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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.7K
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,...
2.7K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.9K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.9K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

4.0K
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...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

2.6K
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 polymer...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.6K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.6K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.5K
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...
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Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
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ボロン"ドーピング"ポリエチレン

Keda Hu1, Zhen Zhang1, James Burke1

  • 1Department of Chemistry & Chemical Biology, University of New Mexico , MSC03 2060, 1 UNM, Albuquerque, New Mexico 87131, United States.

Journal of the American Chemical Society
|July 27, 2017
PubMed
まとめ
この要約は機械生成です。

研究者らは,芳香的背骨のない新しいボロンを含む結合ポリマー (CPs) を合成した. これらのボロン添加ポリアセチレン (BPA) は,高度な電子デロカライゼーションを示し,先進的な材料のための新しい道を開きます.

さらに関連する動画

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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Last Updated: Feb 25, 2026

Methionine Functionalized Biocompatible Block Copolymers for Targeted Plasmid DNA Delivery
08:09

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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科学分野:

  • 材料科学
  • ポリマー化学
  • オーガニック電子

背景:

  • 結合ポリマー (CP) は有機電子機器にとって極めて重要です.
  • ポリマーの骨格にボールを組み込むことは,電子特性を調整するための新興戦略です.
  • 既存のボロン含有型CPは,しばしば芳香成分に依存し,骨幹の移転を制限する.

研究 の 目的:

  • 主鎖のボロンを含む結合ポリマー (CPs) の新種を合成し,特徴づけること.
  • ボロン添加ポリエチレン (BPA) は,骨幹に芳香成分が欠けているメインチェーンのボロンを含むCPの最初の例として調査する.
  • この新しいポリマーの物理的および電子的性質に交互結合のサイドチェーンがどのように影響するかを理解する.

主な方法:

  • 核磁共振 (NMR) スペクトロスコーピー
  • 吸収と放射スペクトロシー
  • サイクルボルトメトリ
  • 理論的な計算
  • フッ化物定位実験

主要な成果:

  • 新しい主鎖のボロン含有結合ポリマー (CPs) の合成と特徴づけに成功した.
  • ボロン添加ポリエチレン (BPA) が最初の非芳香性主鎖のボロン含有CPsであることを実証する.
  • アロマティックユニットがないため,ポリマーのメインチェーンに沿って電子デロカライゼーションの強化の証拠.
  • 交互結合のサイドチェーンがポリマーの性質に与える影響を詳細に理解する.

結論:

  • 開発されたボロン添加ポリエチレン (BPA) は,ボロンを含む主鎖結合ポリマーにおける重要な進歩を表しています.
  • ポリマーの骨格に芳香成分がないことにより,電子デロカライゼーションが強化され,電子性能が向上する可能性があります.
  • この研究は,高度な用途に合わせた性質を持つ新しいボロンを含むポリマーの設計のための基礎を提供します.