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関連する概念動画

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

10.2K
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.
10.2K
Metal-Ligand Bonds02:51

Metal-Ligand Bonds

25.6K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
25.6K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

4.1K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
4.1K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

1.5K
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
1.5K
Complexometric Titration: Ligands00:43

Complexometric Titration: Ligands

2.6K
Different monodentate and polydentate ligands are used as complexing agents in complexometric titration reactions. The formation of complexes by mono- and bidentate ligands involves two or more intermediate steps, limiting their use as complexing agents. In comparison, polydentate ligands can form complexes with metal ions in a single-step process, facilitating sharper end points. This means polydentate ligands, such as amino carboxylic acid derivatives, are most commonly employed in...
2.6K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.3K
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...
2.3K

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関連する実験動画

Updated: Mar 28, 2026

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

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レドックス活性リガンド:ポリエチレン微細構造を調節する高度なツール

W Curtis Anderson1, Jennifer L Rhinehart1, Andrew G Tennyson2

  • 1Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States.

Journal of the American Chemical Society
|January 2, 2016
PubMed
まとめ

この研究は,リドックス活性触媒がポリメリゼーション中にポリエチレン微細構造を制御できることを示しています. 化学的還元剤を現場で加えることで,枝分かれ密度を30%まで正確に調節できます.

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Characterizing Electron Transport through Living Biofilms
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
09:17

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Characterizing Electron Transport through Living Biofilms
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科学分野:

  • ポリマー化学
  • カタリシス
  • 材料科学

背景:

  • ポリマー特性を調整するために,触媒の改変を通じてポリメリゼーションを制御することが重要です.
  • 局所触媒調節はポリメリゼーション制御にダイナミックなアプローチを提供します.

研究 の 目的:

  • 高分子量ポリエチレンを合成するためのリドックス活性触媒の使用を調査する.
  • ポリエチレン微細構造の制御能力,特にリガンドベースのリドックス化学による分岐密度および同一性を実証する.

主な方法:

  • 酸化還元活性分子を有する触媒を用いたポリエチレン合成.
  • 化学的還元剤をポリマー化炉にインサイト添加する.
  • ゲル浸透クロマトグラフィー (GPC) と核磁共振 (NMR) スペクトロスコーピーを用いてポリエチレンの特徴化.

主要な成果:

  • 高分子量ポリエチレンの合成が成功しました
  • 局所縮小剤を添加することで,約30%の分岐密度を調節する能力が実証されている.
  • ポリマーの微細構造に影響を与えるリガンドベースのリドックス化学の証拠.

結論:

  • 酸化還元活性成分を持つ触媒は,強化されたポリメリゼーション制御のための強力なツールを提供します.
  • 還元剤による触媒酸化状態の局所調節は,ポリエチレン微細構造の正確な調整を可能にします.
  • このアプローチは特定の性質を持つポリマーを設計するための新しい経路を提供します.