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  4. Influence of sodium bromide on the thermal decomposition of tetraphenylphosphonium montmorillonite
 
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2011
Journal Article
Title

Influence of sodium bromide on the thermal decomposition of tetraphenylphosphonium montmorillonite

Abstract
Tetraphenylphosphonium montmorillonite (TPP-MMT) was prepared from an aqueous solution of tetraphenylphosphonium bromide and a bentonite consisting primarily of sodium rich montmorillonite (Na-MMT) together with minor amounts of cristobalite, quartz and nontronite. The original bentonite, the TPP-MMT and mixtures of TPP-MMT with various amounts of NaBr were investigated by in-situ high-temperature X-ray diffraction and thermogravimetric analysis. The decomposition of TPP-MMT was strongly dependent on the presence of NaBr. NaBr took part in a retro-reaction to Na-MMT+TPP-Br, of which the latter decomposed into gaseous products. The decomposition temperature of pure TPP-MMT was about 100°C higher than mixtures of TPP-MMT with NaBr. The TPP-ions in pure TPP-MMT decomposed continuously within the MMT interlayer space, so that there was probably nothing left but H+. Since NaBr is a by-product of the TPP-MMT synthesis from Na-MMT and since halogen ions strongly influence fire retardant properties of polymer-based composites, this reaction is a critical aspect in the evaluation of such materials. Cristobalite and quartz were inert during the reactions observed up to temperatures of 1000°C.
Author(s)
Birkenstock, J.
Kleemeier, M.
Vogt, C.
Wendschuh, M.
Hartwig, A.
Fischer, R.X.
Journal
Applied Clay Science  
DOI
10.1016/j.clay.2011.07.021
Language
English
Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung IFAM  
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