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関連する概念動画

Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.5K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
2.5K
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
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.2K
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...
4.2K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.3K
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...
3.3K
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

2.4K
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...
2.4K

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関連する実験動画

Updated: Jan 8, 2026

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

Published on: October 29, 2013

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階層的架橋高分子ネットワークに向けた非同期反応

Dandan Hu1, Zhipeng Zhang2, Chunfeng Ma1

  • 1Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou, P. R. China.

Chemistry (Weinheim an der Bergstrasse, Germany)
|December 24, 2025
PubMed
まとめ

研究者らは、非同期反応と水素結合を用いて高度なポリマーイオンゲルネットワークを設計しました。これにより、柔軟なセンシング、エレクトロルミネッセンスデバイス、およびナノジェネレータ向けの蛍光性を持つ、強靭なイオンゲルが作成されました。

キーワード:
非同期反応イオンゲルネットワーク構造ポリウレア超分子相互作用

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Preparation of DNA-crosslinked Polyacrylamide Hydrogels
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Preparation of DNA-crosslinked Polyacrylamide Hydrogels

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Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation
15:33

Microwave-assisted Functionalization of Polyethylene glycol and On-resin Peptides for Use in Chain Polymerizations and Hydrogel Formation

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Preparation of DNA-crosslinked Polyacrylamide Hydrogels
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科学分野:

  • 材料科学
  • 高分子化学
  • ソフトエレクトロニクス

背景:

  • イオンゲルはソフトエレクトロニクスにとって重要であり、ネットワーク構造が性能を決定します。
  • 化学設計は、イオンゲルネットワークアーキテクチャを最適化するための経路を提供します。

研究 の 目的:

  • 高分子イオンゲルネットワークを設計するための新しい戦略を提示すること。
  • 階層的な架橋構造を持つイオンゲルの合成と特性を実証すること。

主な方法:

  • 官能基の差次的化学反応性を利用した非同期反応。
  • 高分岐クラスターの自発的集合のための水素結合相互作用の利用。
  • 階層的な架橋高分子ネットワークの構築。

主要な成果:

  • 高分岐クラスターと階層的ネットワークの自発的形成を達成しました。
  • 高強度、高靭性、低ヒステリシス、蛍光性を示すポリウレアイオンゲルを開発しました。
  • 柔軟なセンシング、エレクトロルミネッセンスデバイス、ナノジェネレータでの応用を実証しました。

結論:

  • 開発されたネットワーク設計戦略は、機能化されたイオンゲルを作成するための洞察を提供します。
  • このアプローチにより、高度なアプリケーション向けの高性能イオンゲルを作成できます。
  • 今後の研究では、これらの材料のさらなる開発と応用を探求できます。