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相关概念视频

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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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: 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
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,...
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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...
2.7K
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

3.6K
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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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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通过可切换的PIESA进行序列控制的中性离子多块类共聚物

Fabian H Sobotta1, Bas G P van Ravensteijn2, Ilja K Voets1

  • 1Laboratory of Self-Organizing Soft Matter, Department of Chemical Engineering and Chemistry and Institute for Complex Molecular Systems, Eindhoven University of Technology, P.O. Box 513, 5600 MB, Eindhoven, The Netherlands.

ACS macro letters
|August 22, 2025
PubMed
概括

这项研究引入了聚合诱导的静电自组合 (PIESA),以精确控制中性离子共聚物组成和序列. 这种单一的方法简化了复杂的聚合物结构的创建,克服了以前的局限性.

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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科学领域:

  • 聚合物化学
  • 材料科学
  • 超分子化学

背景情况:

  • 合成具有可控组成和序列的共聚物,特别是具有离子组的共聚物,是聚合物科学的重大挑战.
  • 制造复杂的聚合物结构的现有方法通常是劳动密集型和耗时的.
  • 以往使用聚合诱导的静电自组合 (PIESA) 的研究主要集中在同子纳米结构上.

研究的目的:

  • 开发一种直接的,单一的方法来控制中性离子共聚物的组成和序列.
  • 使用PIESA从中性和离子单体的等分质混合物中创建复杂的聚合物链拓.
  • 展示一种用于调节单体反应性的新方法,并实现聚合物结构的按需编程.

主要方法:

  • 在水溶液中利用聚合诱导的静电自组合 (PIESA).
  • 采用相反电荷的模板来选择性地招募充电单体而不是中性单体,从而创建分离的反应环境.
  • 通过循环调整模板的电荷密度 (酸性/性) 来切换模板的"开启"和"关闭"进行调节的单体合并.

主要成果:

  • 在单工艺中精确控制共聚物组成和序列.
  • 展示了创建复杂链路拓的能力,包括交替的多块结构.
  • 通过微调pH切换周期展示特定块序列和组合的按需编程.

结论:

  • 可以有效地利用PIESA来控制中性离子共聚物组成,序列和拓.
  • 超分子分离的选择性和可逆性为调节单体反应提供了强大的策略.
  • 这种方法为合成复杂的聚合物架构提供了简单有效的方法.