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Type: Artigo de periódico
Title: Non-crystalline aluminum polyphosphates: Preparation and properties
Author: Lima, ECD
Beppu, MM
Galembeck, F
Valente, JF
Soares, DM
Abstract: Simultaneous admixture of aluminum nitrate, sodium polyphosphate and ammonium hydroxide yields aluminum polyphosphate powders. Preparations were performed following a two-level factorial plan in which the variables were the reagent concentrations. Eight different powders were obtained and characterized by elemental analysis, X-ray diffraction, infrared spectrophotometry, scanning electron microscopy, and thermalconductimetric analysis. The properties of the powders are strongly dependent on their chemical compositions, specially on the P/Al mol ratio. A higher thermal stability is observed when P/Al less than or equal to 1. In the case of P/Al greater than or equal to 1 powder particles sinter at ca. 500 degrees C, and they soften and expand at ca. 700 degrees C yielding closed cell monoliths and powders. Softening temperatures are easily detected by thermalconductimetric analysis.
Subject: aluminum polyphosphate
non crystalline solids
thermalconductimetric analysis
Country: Brasil
Editor: Soc Brasileira Quimica
Rights: aberto
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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