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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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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Polymers02:34

Polymers

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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

4.3K
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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ATP and Macromolecule Synthesis01:28

ATP and Macromolecule Synthesis

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Biological macromolecules are organic compounds, predominantly composed of carbon atoms. The carbon atoms are covalently bonded with hydrogen, oxygen, nitrogen, and other minor elements. There are four major biological macromolecule classes: carbohydrates, lipids, proteins, and nucleic acids.
Most macromolecules are composed of single subunits, or building blocks, called monomers. The monomers combine with each other using covalent bonds to form larger molecules known as polymers.
Conversion of...
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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.9K
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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関連する実験動画

Updated: Jan 15, 2026

Synthesis of Programmable Main-chain Liquid-crystalline Elastomers Using a Two-stage Thiol-acrylate Reaction
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リポ酸ホモポリマーの制御された合成 リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー・ポリメリゼーション

Kenny Lee1,2,3, Shiwei Han1,2, Parker T Morris3

  • 1Cluster for Advanced Macromolecular Design (CAMD), UNSW Australia, Sydney, New South Wales 2052, Australia.

Journal of the American Chemical Society
|October 6, 2025
PubMed
まとめ

リバーシブル・アディション・フラグメンテーション・チェーン・トランスファー (RAFT) ポリメリゼーションは,ポリポエート (PLp) の制御された合成を可能にし,バックビティングやデポリメリゼーションなどの課題を克服します. この方法により,安定した,再利用可能なPLp材料が得られます.

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科学分野:

  • ポリマー化学
  • 材料科学
  • 持続可能なポリマー

背景:

  • α-リポ酸から派生したポリポアート (PLp) は,バイオコンパティブルでリサイクル可能な材料として有望である.
  • 伝統的な急性ポリメリゼーションは,低い天井温度による反発と自発的な脱ポリメリゼーションの課題に直面しています.

研究 の 目的:

  • 制御されたPLpホモポリマーを合成するために,逆戻り添加断片鎖移転 (RAFT) ポリメリゼーションの有効性を実証する.
  • PLpの合成と安定を阻害する主要な課題に取り組む.

主な方法:

  • PLpホモポリマーを合成するためにRAFTポリメリゼーションを使用した.
  • ポリメリゼーション運動と分子量制御を調査した.
  • ポリマーの安定性と光誘発による脱ポリマー化が評価された.

主要な成果:

  • モノメア変換と第一順位の動力学による線形分子量増加を達成し,高い制御を示しています.
  • 精密に制御されたPLpの分子量は3.6から62.6kgmol−1である.
  • RAFTで合成されたポリマーは,トリチオカルボネート末端群による安定性 (> 2週間) と光誘発による脱ポリマー化を示した.

結論:

  • RAFTポリメリゼーションは,PLpの合成と安定性の課題を克服するための強力な戦略です.
  • 分子重量を正確に制御し,安定した,リサイクル可能な,分解可能なPLp材料を提供しました.
  • RAFTを使用して分解可能なブロックコポリマーを合成する可能性を証明した.