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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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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Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

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Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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...
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Site-Targeted Drug Delivery Systems: Polymeric Carriers01:24

Site-Targeted Drug Delivery Systems: Polymeric Carriers

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Polymeric carriers enhance targeted drug delivery by increasing efficacy while minimizing off-target effects. These carriers comprise a biodegradable polymeric backbone integrated with functional elements that enable targeting, improve physicochemical properties, and regulate drug release.Targeting MechanismsThe targeting ability of polymeric carriers is mediated by a homing device, which is a molecular recognition component designed to selectively bind to specific tissues or cells. Monoclonal...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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シアビサイクロナンの抗菌ポリケーション

Zhishuai Geng1, M G Finn1

  • 1School of Chemistry & Biochemistry, Georgia Institute of Technology , 901 Atlantic Drive, Atlanta, Georgia 30332, United States.

Journal of the American Chemical Society
|October 21, 2017
PubMed
まとめ
この要約は機械生成です。

新しいビサイクロ[3.3.1]ノンアン (BCN) ポリケーションは,低濃度であっても,細菌に対する強力な抗菌作用を示す. これらの新しいポリマーは,機能化された表面でも有効性を示し,細菌の増殖と闘うための多用途を提供します.

さらに関連する動画

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科学分野:

  • ポリマー化学
  • 材料科学
  • 抗菌剤

背景:

  • Bicyclo[3.3.1]nonane (BCN) 構造はユニークな分子構造を提供します.
  • ポリカチオンは抗菌作用があることが知られている.
  • 高効能で選択性の高い新しい抗菌剤の開発は極めて重要です.

研究 の 目的:

  • 新しいビサイクロ[3.3.1]ノンアン (BCN) ベースのポリケーションを合成する.
  • これらの新しいポリイオンの抗菌活性と選択性を評価する.
  • バクテリアの制御のために機能化された表面にBCNポリケーションの適用を調査する.

主な方法:

  • チアビサイクロ[3.3.1]ノンアンの二酸化窒素とピリジンの核性分子との反応によるBCNポリケーションの合成.
  • 機能化および長さ変数のリンクを可能にするモジュール合成.
  • 銅触媒によるアジドアルキンサイクル添加を用いたポリメリゼーション後の改変.
  • 細菌の増殖と静的細胞に対する抗菌効果試験
  • 選択性評価のための赤血球溶解試験
  • BCNポリケーションによる固体基板 (ガラス,シリコン) の機能化

主要な成果:

  • 中程度の鎖長を持つ新しいBCNポリケーションを合成しました.
  • ポリマーはバクテリアの増殖 (μg/mL) と静的細胞の破壊 (ng/mL) を有意に示した.
  • 赤血球溶解に対する適度から良好な選択性を達成した.
  • 開発されたポリマーはバクテリアの抵抗性の発達を遅らせた.
  • 降解可能なBCNポリケーションは,他の抗菌剤に対するE. coliの感受性を高めました.
  • 機能化された表面は 繰り返しバクテリアを殺す能力を発揮しました

結論:

  • BCNポリケーションは 有望な新種のポリヨネン抗菌剤です
  • これらのポリマーには強力で選択的な抗菌作用があります.
  • 表面固定されたBCNポリケーションは,様々な基板での細菌制御のための耐久的な解決策を提供します.