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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
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Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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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Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

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The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
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Updated: Jul 1, 2025

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
07:02

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

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在P ((VDF-co-TrFE) 铁电共聚合物上引入光交叉可连接的功能.

Konstantinos Kallitsis1,2, Alberto Alvarez-Fernandez3, Eric Cloutet2

  • 1Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge, CB3 1AS, United Kingdom.

ChemPlusChem
|March 12, 2024
PubMed
概括
此摘要是机器生成的。

研究人员开发了一种用于铁电聚合物的新化学修饰方法,使其在有机电子和微型制造中具有多功能应用. 这种技术可以轻松地接种功能组,增强先进设备的材料特性.

关键词:
交叉链接 - 交叉链接铁路电力公司化聚合物的化聚合物.接种 接种 接种摄影石刻法 (photolithography) 是一种光刻法.

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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相关实验视频

Last Updated: Jul 1, 2025

The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry
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The Preparation and Properties of Thermo-reversibly Cross-linked Rubber Via Diels-Alder Chemistry

Published on: August 25, 2016

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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科学领域:

  • 材料科学 材料科学 材料科学
  • 聚合物化学 聚合物化学
  • 有机电子 有机电子

背景情况:

  • 铁电聚合物是有机电子产品的关键,由于诸如指纹传感器等应用,人们对其越来越感兴趣.
  • 目前的优化依赖于物理方法,但化学修饰提供了新的潜力.
  • 铁电聚合物的聚合后修饰是一个新兴的领域.

研究的目的:

  • 开发一种简单的,基于溶液的方法,用于聚合后化学修饰铁电聚合物.
  • 为了证明功能组在聚乙烯化物-co-trifluoroethylene (P(VDF-co-TrFE)) 上的接种.
  • 探索改性聚合物的集成到微型制造工艺中.

主要方法:

  • 开发了一种基于溶液的化学接种技术,用于P(VDF-co-TrFE).
  • 将光敏感组移植到聚合物骨干上.
  • 利用修改过的聚合物作为负光电阻在光电法.

主要成果:

  • 成功地将功能组移植到商业上可用的P(VDF-co-TrFE).
  • 在改造的聚合物中实现了光交叉链接能力.
  • 证明了改性聚合物作为负光电阻的实用性.

结论:

  • 开发的方法为修改铁电聚合物提供了一种多功能方法.
  • 这种技术有助于将铁电化电活性聚合物集成到电子微型制造中.
  • 该研究强调了通过化学修饰来创造先进的有机电子设备的潜力.