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関連する概念動画

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

1.8K
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...
1.8K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.3K
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...
2.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.4K
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...
1.4K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.5K
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.
8.5K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

1.7K
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...
1.7K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

3.0K
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...
3.0K

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Updated: May 6, 2026

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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フォトリトグラフィックオレフィンメタテシスポリメリゼーションのポリメリゼーション

Raymond A Weitekamp1, Harry A Atwater, Robert H Grubbs

  • 1Arnold and Mabel Beckman Laboratories for Chemical Synthesis, Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|November 1, 2013
PubMed
まとめ

科学者たちは,機能的な材料のパターニングのための新しいネガティブトーン・フォトレジスタを開発しました. このブレークスルーは,オレフィンメタテシスのための光活性化触媒を使用し,マイクロおよびナノ製造における材料の可能性を拡大します.

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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

Published on: April 22, 2016

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関連する実験動画

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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科学分野:

  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー
  • 化学工学は化学工学というものです.

背景:

  • フォトリトグラフィーは,マイクロおよびナノ構造の製造に不可欠ですが,光抵抗性化学によって制限されています.
  • 現在の方法では,パターンを描くことができる機能的な材料の種類を制限しています.
  • 新しい光抵抗剤の開発は,材料のパターニングを進めるために不可欠です.

研究 の 目的:

  • 先進的な材料のパターニングのための新しいネガティブトーン・フォトレジスタを導入する.
  • フォトリトグラフィにおける光活性化触媒を用いた新しいアプローチを実証する.
  • フォトパターニングに適した材料の範囲を広げること.

主な方法:

  • 商用素材からの新しいネガティブトーンフォトレジスタのワンポット合成.
  • 光活性化されたルテニウムビニルエーテル複合体の触媒を組み込む.
  • ルーテニウム媒介のオレフィンメタテシスを利用して材料のパターニング.

主要な成果:

  • 開発されたフォトレジスタは,高精度で機能的な材料のパターニングを可能にします.
  • このシステムは,光で活性化され,以前は不活性と考えられていたルテニウム触媒に基づいています.
  • ルーテニウム媒介オレフィンメタテシスの特徴である機能的グループ耐性を実証した.

結論:

  • このフォトレジスタは,マイクロおよびナノ構造物を製造するための新しい経路を提供します.
  • 光活性化された触媒は,光パターニング能力の範囲を拡大します.
  • 精密なパターンを持つ複雑な機能的材料を作成するための新しい道を開きます.