロモレキュラー科学

背景:

  • リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー (RAFT) ポリメリゼーションは,ポリマー構造の正確な制御を提供します.
  • ポリマーのバックボーン・チューナビリティの制限は,伝統的なRAFTポリメリゼーションの適用範囲を制限する.
  • 高度なポリマーアーキテクチャの開発には,ポリメリゼーション技術を組み合わせることが不可欠です.

研究 の 目的:

  • RAFTとステップ・グロース・ポリメリゼーションを組み合わせた新しいポリメリゼーション方法を開発する.
  • 調整可能な骨格構造とペンダント反応部位を持つポリマーを作成します.
  • 分子ブラシポリマーの合成とその後の変換を実証する.

主な方法:

  • 単一のモノマーとRAFTエージェントの高度選択的挿入プロセスを利用する.
  • ダブルポリメリゼーション戦略の実施:RAFTの段階的な成長と接ぎ木.
  • ポリメリゼーション後の改変のために,分割可能なバックボーン機能を使用します.

主要な成果:

  • RAFTのステップ・グロース・ポリメリゼーションを成功裏に達成し,各バックボーンユニットにペンダントRAFT剤を付加したポリマーを生成した.
  • ペンダントRAFT剤にサイドチェーンを挿入することで分子ブラシポリマーを合成した.
  • 刺激反応性割れメカニズムを使用して,ブラシのようなポリマーを均一な線形鎖に変換することを実証した.

結論:

  • RAFTのステップ・グロース・ポリメリゼーションは,複雑なポリマー・アーキテクチャを作成するための汎用性のあるプラットフォームを提供します.
  • 開発された方法は,調整可能なサイドチェーンの分子ブラシの合成を可能にします.
  • ポリマー骨格の刺激反応性割れは制御された構造変化を可能にします.