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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
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Using C-DFT to develop an e-ReaxFF force field for acetophenone radical anion.

Katheryn A Penrod1, Maximiliano Aldo Burgess2, Dooman Akbarian3

  • 1Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, USA.

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|December 9, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed an e-ReaxFF force field to model acetophenone radical anions in cross-linked polyethylene (XLPE) insulation. This advancement aids in understanding XLPE chemistry for reliable high-voltage power transmission.

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Area of Science:

  • Materials Science
  • Computational Chemistry
  • Electrical Engineering

Background:

  • High-voltage power transmission demands reliable insulating materials like cross-linked polyethylene (XLPE).
  • Dicumyl peroxide (DCP) cross-linking is standard for XLPE, but produces by-products like acetophenone.
  • Acetophenone's aromaticity and electron affinity make it a key molecule for study.

Purpose of the Study:

  • To develop an e-ReaxFF force field capable of describing the acetophenone radical anion.
  • To enhance the understanding of XLPE chemistry at a molecular level for improved cable insulation.

Main Methods:

  • Constrained density functional theory (C-DFT) was used to optimize acetophenone structures with a constrained excess electron.
  • e-ReaxFF force field parameters were iteratively fitted against C-DFT energy data.
  • Molecular dynamics simulations using the developed e-ReaxFF force field were compared with DFT spin density data.

Main Results:

  • A new e-ReaxFF force field was successfully developed to model acetophenone radical anions.
  • The force field accurately described electronic distributions, showing good agreement with DFT calculations.
  • The study expanded the e-ReaxFF force field's capability for simulating XLPE chemistry.

Conclusions:

  • The developed e-ReaxFF force field is a significant step towards a comprehensive molecular understanding of XLPE.
  • This research contributes to the design of more reliable insulating materials for high-voltage power cables.
  • Accurate molecular modeling of by-products is crucial for optimizing XLPE performance.