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相关概念视频

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: Acyclic Diene Metathesis (ADMET)00:53

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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...
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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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Polymer Classification: Architecture01:14

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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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Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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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.
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Designed for Molecular Recycling: A Lignin-Derived Semi-aromatic Biobased Polymer
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可降解的π合聚合物

Azalea Uva1, Sofia Michailovich1, Nathan Sung Yuan Hsu1

  • 1Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada.

Journal of the American Chemical Society
|April 24, 2024
PubMed
概括
此摘要是机器生成的。

发展可降解电子需要新的导电和半导体材料. 这种观点侧重于π合聚合物,为先进的环保电子应用提供设计策略.

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科学领域:

  • 材料科学
  • 有机电子
  • 聚合物化学

背景情况:

  • 下一代电子产品提供了先进的功能,
  • 可降解的电子设备可以减轻环境影响,并使新的监控应用成为可能.
  • 在可降解的导电和半导体材料,特别是 π 合聚合物中存在当前的限制.

研究的目的:

  • 概述用于有机电子产品的高性能可降解π合聚合物的关键设计考虑因素.
  • 解决单体选择,合成和降解途径的挑战.
  • 为了加速下一代可降解电子材料的发现.

主要方法:

  • 专注于三个关键设计参数: π 结合的单体选择,合成合策略和聚合物降解.
  • 生物基单体和可化学回收的稳定单体的探索.
  • 讨论聚合技术,如直接合和酶聚合.
  • 脱聚合方式的分析和降解副产品的表征.

主要成果:

  • 确定了选择π合单体的策略,包括生物基选择和可回收的稳定单体.
  • 提出了相容的聚合方法,如直接合和酶聚合.
  • 强调了解材料设计的降解途径和副产品的重要性.

结论:

  • 对单体设计,合成和降解的平行考虑对于推进可降解的π合聚合物至关重要.
  • 针对性应用指导下一代可降解电子产品的高性能材料的开发.
  • 这种观点为发现可持续电子设备的新型π合聚合物提供了框架.