Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures

Du Lei, James Patrick Runt, A. Safari, R. E. Newnham

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

The dielectric properties of 4-[ethyl(2-hydroxyethyl) amino]-4ʹ-nitroazobenzene-poly (methyl methacrylate) mixtures have been investigated in the temperature range from -20 to 150 °C and the frequency range from 0.1 to 100 kHz. It is found that the observed permittivities can be interpreted satisfactorily in terms of heterogeneous mixture models on the basis of a simple interfacial polarization mechanism. The empirical equation of Havriliak and Negami can be fitted to the a relaxation data of the mixtures and the results are in agreement with inferences from normalized loss factor curves. Dielectric and DSC data reveal that the azo dye has a plasticizing effect on PMMA. The relaxation results also show that 20% dye is a critical concentration above which the β relaxation disappears and the relaxation behavior of the composites becomes independent of the dye content.

Original languageEnglish (US)
Pages (from-to)1797-1801
Number of pages5
JournalMacromolecules
Volume20
Issue number8
DOIs
StatePublished - Aug 1 1987

Fingerprint

Azo Compounds
Azo dyes
Polymethyl Methacrylate
Polymethyl methacrylates
Dielectric properties
Coloring Agents
Dyes
Permittivity
Polarization
Composite materials
Temperature

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Inorganic Chemistry
  • Materials Chemistry

Cite this

Lei, D., Runt, J. P., Safari, A., & Newnham, R. E. (1987). Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures. Macromolecules, 20(8), 1797-1801. https://doi.org/10.1021/ma00174a016
Lei, Du ; Runt, James Patrick ; Safari, A. ; Newnham, R. E. / Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures. In: Macromolecules. 1987 ; Vol. 20, No. 8. pp. 1797-1801.
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Lei, D, Runt, JP, Safari, A & Newnham, RE 1987, 'Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures', Macromolecules, vol. 20, no. 8, pp. 1797-1801. https://doi.org/10.1021/ma00174a016

Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures. / Lei, Du; Runt, James Patrick; Safari, A.; Newnham, R. E.

In: Macromolecules, Vol. 20, No. 8, 01.08.1987, p. 1797-1801.

Research output: Contribution to journalArticle

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T1 - Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures

AU - Lei, Du

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AU - Safari, A.

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AB - The dielectric properties of 4-[ethyl(2-hydroxyethyl) amino]-4ʹ-nitroazobenzene-poly (methyl methacrylate) mixtures have been investigated in the temperature range from -20 to 150 °C and the frequency range from 0.1 to 100 kHz. It is found that the observed permittivities can be interpreted satisfactorily in terms of heterogeneous mixture models on the basis of a simple interfacial polarization mechanism. The empirical equation of Havriliak and Negami can be fitted to the a relaxation data of the mixtures and the results are in agreement with inferences from normalized loss factor curves. Dielectric and DSC data reveal that the azo dye has a plasticizing effect on PMMA. The relaxation results also show that 20% dye is a critical concentration above which the β relaxation disappears and the relaxation behavior of the composites becomes independent of the dye content.

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