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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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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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Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

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Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
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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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Polymer Classification: Stereospecificity01:26

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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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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
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基于循环德克斯特林聚合物的容器促进聚合诱导排放.

Estefanía Delgado-Pinar1, Gianluca Utzeri2, Artur J M Valente2

  • 1Molecular Science Institute, Inorganic Chemistry Department, University of Valencia, C/Catedrático José Beltrán 2, 46980 Paterna, Valencia, Spain; CQC-IMS, Department of Chemistry, University of Coimbra, Coimbra P-3004-535, Portugal.

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概括

基于环德的聚合物增强了四乙烯 (TPE) 和四-1,3-cyclopentadiene (TPC) 的固态光. 这克服了聚合引起的火,使材料科学及其他领域的应用成为可能.

关键词:
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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
  • 光物理学的光学物理学

背景情况:

  • 聚合引起的灭 (ACQ) 限制了许多有机发光剂的固态光.
  • 四乙烯 (TPE) 和1,2,3,4-四-1,3-cyclopentadiene (TPC) 是已知的发光剂易受ACQ.

研究的目的:

  • 开发一种策略,以提高TPE和TPC的固态光效率,使用基于环极的聚合物.
  • 为了研究聚合物限制对光原体光物理性质的影响.

主要方法:

  • 合成基于循环二烯的聚合物.
  • 通过受控的溶剂运输将TPE和TPC纳入聚合物矩阵.
  • 聚合物交叉连接比率的变化.
  • 形态和光物理特征 (例如,光量子产量测量).

主要成果:

  • 在固态中实现了TPE (60%) 和TPC (81%) 的高光量子产量.
  • 通过聚合物封闭,证明有效地抑制聚合引起的火.
  • 通过调整溶剂和交联比率来展示对材料形态和光物理性质的控制.

结论:

  • 基于环极德的聚合物有效地增强了TPE和TPC等发光剂的固态光.
  • 开发的战略提供了一种方法,可以在没有外部刺激的情况下创建高发光材料.
  • 这些材料在需要强大的固态发光的领域有潜在的应用,例如先进的材料和传感器.