Abstract
AbstractCompression and stress relaxation data from powder mixtures of Avicel and paracetamol have been analysed using the David and Augsburger Maxwell model treatment and the Heckel, Kawakita and Shott equations. Scanning electron microscopy was further used to characterise the compacts. No direct relationship was found between the 1/k value of the Heckel plots, and the 1/B value of the Kawakita equations. However, the compaction mechanism of a material can be elucidated more readily if both methods are used together. The slope n of the Shott plot was shown to be a useful parameter for measuring the amount of stress relaxation and the rate of stress decay. The use of David & Augsburger's equation was limited to certain materials, which undergo Maxwell deformation. For binary system and those materials showing deviation from the David & Augsburger equation, a more sophisticated model is required for describing the deformation process.
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