Jove
Visualize
お問い合わせ
JoVE
x logofacebook logolinkedin logoyoutube logo
JoVEについて
概要リーダーシップブログJoVEヘルプセンター
著者向け
出版プロセス編集委員会範囲と方針査読よくある質問投稿
図書館員向け
推薦の声購読アクセスリソース図書館諮問委員会よくある質問
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experimentsアーカイブ
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教員リソースセンター教員サイト
利用規約
プライバシーポリシー
ポリシー

関連する概念動画

Colloids03:22

Colloids

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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.
π Molecular Orbitals of 1,3-Butadiene01:24

π Molecular Orbitals of 1,3-Butadiene

Conjugated dienes have lower heats of hydrogenation than cumulated and isolated dienes, making them more stable. The enhanced stabilization of conjugated systems can be understood from their π molecular orbitals.
The simplest conjugated diene is 1,3-butadiene: a four-carbon system where each carbon is sp2-hybridized and has an unhybridized p orbital that contains an unpaired electron. According to molecular orbital theory, atomic orbitals combine to form molecular orbitals such that the number...
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

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

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

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

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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...

こちらも読む

関連記事

共著者、ジャーナル、引用グラフによってこの研究に関連する記事。

並び替え
Same author

On the Metal Indium and Recent Discoveries on Spectrum Analysis.

Edinburgh medical journal·2018
Same author

Evaluation of the Antimicrobial Activity of Sparfloxacin, Relative to Other Oral Antibiotics Against 1,125 Bacterial Isolates from 10 Medical Centers in Brazil.

The Brazilian journal of infectious diseases : an official publication of the Brazilian Society of Infectious Diseases·2000
Same author

A simple method for controlling dendritic architecture and diversity: A parallel monomer combination approach

The Journal of organic chemistry·2000
Same author

Identification and characterization of the trnS/pseudo-tRNA/nad3/rps12 gene cluster from Coix lacryma-jobi L: organization, transcription and RNA editing.

Plant science : an international journal of experimental plant biology·2000
Same author

Surface-Confined Light Harvesting, Energy Transfer, and Amplification of Fluorescence Emission in Chromophore-Labeled Self-Assembled Monolayers This research was supported by the office of Naval Research, the AFOSR-MURI program, as well as fellowships from the Netherlands Scientific Organization (NWO), and from the Eastman Kodak Company, which are gratefully acknowledged.

Angewandte Chemie (International ed. in English)·2000
Same author

Intercalation compounds involving inorganic layered structures

Anais da Academia Brasileira de Ciencias·2000

関連する実験動画

Updated: Jul 22, 2026

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
09:02

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

相互作用しないポリチレンで支えられているメタロセンのポリオレフィン球体.

Roscoe1, Frechet, Walzer

  • 1S. B. Roscoe and J. M. J. Frechet, Department of Chemistry, University of California, Berkeley, CA 94720, USA. J. F. Walzer and A. J. Dias, Baytown Polymer Center, Exxon Chemical Company, 5200 Bayway Drive, Baytown, TX 77520, USA.

Science (New York, N.Y.)
|April 29, 1998
PubMed
まとめ

新しいポリシュチレンサポーターは,オレフィンポリメリゼーションにおける触媒の無効化を防止し,ポリマービーズ内の均質な触媒部位を可能にします. この方法は,制御可能なサイズを持つ均一なポリオレフィンビーズを生成します.

科学分野:

  • ポリマー化学のポリマー化学について
  • カタリシス カタリシス カタリシス
  • マテリアルサイエンス 材料科学

背景:

  • メタロセンの触媒は,オレフィンポリメリゼーションに高い活性を示しますが,従来のシリカ基板によって無効化する傾向があります.
  • サポートされた触媒は,均質なシステムよりも取り扱いの利点を提供しますが,サポートの相互作用は有害である可能性があります.

研究 の 目的:

  • 破壊的な相互作用を防ぐために,メタルロセネ触媒の非相互作用サポートを開発する.
  • オレフィンポリメリゼーションにおける安定性と性能を向上させながら,サポートされた触媒の利点を維持する.

主な方法:

  • 相互作用しない,軽くクロスリンクされた,クロロメチル化されたポリシュタイレンの基板が合成されました.
  • サポートされたメタルロセンの触媒は,ポリシュチレンビーズを特定の反応剤で連続的に処理することによって準備されました.
  • 触媒部位は,ポリシュチレンビーズ内に均一に分布していた.

主要な成果:

  • 開発されたポリスティレンのサポートは,メタルロセンの触媒との破壊的な相互作用を効果的に回避します.
  • ポリメリゼーションはサポートビーズの中で発生し,均質な触媒部位につながります.
  • エチレンと1-ヘクセンの共ポリメリゼーションにより,離散的で球形のポリオレフィンビーズ (0.3-1.4mm) が生成されました.

さらに関連する動画

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
07:01

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Published on: January 25, 2018

関連する実験動画

Last Updated: Jul 22, 2026

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
09:02

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
10:53

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils
07:01

Preparation of Hollow Polystyrene Particles and Microcapsules by Radical Polymerization of Janus Droplets Consisting of Hydrocarbon and Fluorocarbon Oils

Published on: January 25, 2018

  • ポリオレフィンビーズの大きさは,ポリメリゼーション時間を調整することによって制御することができました.

    • 結論:

    • メタルロセーンで触媒化されたオレフィンポリメリゼーションには,新しいポリシュチレンサポートシステムが有効です.
    • このアプローチは,シリカ基のサポートの限界を克服し,触媒の安定性を向上させます.
    • この方法により,調節可能なサイズで均一なポリオレフィンビーズを生産することができます.