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Estimation of the cure rate of epichlorohydrin/bisphenol a type epoxy resins

Bestimmung des Härtungsgrades von Epoxyharzen vom Typ Epichlorhydrin/Bisphenol A

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Zusammenfassung

Ein neues Verfahren wird beschrieben für Epoxyharze, die mit komplexen Aminen oder Polyamiden gehärtet wurden. Die gemahlenen Harze werden in p-Dioxan suspendiert und 30 min der Reaktion mit überschüssigem, in situ erzeugtem Bromwasserstoff unterworfen. Der Überschuß wird dann potentiometrisch mit Quecksilberperchlorat titriert, wobei eine bromidselektive Indicatorelektrode in Verbindung mit einem pH-Meter mit Skalendehnung benutzt wird. Die Ergebnisse stimmen mit denjenigen überein, die durch Verfolgung des Verschwindens der Oxiran-Absorptionsbande bei 10,95 μm erhalten wurden. Der durchschnittliche Fehler lag bei 0,9%.

Summary

A new method is described for estimating the curing rates of epichlorohydrin/bisphenol A epoxy resins cured with complex amines or polyamides. The ground-up resins are suspended in p-dioxane and reacted for 30 min with an excess of hydrogen bromide generated in situ. The excess halide is then titrated potentiometrically with mercuric perchlorate, using a bromide-selective indicator electrode in conjunction with an expanded-scale pH meter. Results are in agreement with those obtained by following the disappearance of the oxirane absorption band at 10.95 μm. Average error was 0.9%.

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Authors and Affiliations

  1. Lawrence Radiation Laboratory, University of California, 94550, Livermore, California, USA

    Walter Selig & Glendon L. Crossman

Authors
  1. Walter Selig
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  2. Glendon L. Crossman
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Work performed under the auspices of the U.S. Atomic Energy Commission.

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Selig, W., Crossman, G.L. Estimation of the cure rate of epichlorohydrin/bisphenol a type epoxy resins. Z. Anal. Chem. 253, 279–283 (1971). https://doi.org/10.1007/BF00430087

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  • DOI: https://doi.org/10.1007/BF00430087

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