© Global Journal Of Pure And Applied Sciences . 2001. Vol. 7 No. 3
Publisher: Bachudo Science Co. Ltd
Sorption, Diffusion and Energetics Properties of Polypropylene Samples In Aromatic Solvent
T. C. Uzomah, I. L. Ibrahim
KEYWORDS: Sorption, permeability, selectivity, interaction, energetics
ABSTRACT:Data on swelling quotient have been used to investigate the sorption and diffusion properties of three aromatic solvents into polypropylene (PP) in the temperature range 28°C-60°C. The initial kinetic data, used to study the transport modes and the degree of PP-solvent interactions showed non-Fickian diffusion mechanism and low interactions respectively. The diffusion properties: diffusivity, solubility and permeability were found to be inversely dependent on the molar volume and enthalpic interaction constant XH but increased with increase in sorption temperature. The energetics of the systems studied exhibited negative values for entropy and enthalpy of sorption for all three solvents, but only in the case, 'PP-benzene system was the free energy very small and negative too.
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