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関連する概念動画

Polymers02:34

Polymers

35.7K
The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the...
35.7K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

2.7K
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...
2.7K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.8K
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.
7.8K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
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...
2.1K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.5K
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...
3.5K
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.2K
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

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Updated: Jun 28, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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プログラムされた脱ポリマー化のためにシロキサン結合で結合された植物油のポリマー

Chen Cheng1, Jake X Shi1,2, Eun-Hye Kang1

  • 1Department of Chemistry, University of California, Berkeley, Berkeley, California 94720, United States.

Journal of the American Chemical Society
|April 23, 2024
PubMed
まとめ
この要約は機械生成です。

この研究では,制御されたデポリメリゼーションと再ポリメリゼーションのためのシロキサン結合を組み込んだ新しいバイオベースのポリマーを導入し,プラスチック廃棄物の削減と持続可能な材料開発への循環経済アプローチを提供します.

さらに関連する動画

Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

Published on: November 30, 2020

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
14:37

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles

Published on: July 6, 2012

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関連する実験動画

Last Updated: Jun 28, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
08:12

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer

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High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles
14:37

High-throughput Synthesis of Carbohydrates and Functionalization of Polyanhydride Nanoparticles

Published on: July 6, 2012

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科学分野:

  • ポリマー化学
  • 材料科学
  • 緑の化学

背景:

  • プラスチック廃棄物の増加と化石燃料への依存は 持続可能な代替手段を必要としています
  • 再生可能資源からのポリマーの開発は環境保護にとって極めて重要です.
  • 制御されたデポリメリゼーションと再ポリメリゼーションは,ポリマーの循環性を達成するための鍵です.

研究 の 目的:

  • シロキサン結合を用いて再生可能な原料から新しいポリマーを合成する.
  • これらのポリマーの制御されたデポリメリゼーションと再ポリメリゼーションを調査する.
  • 開発されたポリマーの環境分解と微生物の代謝を評価する.

主な方法:

  • シロキサンを含むα,ω-ダイースターとα,ω-ダイオルの合成
  • バイオベースのモノマーとマクロラクトンのリング開きポリメリゼーション
  • プロティック溶剤または酸触媒でプログラムされた脱ポリメリゼーション
  • 酵素分解試験とCラベルのモノマー代謝試験

主要な成果:

  • シロキサンを含むモノマーとコポリマーを 合成してポリマー化しました
  • モノマーに制御されたデポリメリゼーションを達成し,再ポリメリゼーションを可能にし,循環性を実証した.
  • キノコのクチナゼによる酵素性水解と,ポリマー成分の微生物の微分代謝が実証されている.

結論:

  • 開発されたシロキサン含有ポリマーは 持続可能な循環型プラスチックへの 有望な経路を提供します
  • これらの材料は プラスチック廃棄物の蓄積を防ぐ 制御された分解経路を示しています
  • この研究は,循環型経済のためのバイオベースの原料と革新的なポリマーの設計の可能性を強調しています.