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Thermal analysis of disazo pigments

I. Derivatives of l,4-bis(5′-hydroxy-7′-sulpho-2′-naphthyl)-benzenediamine

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Abstract

The differential-thermal and thermogravimetric analysis of eight derivatives of 1,4-bis-(5′-hydroxy-7′-sulpho-2′naphthyl)-benzenediamide showed that these compounds have a marked exothermic effect, with maxima in the temperature range 280–330°C. The derivative of 4-nitroaniline-2-sulphonic acid were found to undergo a blast-like decomposition in the temperature intervals 255–265°C and 285–290°C, which is reflected by large steps in their TG curves.

The thermal analysis of disazo pigments permits determination of their applicability at higher temperatures.

Zusammenfassung

Die DT- und TG- Analyse von acht Derivaten von 1,4-bis-(5′-Hydroxy-7′-sulpho-2′naphthyl)-benzoldiamid zeigte, dass diese Verbindungen mit einem Maximum im Temperaturbereich 280–330°C einen eindeutigen exothermen Effekt aufweisen. Derivate mit 4-Nitroanilin-2-sulfonsäure zeigen eine explosionsartige Zersetzung im Temperaturintervall 255–265°C und 285–290°C, was sich in den TG-Kurven in einer großen Stufe wiederspiegelt.

Die Thermoanalyse von Bisazopigmenten ermöglicht eine Ermittlung ihrer Anwendbarkeit für höhere Temperaturen.

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Authors and Affiliations

  1. Department of Technology of Organic Synthesis and Fuels, Higher Institute of Chemical Technology, 1156, Sofia, Bulgaria

    G. Simeonov, A. Draganov & D. Rustschev

Authors
  1. G. Simeonov
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  2. A. Draganov
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  3. D. Rustschev
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Simeonov, G., Draganov, A. & Rustschev, D. Thermal analysis of disazo pigments. Journal of Thermal Analysis 36, 721–732 (1990). https://doi.org/10.1007/BF01914523

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  • DOI: https://doi.org/10.1007/BF01914523

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