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相关概念视频

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...
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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...
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Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
2.3K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.7K
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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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...
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Characteristics and Nomenclature of Copolymers01:24

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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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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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在可逆交联聚合物中使用 furan 保护的 4-Maleimidomethyl styrene.

Alfred Andreas Hamm1, Gregor Schnakenburg2, Sigurd Höger1

  • 1Kekulé-Institut für Organische Chemie und Biochemie, University of Bonn, Bonn, Germany.

Macromolecular rapid communications
|June 23, 2025
PubMed
概括

研究人员开发了新的方法来制造maleimide聚合物,用于可逆的Diels-Alder交叉链接. 这些聚合物提供可调节的马利米德含量和共聚合,使新的功能材料成为可能.

关键词:
迪尔斯-阿尔德反应马列伊米多甲基 styrene 的使用情况.这是一种自我愈合的疗法.这是不可逆转的交叉连接.

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科学领域:

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

背景情况:

  • 可逆交联聚合物正在获得先进材料应用的兴趣.
  • 含有马莱胺的聚合物是迪尔斯-阿尔德交联反应的关键组成部分.
  • 需要有效的合成路径来控制聚合物特性.

研究的目的:

  • 介绍两种新的合成策略,用于制备maleimide功能化的聚合物.
  • 为了研究一种新的maleimide单体的共聚合行为.
  • 为了证明Diels-Alder交叉连接的可逆性和进一步功能化的潜力.

主要方法:

  • 在聚合物层面上使用聚乙烯--4-甲基乙烯 (poly(styrene-stat-4-chloromethylstyrene) 进行化法.
  • 使用4-甲基烯在单体水平上对原保护的马利米德进行N-化.
  • 单体和聚合物性质的表征,包括共聚合行为和交联可逆性.

主要成果:

  • 为含有maleimide的聚合物建立了两个可行的合成途径.
  • 可自由调节的马莱胺含量和与各种共体的共聚化是可以实现的.
  • 新型单体表现出有前途的共聚合行为,交联反应显示出可逆性.

结论:

  • 开发的合成方法为制造maleimide聚合物提供了多功能方法.
  • 这些聚合物适用于可逆的Diels-Alder交叉连接,并且可以进一步功能化.
  • 这些发现有助于推进智能和适应性高分子材料的发展.