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関連する概念動画

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

2.6K
Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
2.6K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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,...
2.1K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
2.2K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.0K
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.
8.0K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.0K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.0K
Base-Catalyzed Ring-Opening of Epoxides02:26

Base-Catalyzed Ring-Opening of Epoxides

8.7K
Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
8.7K

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Updated: Jul 26, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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化学的にリサイクル可能なポリマーシステム 核愛性芳香環開封ポリメリゼーション

Yong-Liang Su1, Liang Yue2, Huan Tran3

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, Georgia 30332, United States.

Journal of the American Chemical Society
|June 12, 2023
PubMed
まとめ

化学的に再利用可能なポリチオエーターは,ダイナミックな核愛性芳香代替化学を用いて開発された. これらの新しいポリマーは調整可能な特性と効率的な脱ポリメリゼーションを提供し,持続可能なポリマー科学を進めている.

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

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関連する実験動画

Last Updated: Jul 26, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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科学分野:

  • ポリマー科学
  • 材料化学
  • 持続可能な化学

背景:

  • 望ましい性質を持つ化学的にリサイクル可能なポリマーの開発は大きな課題です.
  • リバーシブルな化学反応は効率的なポリメリゼーションとデポリメリゼーションサイクルに不可欠です.

研究 の 目的:

  • 化学的に再利用可能なポリエーテルシステムを報告する
  • 核愛性芳香置換 (SNAr) による鎖成長環開きポリメリゼーションのための明確に定義されたモノマープラットフォームを実証する.

主な方法:

  • ダイナミック・ヌクレオフィル・アロマティック・スプチテーション (SNAr) の化学を用いた.
  • 簡単に入手できるベンゾチオカン (BT) モノマーをポリメリゼーションに用いる.
  • チェーン・成長・リング・オープニング・ポリメリゼーション・メカニズムを調査した.

主要な成果:

  • 迅速なポリメリゼーションを達成し,数分で完了します.
  • プロパティの調整のためのペンダントの機能を簡単にカスタマイズすることが示されました.
  • 商業用熱プラスチックに匹敵する性能を持つポリエーテル材料を得ている.
  • 高収量で元のモノマーに戻すのに成功したポリマー.

結論:

  • 報告されたポリチオエーテル系は,SNAr鎖成長環開きポリメリゼーションのための明確に定義されたモノマープラットフォームの最初の例である.
  • この研究は,調整可能な特性と効率的なリサイクル性を持つ持続可能なポリマーへの実行可能な経路を提供します.