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相关概念视频

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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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 Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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: Overview01:13

Olefin Metathesis Polymerization: Overview

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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 of a...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

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Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.2K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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...
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Updated: Jan 13, 2026

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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聚氨基的氨基酸平台:可控环开放聚合,完全可回收,可调性聚合/可脱聚合.

Shi Ou1, Yu Dai1, Zhaolin Ding1

  • 1College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, Jiangsu, 211816, P. R. China.

Angewandte Chemie (International ed. in English)
|January 12, 2026
PubMed
概括

研究人员开发了一个多功能平台,通过阿巴拉克单体从氨基酸中合成多种多氨基 (PAE). 这种方法使可调节的聚合物特性和高效的脱聚合成为可能,为聚合物设计提供了洞察力.

关键词:
亚萨拉克顿是一种阿萨拉克顿.聚氨基) 是一种聚氨基.可聚合性/可脱聚合性环开放聚合的聚合方式结构与活动之间的关系.

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科学领域:

  • 聚合物化学 聚合物化学
  • 有机合成 有机合成
  • 材料科学 材料科学 材料科学

背景情况:

  • 聚氨基 (PAE) 提供生物降解性和可调性功能,但缺乏多功能合成平台.
  • 开发有效的方法来创建多样化的PAE库对于扩展其应用至关重要.

研究的目的:

  • 建立一个易于使用和多功能平台,用于从氨基酸合成各种PAE.
  • 为了研究结构-活性关系,控制环开放聚合 (ROP) 和阿巴拉克单体的脱聚合.

主要方法:

  • 从可再生的氨基酸和环氧化物中合成阿巴拉克单体,采用两步过程.
  • 使用有机催化控制的ROP来聚合阿萨拉克单体.
  • 进行了脱聚合研究以评估单体回收和动力学.
  • 研究了单体结构 (N-替代物,核心替代物,立体配置,环大小) 对聚合和脱聚合的影响.

主要成果:

  • 成功合成了一系列具有量身定制性质的阿萨拉克单体.
  • 实现了阿萨拉克单体的受控ROP,产生各种PAE.
  • 证明了PAE的定量去聚合,使其变成具有第一阶动态的原始单体.
  • 建立了脱聚合和聚合速率常数之间的反相关性.
  • 通过调整 azalactone 结构和天花板温度 (-20 ~ 37 °C) 来调节聚合性和脱聚合性的能力.

结论:

  • 开发的平台提供了一条通往来自氨基酸的多种PAE的多功能途径.
  • 单体结构显著影响ROP的反应性,聚合性和脱聚合性.
  • 可调节的天花板温度可以控制聚合和脱聚合,从而实现可回收的聚合物系统.