The Effects of Adsorbed Water on Tensile Strength and Young's Modulus of Moldings Determined by Means of a Three-Point Bending Method.

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  • Effects of Adsorbed Water on Tensile Strength and Young s Modulus of Moldings Determined by Means of a Three Point Bending Method

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Young's moduli (E) of three representative tableting excipients and their mix powders were measured for compressed rectangular beam specimens over a range of porosities using a three-point bending technique. We also examined the effects of the amount of water adsorbed on the tensile strentgh of these specimens. The maximal tensile strength (σmax) decreased with increasing water vapor adsorption for microcrystalline cellulose(MCC) and mixed powders of lactose and MCC. σmax increased with increasing compression stress and specimen weitht for all samples. σmax of an α-lactose and cornstarch mixture with a ratio of 7 : 3 showed a large value. Young's modules (E) and the crushing energy (CE) of MCC were larger than those of the other samples.Young's modulus of specimens decreased as the proportion of α-lactose increased.Disintegration time (DT) of tablets comprised of lactose and MCC mixture was much faster than those of tablets comprised of individual powders. This appeared to demonstrate the effect of MCC swelling on the disintegration time of the tablet. The disintegration time of the lactose/cornstarch series increased only when Young's modulus increased sharply.

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