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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
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

1.9K
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...
1.9K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.2K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K

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Updated: May 25, 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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リング拡張メタテシス 閉じ込め下でのポリメリゼーション

Patrick Probst1, Moritz Lindemann1, Johanna R Bruckner2

  • 1Institute of Polymer Chemistry, University of Stuttgart, Pfaffenwaldring 55, Stuttgart 70569, Germany.

Journal of the American Chemical Society
|February 26, 2025
PubMed
まとめ
この要約は機械生成です。

モリブデン複合体をオーダーしたメソポラス・シリカで固定すると,リング膨張メタテシスのポリメリゼーションが促進される. この閉じ込めは,制御されたステレオ選択性を持つ低分子量サイクルポリマーの合成を可能にします.

さらに関連する動画

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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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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Last Updated: May 25, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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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:

  • 有機金属化学
  • ポリマー化学
  • 材料科学

背景:

  • 移行金属複合体を用いた触媒は,ポリマー合成に不可欠です.
  • 触媒を多孔性物質に閉じ込めると 反応性と選択性が変化します
  • オーダーメイド・メソポラス・シリカ (OMS) は,触媒の固定化のために調節可能な毛穴サイズを提供します.

研究 の 目的:

  • OMS内のカチオンモリブデンアルキリジンN-ヘテロサイクリックカルベン (NHC) 複合体を固定する.
  • 輪膨張メタテシスポリメリゼーション (REMP) に対する毛穴封じ込めの効果を調査する.
  • ポリマー分子量とステレオ選択性に対する閉じ込めの影響を調査する.

主な方法:

  • モリブデンNHC複合体の合成と特徴付け [Mo ((C-p-OMeC6H4) ((OCMe ((CF3) 2) 2 ((IMes)) ] B ((ArF4).
  • 孔のサイズが異なる OMS に複合体を固定する (66,56,28 Å).
  • シス・サイクロクトン (cCOE),1,5-サイクロクトアディエン (COD), (+) -2,3-エンド,エクソ・ディカルボメトキシノルボーン-5-エネ ((+) -DCMNBE),および2-メチル-2-フェニルプロプ-1-エネ (MPCP) を含むサイクルオレフィンの環膨張メタテシスポリマー化 (REMP).
  • マトリックス・アシスタント・レーザー・デソルプション・イオン化・タイム・オブ・フライト (MALDI-TOF) 質量スペクトロメトリを用いたポリマー製品の分析.

主要な成果:

  • OMSの毛穴内のモリブデン複合体の選択的固定化
  • REMPに強い閉じ込め効果が観察され,高濃度モノマーでも低分子量サイクルポリマーが生じる.
  • MALDI-TOFによって確認されたサイクルポリマーの独占的形成
  • 閉じ込めによるZ選択性とシスシンディオスペシフィシティの強化

結論:

  • モリブデンNHC触媒をOMSに閉じ込めることは,REMPを制御するための効果的な戦略です.
  • OMSの孔の大きさはポリメリゼーション結果に大きく影響し,特異な性質を持つサイクルポリマーの合成を可能にします.
  • このアプローチは,触媒の閉じ込めを通して,ポリマー構造とステレオ化学を正確に制御するための経路を提供します.