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

Du Lei; J. Runt; A. Safari; R. E. Newnham

doi:10.1021/ma00174a016

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

Du Lei, J. Runt, A. Safari, R. E. Newnham

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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 language	English (US)
Pages (from-to)	1797-1801
Number of pages	5
Journal	Macromolecules
Volume	20
Issue number	8
DOIs	https://doi.org/10.1021/ma00174a016
State	Published - Aug 1 1987

All Science Journal Classification (ASJC) codes

Organic Chemistry
Polymers and Plastics
Inorganic Chemistry
Materials Chemistry

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title = "Dielectric Properties of Azo Dye-Poly(methyl methacrylate) Mixtures",

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.",

author = "Du Lei and J. Runt and A. Safari and Newnham, {R. E.}",

year = "1987",

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TY - JOUR

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

AU - Lei, Du

AU - Runt, J.

AU - Safari, A.

AU - Newnham, R. E.

PY - 1987/8/1

Y1 - 1987/8/1

N2 - 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.

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

Abstract

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