Preparation Of Porous Hydroxyapatite Via Polymeric Sponge Method

Azleha, Daud (2011) Preparation Of Porous Hydroxyapatite Via Polymeric Sponge Method. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Polymeric sponge method is a method that used to prepare porous hydroxyapatite sample by using commercial hydroxyapatite powder. The effects of sintering rate, stirring time and hydroxyapatite concentration on porosity, compressive strength, crystallinity of the porous bodies, microstructure, molecular and bonding and temperature will be studied. It is expected that increasing of powder loading in slurry composition will result in higher densities and increase of compressive strength of the porous hydroxyapatite bodies. However, the optimum composition of hydroxyapatite loading will be investigated during this study as if the concentration of hydroxyapatite powder in the slurry is too high it will produce slurry with high viscosity which leading to difficulty in impregnating the cellulosic sponge. On the other hand, if the hydroxyapatite concentration in the slurry is too low, the number of hydroxyapatite particles will be less resulting in lower compressive strength and low density. Heating rate of sintering process of porous hydroxyapatite also will be covered in this study. It is expected that slow heating rate will give better properties of porous hydroxyapatite in terms of density, compressive strength and crystallinity compared to faster heating. In this study, increase in the powder loading was resulted in increase of apparent density from 0.37 g/cm3 to 0.66 g/cm3 and crystallinity. The study found that powder loading of 75% is the optimum composition of hydroxyapatite. For the sintering rate, results obtained show the slower sintering give higher apparent density of 0.48 g/cm3 and crystallinity than faster sintering rate. A longer stirring time also yielded the same results as slower sintering rate where it resulted in higher apparent density and crystallinity.

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