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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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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.2K
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
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.5K
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...
2.5K
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

3.7K
Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

3.1K
Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
3.1K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.3K
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.
9.3K

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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通过多态工程来操纵同一个有机分子的RTP特性.

Deliang Wang1,2, Hongzhuo Wu3, Songwang Lin1

  • 1Center for AIE Research, Shenzhen Key Laboratory of Polymer Science and Technology, Guangdong Research Center for Interfacial Engineering of Functional Materials, College of Materials Science and Engineering, Shenzhen University, Shenzhen 518061, China. xiongyu@szu.edu.cn.

Chemical communications (Cambridge, England)
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概括
此摘要是机器生成的。

研究人员设计了Cbz-COOH的五种晶体形式,发现了独特的室温光 (RTP) 特性. 这项工作为通过多态控制设计有机RTP材料提供了一种新策略.

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科学领域:

  • 固态化学 固态化学
  • 材料科学是一种材料科学.
  • 有机电子学有机电子学

背景情况:

  • 有机室温光 (RTP) 材料对于照明和传感等应用至关重要.
  • 控制固态中的分子包装是调整光物理性质的关键.
  • 多态性,一种化合物结晶成多种形式的能力,为实现这种控制提供了一条途径.

研究的目的:

  • 为了研究多态性对Cbz-COOH.室温光 (RTP) 特性的影响.
  • 建立基于多态工程的有机RTP材料的合理设计原则.
  • 探索晶体结构和光特性之间的关系.

主要方法:

  • 单晶X射线衍射用于多态物的结构特征.
  • 光发光谱学用于测量辐射光谱,寿命和量子产量.
  • 合成和分离Cbz-COOH的五种不同的单晶多态.

主要成果:

  • 成功获得并描述了Cbz-COOH.的五个单晶多态.
  • 对每个多态体观察到不同的室温光 (RTP) 特性,包括辐射波长,光寿命和量子产量的变化.
  • 证明了一个结构-属性关系,其中晶体包装显著影响RTP行为.

结论:

  • 多态工程是一种可行的策略,用于调整有机材料的RTP特性.
  • Cbz-COOH系统作为理解和设计新的有机RTP发射器的模型.
  • 这项研究为开发具有定制光特性的先进有机材料提供了基础.