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Related Concept Videos

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene01:13

Electrophilic Aromatic Substitution: Fluorination and Iodination of Benzene

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Bromination and chlorination of aromatic rings by electrophilic aromatic substitution reactions are easily achieved, but fluorination and iodination are difficult to achieve. Fluorine is so reactive that its reaction with benzene is difficult to control, resulting in poor yields of monofluoroaromatic products. To address this, Selectfluor reagent is used as a fluorine source in which a fluorine atom is bonded to a positively charged nitrogen.
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The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the...
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Related Experiment Video

Updated: Apr 18, 2026

Reductive Electropolymerization of a Vinyl-containing Poly-pyridyl Complex on Glassy Carbon and Fluorine-doped Tin Oxide Electrodes
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Fluorinated aromatic polyimides as high-performance electret materials.

Dominik P Erhard1, Florian Richter, Christian B A Bartz

  • 1Makromolekulare Chemie I, Bayreuther Institut für Makromolekülforschung (BIMF) and Bayreuther Zentrum für Kolloide und Grenzflächen (BZKG), 95440, Bayreuth, Germany.

Macromolecular Rapid Communications
|January 20, 2015
PubMed
Summary
This summary is machine-generated.

New aromatic polyimides offer durable electret performance at high temperatures. A specific polyimide with hexafluoroisopropylidene groups shows excellent charge stability and thermal resistance for advanced electronic devices.

Keywords:
aromatic polyimidescharge stabilitycorona chargingpolymer electretsstructure-property relations

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Electrical Engineering

Background:

  • Polymer electret materials are crucial for technology-driven devices like microelectromechanical systems and organic field-effect transistors.
  • Conventional polymer electrets degrade at elevated temperatures, limiting their application range.
  • There is a growing need for polymer electrets with stable performance across a wide temperature spectrum.

Purpose of the Study:

  • To develop advanced aromatic polyimides with enhanced electret performance at high temperatures.
  • To investigate the impact of fluorosubstitution degree on the electret stability of polyimides.
  • To identify polyimide structures suitable for demanding electronic device applications.

Main Methods:

  • Synthesis of a series of aromatic polyimides with varying degrees of fluorosubstitution.
  • Isothermal surface potential decay measurements at elevated temperatures.
  • Evaluation of charge storage stability and thermal endurance.

Main Results:

  • Minor chemical structure variations significantly influence electret behavior.
  • The polyimide incorporating a hexafluoroisopropylidene moiety in both bisanhydride and diamine units exhibited superior performance.
  • This optimized polyimide retained 94% of its initial surface charge after 24 hours at 120 °C.
  • It demonstrated remarkable thermal stability, tolerating short-term exposure to 300 °C with minimal performance loss.

Conclusions:

  • The developed fluorinated aromatic polyimide offers excellent long-term electret stability at elevated temperatures.
  • This material is highly suitable for applications requiring high thermal stability during device fabrication and operation.
  • The findings pave the way for advanced polymer electrets in high-temperature electronic devices.