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Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

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Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
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Radical Reactivity: Overview01:11

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Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
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Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
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Radical Formation: Overview01:03

Radical Formation: Overview

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A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
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Radical Formation: Addition00:47

Radical Formation: Addition

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Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
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Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

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Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
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Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Spintronic Pathways in a Nonconjugated Radical Polymer Glass.

Hamas Tahir1, Carsten Flores-Hansen2, Sheng-Ning Hsu1

  • 1Charles D. Davidson School of Chemical Engineering, Purdue University, 480 W. Stadium Ave, West Lafayette, IN, 47907, USA.

Advanced Materials (Deerfield Beach, Fla.)
|November 18, 2024
PubMed
Summary
This summary is machine-generated.

This study demonstrates spin transport in poly(4-glycidyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl) (PTEO), a nonconjugated radical polymer. PTEO exhibits a giant magnetoresistance effect and efficient spin current propagation, highlighting its potential for spintronic applications.

Keywords:
exchange‐biasinverse spin Hall effectmagnetoresistancespintronicsspin‐mixing conductance

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Spintronics

Background:

  • Radical chemistries are gaining attention for applications in organic electronics, optoelectronics, and magneto-responsive systems.
  • The spin-transport capabilities of magnetically active glassy polymers have remained largely unexplored.

Purpose of the Study:

  • To investigate the spin-transport characteristics of the radical polymer poly(4-glycidyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl) (PTEO).
  • To demonstrate sustained spin-selective currents and analyze magnetoresistance effects in PTEO-based devices.

Main Methods:

  • Incorporation of PTEO into device geometries with magnetically polarized electrodes.
  • Annealing of PTEO thin films above their glass transition temperature.
  • Ferromagnetic resonance spin-pumping measurements at the NiFe/PTEO interface.

Main Results:

  • PTEO enables sustained spin-selective currents.
  • A giant magnetoresistance (MR) effect of approximately 80% was observed at 4 K after annealing.
  • A large effective spin-mixing conductance of 1.18 × 10^19 m^-2 was measured at the NiFe/PTEO interface.
  • Effective propagation of pure spin currents through PTEO with a spin diffusion length of 90.4 nm was achieved in NiFe/PTEO/Pd multilayer devices.

Conclusions:

  • This work presents the first demonstration of spin transport in a nonconjugated radical polymer.
  • PTEO exhibits promising spin-transporting potential, with performance comparable to conventional doped conjugated polymers and surpassing inorganic/metallic systems.
  • The findings underscore the potential of radical polymers for advanced spintronic applications.