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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
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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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.1K
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...
2.1K
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

2.5K
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...
2.5K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.1K
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,...
2.1K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.4K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Polymers02:34

Polymers

36.4K
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...
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Updated: Aug 29, 2025

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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非生命体ポリメリゼーションにおけるカチオンスイッチングダイナミクスの制御によるポリマーのカスタマイズ

Thi V Tran1, Eryn Lee1, Yennie H Nguyen1

  • 1Department of Chemistry, University of Houston, 4800 Calhoun Road, Houston, Texas 77004, United States.

Journal of the American Chemical Society
|September 7, 2022
PubMed
まとめ

研究者は,金属触媒と二次金属カチオンを使用して,非生物のポリメリゼーションを制御するための新しい戦略を開発しました. この方法は,ポリマー鎖の成長を正確に制御し,エチレンポリメリゼーションにおける急速な鎖終結の限界を克服します.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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科学分野:

  • ポリマー化学
  • 有機金属化学

背景:

  • 非生物のポリメリゼーションの制御は,鎖の迅速な終結のために困難です.
  • 既存の方法は,終了前に外部トリガーを適用するために苦労します.

研究 の 目的:

  • 非生物のポリメリゼーションを制御するための新しい戦略を開発する.
  • ポリメリゼーション制御のために金属触媒と二次金属カチオン間の化学的バランスを利用する.

主な方法:

  • 2つのニッケルフェノキシフォスフィン-ポリエチレングリコール変種 (Ni1とNi2) を異なるフォスフィン置換剤で合成する.
  • 様々なアルカリ塩 (Li+,Na+,Cs+) の存在下でこれらの複合体を用いたエチレンポリメリゼーション研究.
  • ポリメリゼーションモード (非スイッチング対ダイナミックスイッチング) の溶媒の極性効果 (トルーエン/ダイエチルエーテル混合物) の調査.
  • メカニズムを明らかにするために,NMRスペクトロスコーピーを用いて反応製品の分析.

主要な成果:

  • 鎖の成長は電子効果に敏感であり,終結はステリックと電子の両方の要因に依存する.
  • 溶媒の極性を調整することで,非スイッチングまたはダイナミックスイッチングポリメリゼーションモードを制御できます.
  • ビモダルポリエチレンはNi1/Li+/Na+で生産され,その分子はカチオン比に依存している.
  • モノモダルポリエチレンで分子量と低分散度 (<2. 0) がNi2/Cs+で達成されました.

結論:

  • 開発された戦略は,金属触媒 - 離子バランスを利用して,非生命体ポリメリゼーションを効果的に調節します.
  • 急速なカチオン交換によって促進されるダイナミックなスイッチングメカニズムは,実験的証拠によって支持されています.
  • このアプローチは分子量や分散性などのポリマーの特性を正確に制御します