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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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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.
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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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Olefin Metathesis Polymerization: Overview01:13

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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.
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Complexation Equilibria: The Chelate Effect01:19

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In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Highly Efficient Doping of Conjugated Polymers Using Multielectron Acceptor Salts.

Gert Krauss1, Adrian Hochgesang1, John Mohanraj1

  • 1Applied Functional Polymers, Macromolecular Chemistry I, University of Bayreuth, Bayreuth, 95440, Germany.

Macromolecular Rapid Communications
|October 2, 2021
PubMed
Summary

New multielectron acceptor (MEA) salts significantly enhance conjugated polymer conductivity. These MEA salts improve doping efficiency and charge carrier concentration compared to traditional single electron acceptors.

Keywords:
dopingelectron transferpolymersradical ionssemiconductors

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Organic Electronics

Background:

  • Chemical doping is crucial for tuning conjugated polymer electronic properties.
  • Existing p-doping methods using single electron acceptors often require high dopant concentrations, limiting efficiency.
  • High dopant concentrations can negatively impact doping efficiency and material performance.

Purpose of the Study:

  • To introduce and investigate multielectron acceptor (MEA) salts as novel dopants for conjugated polymers.
  • To compare the doping efficiency of MEA salts against conventional single electron acceptors.
  • To explore the impact of polymer dielectric properties on doping efficacy.

Main Methods:

  • Synthesis of two novel multielectron acceptor (MEA) salts.
  • Doping of two polymers with varying dielectric properties using MEA salts and single electron acceptors (NOPF6, magic blue).
  • Characterization using ultraviolet photoelectron spectroscopy/X-ray photoelectron spectroscopy (XPS), impedance spectroscopy, density of states analysis, UV-vis-NIR absorption, spectroelectrochemistry, and Raman spectroscopy.

Main Results:

  • The tetracation MEA salt increased conductivity by two orders of magnitude compared to single electron acceptors at the same molar ratio.
  • Charge carrier concentration was quadrupled using MEA salts.
  • A strong dependence of carrier release on polymer polarity was observed.
  • MEA dopants demonstrated higher doping efficacies and achieved high carrier densities at reduced loadings.

Conclusions:

  • Multielectron acceptor (MEA) salts represent a highly efficient doping strategy for conjugated polymers.
  • MEA salts offer improved conductivity and charge carrier concentration at lower dopant concentrations.
  • The findings pave the way for advanced organic electronic materials with enhanced performance.