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相关概念视频

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...
3.6K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.4K
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...
3.4K
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.4K
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...
2.4K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.7K
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...
2.7K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.3K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.3K
Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

2.7K
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...
2.7K

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相关实验视频

Updated: Sep 11, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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通过多元组件C─H激活/取消聚合物,轻松合成多元化含比索奎诺林聚合物.

Jiajun Liao1, Dongyang Fan1, Chao Yang1

  • 1Center for AIE Research, Guangdong Provincial Key Laboratory of New Energy Materials Service Safety, College of Materials Science and Engineering, Shenzhen University, Shenzhen, Guangdong, 518060, China.

Angewandte Chemie (International ed. in English)
|August 12, 2025
PubMed
概括

这项研究引入了一种新的单聚合法,用于制造多种含有双诺林的聚合物 (BCP). 这些先进的材料具有可调节的发光,可以用于生成高分辨率的光图案.

关键词:
聚合诱导的排放量 聚合诱导的排放量含有双诺林的聚合物基拉尔聚合物是一种基拉尔聚合物.C─H激活/取消的情况.新的聚合反应反应.

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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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

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相关实验视频

Last Updated: Sep 11, 2025

Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones
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Efficient Construction of Drug-like Bispirocyclic Scaffolds Via Organocatalytic Cycloadditions of α-Imino γ-Lactones and Alkylidene Pyrazolones

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Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

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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

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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:

  • 双二烯支架以其独特的光物理特性和轴性性而闻名,使其在各种科学领域具有价值.
  • 功能性双二醇含聚合物 (BCP) 的合成受到合成复杂性的显著阻碍,限制了它们的广泛应用.
  • 通过不对称的催化聚合物的光学活性BCP的开发仍然是一个未实现的目标.

研究的目的:

  • 开发一种高效和多功能的战略,用于合成结构多样化的含有双诺林的聚合物 (BCPs).
  • 通过不对称的催化聚合物实现光学活性BCP的构建.
  • 探索合成的BCP的特性和应用,包括它们的发光特性和光模式的潜力.

主要方法:

  • 采用了一种多组件级联C─H激活/取消聚合 (CAAP) 策略.
  • 随时可用的基衍生物,内部二烯酸和酸被用作起始材料.
  • 催化剂用于阿基拉和不对称的CAAP反应,在空气下进行一一步操作.

主要成果:

  • 合成了各种具有高分子量 (高达49900gmol-1) 的多替代BCP,产生了良好的产量.
  • 由此产生的BCP显示出出色的溶解性,良好的薄膜形成能力和可调节的发光特性.
  • 具有稳定的轴性形配置的光学活性BCP和BCP-金属复合体使用形催化剂成功生成.

结论:

  • 开发的CAAP策略提供了对各种BCP的轻松访问,克服了以前的合成限制.
  • 合成的BCP具有材料科学应用的理想特性,特别是用于创建高分辨率光光谱.
  • 这项工作是通过不对称的催化聚合物成功构建光学活性BCP的首次,为性材料开发开辟了新的途径.