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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.2K
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,...
2.2K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.8K
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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

8.5K
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.
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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.3K
Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...
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関連する実験動画

Updated: Oct 13, 2025

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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電子化学的に制御されたリング開封ポリマーによるABCとABABブロック共ポリマー

Zachary C Hern1, Stephanie M Quan1, Ruxi Dai1

  • 1Department of Chemistry and Biochemistry, University of California, Los Angeles, Los Angeles, California 90095-1569, United States.

Journal of the American Chemical Society
|November 18, 2021
PubMed
まとめ
この要約は機械生成です。

研究者たちは,多ブロック共ポリマーを合成するための電気化学的に制御された方法を開発しました. このテクニックは,モノメアの選択を制御するために触媒の酸化還元状態の変化を使用して,1つの鍋で複雑なポリマー構造の作成を可能にします.

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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科学分野:

  • ポリマー化学
  • 有機金属化学
  • 電気化学

背景:

  • マルチブロックコポリマーは独特の材料特性を有しますが,合成は複雑です.
  • 制御されたポリメリゼーション技術は,高度なポリマーアーキテクチャの設計に不可欠です.
  • 触媒のリドックス状態操作は,ポリマー合成を制御するための新しいアプローチを提示します.

研究 の 目的:

  • マルチブロックコポリマーの電気化学的に制御された合成を報告する.
  • 選択的なモノメア組み込みのための催化剤の代替リドックス状態の使用を実証する.
  • 複数のコポリマー構造を"ポット"方式で作る.

主な方法:

  • ガラスのような炭素の作業電極を用いた電気化学合成.
  • 触媒の酸化状態を変えるためのインシットポテンシャルスイッチ
  • モノマー (l-ラクチド,β-ブチロラクトン,サイクロヘクセン酸化物) の連続添加

主要な成果:

  • ABABテトラブロックとABCトライブロック構造を含む様々なマルチブロック共ポリマーを成功裏に合成した.
  • 触媒の酸化還元状態を調節することによって,モノマー選択性を制御する.
  • 中等に狭い分散度 (1.1〜1.5) と7〜26 kDaの分子量を持つポリマーを生産した.

結論:

  • 電気化学制御は,マルチブロックコポリマーを合成するための実行可能で汎用的な方法を提供します.
  • この技術により,ポリマーの構造と組成を正確に制御できます.
  • この方法は,従来の化学的リドックス反応剤のアプローチに匹敵する.