Effect of Temperature on Adhesive and Compaction Properties of Some Organic Powders

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  • 2,3の有機粉体の付着凝集性および充填性におよぼす温度の影響
  • 2 3 ノ ユウキ フンタイ ノ フチャク ギョウシュウセイ オヨビ ジュウテ

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The effect of temperature on the compaction behavior and the adhesive properties of methyl and butyl p-hydroxybenzoate (abbreviated as Me-POB and Bu-POB, respectively) powders was studied. The adhesive force at a contact point between two particles (H) determined by tensile strength measurements showed maxima at the value of homologous temperature (ratio of temperature TK to melting point TmK, T/Tm) between 0.94 and 0.96. The value of the compression coefficient (k) in the Kawakita equation, a measure of the ease of powder compaction, remained nearly constant up to about 0.9 of T/Tm. Above 0.9 Tm it increased remarkably, which may be caused by the reduction of friction among particles and between particles and die wall at high temperature. Under given tapping conditions, the initial rate of compaction (v1) decreased and the final porosity (εf) increased with increasing temperature in the range of T/Tm below 0.9. It was thought that the probability of filling the vacant spaces existing in the lower layer of the powder bed with particles diminished as the adhesive force between particles increased. Then, an empirical equation relating εf to both H and impact accerelation α* was presented.

Journal

  • YAKUGAKU ZASSHI

    YAKUGAKU ZASSHI 100 (9), 893-899, 1980

    The Pharmaceutical Society of Japan

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