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関連する概念動画

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

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

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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...
2.7K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.3K
The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
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
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.1K
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.
8.1K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.4K
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...
3.4K

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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触媒挿入ポリメリゼーションによる分子的に定義されたポリオレフィンビトリマー

Lukas Odenwald1, Florian P Wimmer1, Nina K Mast1

  • 1Chair of Chemical Materials Science, Department of Chemistry, University of Konstanz, 78457 Konstanz, Germany.

Journal of the American Chemical Society
|July 15, 2022
PubMed
まとめ

この研究は,単調な分子組成を持つ機能化されたポリエチレンを作り出すための新しい方法を導入し,再生可能で溶媒耐性のある材料特性を高めるガラスを生み出します.

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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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Last Updated: Sep 4, 2025

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Synthesis of Terpolymers at Mild Temperatures Using Dynamic Sulfur Bonds in PolyS-Divinylbenzene
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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科学分野:

  • ポリマー化学
  • 材料科学
  • キャタリシス

背景:

  • ビトリマーは,クロスリンクされた材料の特性と熱可塑性の組み合わせを提供します.
  • ポリエチレンを機能化するための既存の方法は,異質な鎖の組成につながります.
  • この異質性は,その結果生じるガラスの性能と再利用性を制限する.

研究 の 目的:

  • 同型機能化されたポリエチレンを合成する方法を開発する.
  • 材料の性能と再利用性を向上させる
  • すべてのポリマーチェーンをネットワーク構造に効率的に組み込むことを可能にします.

主な方法:

  • 直接触媒挿入ポリメリゼーションにより,クロスリンク可能なグループ (アリルボロンエステルまたはアセタル保護グループ) を組み込む.
  • 機能化されたポリエチレン鎖の合成,連鎖内の均質な分布と終端グループ濃縮.
  • 溶媒耐性および再利用性を含む,構成シミュレーションによるガラスの特性.

主要な成果:

  • ポリエチレンチェーン内のクロスリンク可能なグループの均質な分布を達成した.
  • 鎖の末端に反応基の濃縮が観察され,完全なネットワークの組み込みが容易になりました.
  • 溶媒耐性と均一な分子構成による完全な再利用性を含む,強化されたヴィトリマー特性.

結論:

  • 触媒挿入ポリメリゼーションは,ホモゲーネスな機能化されたポリエチレンに優越した経路を提供する.
  • 均一な分子組成は,頑丈で,浸出しない,再利用可能なガラスの材料の達成の鍵です.
  • 開発された方法は,高性能で持続可能なポリマーネットワークの構築を可能にします.