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Method Development for Contactless Resonant Cavity Dielectric Spectroscopic Studies of Cellulosic Paper
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Electrical insulated paper from cotton linter.

Houssni El-Saied1, Magda G El-Meligy1, Samar H Mohamed1

  • 1Cellulose and Paper Department, National Research Center, Dokki, Cairo, Egypt.

Carbohydrate Polymers
|April 23, 2014
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Summary

This study enhanced insulated paper from cotton linter with additives. Blending fibers and adding lead sulfate improved dielectric properties, with oil impregnation further increasing the dielectric constant.

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Area of Science:

  • Materials Science
  • Electrical Engineering
  • Polymer Science

Background:

  • Cotton linter paper is a potential material for electrical insulation.
  • Improving dielectric properties is crucial for enhanced insulation performance.

Purpose of the Study:

  • To investigate the effects of additives and treatments on the dielectric properties of cotton linter paper.
  • To enhance the dielectric constant and reduce the power factor of insulated paper.

Main Methods:

  • Prepared insulated paper from cotton linter with additives like glass fiber, polyester fiber, rayon, and lead sulfate.
  • Studied strength properties before and after linseed oil impregnation.
  • Measured dielectric constant (έ) and AC electrical conductivity across frequencies (100 kHz to 3 MHz) at varying temperatures.

Main Results:

  • Blending cotton linter with glass or polyester fibers increased the dielectric constant.
  • Glass fibers significantly lowered the power factor and enhanced dielectric constant.
  • Hydrophilic fibers (rayon, polyester) resulted in low porosity, low density, and high dielectric resistance.
  • Lead sulfate addition improved dielectric constant due to its high dielectric coefficient (>20).
  • Oil-impregnated paper exhibited a higher dielectric constant than untreated paper.

Conclusions:

  • Additives like glass fiber, polyester fiber, and lead sulfate effectively enhance the dielectric properties of cotton linter paper.
  • Linseed oil impregnation further boosts the dielectric constant, making it suitable for advanced insulation applications.
  • The study demonstrates a pathway to engineer high-performance insulating paper through material modification.