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関連する概念動画

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.0K
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.7K
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.
7.7K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.4K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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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...
2.2K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.4K
Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
3.4K
Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

2.8K
Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
2.8K

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Updated: May 27, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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商用ポリメタクリレットの可視光誘発デポリメリゼーション

Hyun Suk Wang1, Mikhail Agrachev2, Hongsik Kim3

  • 1Laboratory of Polymeric Materials, Department of Materials, ETH Zurich, Vladimir-Prelog-Weg 5, Zurich, Switzerland.

Science (New York, N.Y.)
|February 20, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,可視光を用いたポリメタクリレートなどの一般的なプラスチックを脱ポリマー化するための新しい方法が紹介されています. この突破は プラスチック廃棄物の 拡張可能で効率的なリサイクルソリューションを提供します

さらに関連する動画

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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関連する実験動画

Last Updated: May 27, 2025

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

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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

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning

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科学分野:

  • ポリマー化学
  • 持続可能な材料科学
  • 緑の化学

背景:

  • プラスチック廃棄物は 深刻な環境問題です
  • 現在のデポリメリゼーション方法は,商用用途には適さない特殊なポリマーを必要とします.
  • カーボン・カーボン・バックボーンを持つビニールポリマーの効率的なリサイクルは依然として困難です.

研究 の 目的:

  • 商業用ポリマーに適用できる脱ポリマー化方法を開発する.
  • ポリメタクリレットの可視光誘発リサイクルを可能にします.
  • 既存のプラスチックリサイクル技術の限界を解決する

主な方法:

  • メインチェーンが誘発した可視光による脱ポリメリゼーション
  • 溶媒から塩素ラジカルを生成する.
  • 商用ポリメタクリレートへの適用

主要な成果:

  • ポリメタクリラートでは,ほぼ定量的な脱ポリマー化 (> 98%) が達成された.
  • ポリマー合成経路,エンドグループ,または分子量 (最大160万ダルトン) にかかわらず有効である.
  • マルチグラムスケールのデポリメリゼーションが成功しました.

結論:

  • 可視光誘発デポリメリゼーションは,商業用ポリマーのリサイクルに多用途で一般的な経路を提供します.
  • この方法は,安定したポリマー背骨の脱ポリマー化に関連する課題を克服します.
  • このアプローチはプラスチック廃棄物管理の 実践的な解決策です