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

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

2.5K
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...
2.5K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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...
2.0K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.7K
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.
7.7K
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
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.4K
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...
2.4K

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Updated: Jun 9, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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環開きメタテシスポリメリゼーションのドロップイン添加物としてのポリアルケナマー:有望なアップサイクリングパラダイム

Jeffrey C Foster1, Joshua T Damron1, Jackie Zheng1,2

  • 1Chemical Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, United States.

Journal of the American Chemical Society
|October 29, 2024
PubMed
まとめ

この研究は,廃棄物ポリアルケナマーを高度な材料に再利用するための新しい方法を導入しています. 環開きメタテシスのポリメリゼーションで 制御されたポリマー合成と 材料の強化を実現します

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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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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions

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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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Particles without a Box: Brush-first Synthesis of Photodegradable PEG Star Polymers under Ambient Conditions
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科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能な化学

背景:

  • ポリアルケナマー廃棄物はポリブタジエンのようにリサイクルに問題があります.
  • 現在のアップサイクリング方法は,しばしば複雑な解体や機能化を伴う.
  • リングオープニングメタテシスポリメリゼーション (ROMP) は,ポリマー合成のための汎用的なプラットフォームを提供します.

研究 の 目的:

  • 廃棄物ポリアルケナマーのアップサイクリングのための明確な戦略を開発する.
  • ポリアルケナマーをROMPのドロップイン添加物として利用する.
  • リサイクルされたポリマーから性能を向上した新しい材料を作成します.

主な方法:

  • 鎖移転剤としてROMPでポリアルケナマーを使用する.
  • モデルポリアルケナマーを用いたサイクリックオレフィンモノメアのROMPを調査する.
  • 商用ポリブタディエンとアクリロニトリルブタディエンスタイレン (ABS) に変換する.

主要な成果:

  • ROMPでは分子量制御が良好でした.
  • 低ルテニウム触媒の負荷を有効にした.
  • ポリアルケナマーを新しいポリマーに効率的かつ定量的に組み込むことが実証された.
  • アップサイクルのポリアルケナマーから望ましい熱力学的性質を継承した.

結論:

  • 開発された戦略は,ポリアルケナマーアップサイクリングの効率的で操作的に単純な経路を提供します.
  • この方法は,既存のポリマーリサイクル戦略に有効な代替手段を提供します.
  • このアプローチは,廃棄ポリマーから性能の高い材料の作成を容易にする.