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関連する概念動画

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
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
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.3K
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...
2.3K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

2.2K
Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
2.2K
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

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関連する実験動画

Updated: Jun 26, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

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ポリメリゼーション/脱ポリメリゼーション誘発セルフアセンブリ ポリメリゼーションとセルフアセンブリのカップリングされた均衡下

Jiyun Nam1, Changsu Yoo1, Myungeun Seo1,2

  • 1Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea.

Journal of the American Chemical Society
|May 8, 2024
PubMed
まとめ
この要約は機械生成です。

リバーシブルポリメリゼーションとデポリメリゼーションによるポリマー鎖のダイナミック制御により,ブロックコポリマーが温度によって自己組み立てられ,調節可能な柔らかい材料になります.

さらに関連する動画

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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関連する実験動画

Last Updated: Jun 26, 2025

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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科学分野:

  • ポリマー化学
  • 材料科学
  • 超分子化学

背景:

  • ポリマー分解は ポリマーをモノマーに分解する 持続可能な経路を提供します
  • リバーシブルなポリメリゼーションとデポリメリゼーションは温度によって制御できます.
  • ブロックコポリマーの自己組み立ては ナノ構造を作るのに不可欠です

研究 の 目的:

  • リバーシブルポリメリゼーション/デポリメリゼーションを使用してブロックコポリマー自己組み立てのダイナミック制御を実証する.
  • ナノオブジェクトの温度誘発の可逆形質的移行を調査する.
  • 柔軟な材料としてこれらのダイナミック・システムの可能性を 探求する.

主な方法:

  • ポリエチレン酸化物から開始された δ-バレロラクトンのリング開きポリメリゼーションを使用した.
  • ポリメリゼーション/デポリメリゼーション/再ポリメリゼーションを誘導する温度サイクルを使用します.
  • 選択的溶媒におけるブロックコポリマーミセラーナノオブジェクトの形態学的移行を研究した.

主要な成果:

  • 温度変動によるブロックコポリマーの自己組み立てに対する可逆制御を達成した.
  • 包装パラメータを調節することによって,反転可能な形態学的移行 (例えば,棒-球-棒,繊維-棒-繊維) を実証した.
  • 溶媒の選択性は,エントロピー作用により低温での脱ポリメリゼーションを高めることが観察されました.

結論:

  • ポリメリゼーション/脱ポリメリゼーション誘発セルフアセンブリ (PDISA) は,ダイナミックなナノオブジェクト形成のための新しい方法を提供します.
  • ブロックコポリマーミセルの温度に反応する形態的変化が成功しました.
  • これらのダイナミックな柔らかい材料は,粘度などの調整可能なマクロスコーピカル特性を要求するアプリケーションの可能性を秘めています.