Pullulan and poly(vinyl alcohol) (PVA) miscibility studies blend through reduced viscosity measurements, refractometry, mechanical properties and SEM analysis. Viscometric measurements were performed at 30 and 40oC using the Ubbelohde viscometer. To test the ultrasonic velocities of different mix compositions, Ultrasonic Interferometric was used. The refractive indices of mixing solutions of different compositions were calculated directly using an Abbe thermostat refractometer containing water circulating at 30 and 40oC. Studies of mechanical properties, refractive index, ultrasonic velocity and density have shown that all of these with PVA content are increased in the blends. However, in the blend method, SEM studies have given an indication of immiscibility. On the basis of viscosity data, ultrasonic velocity and refractive index measurements, pullulan/PVA blends are found to be immiscible at 30 and 40oC over the entire composition range. The above conclusion also supports SEM studies. Overall, especially for the 90/10 composition, pullulan/PVA blends have shown good physical and mechanical properties.
Dr. M. S. Jayaprakash
Department of Chemistry, Sri Siddhartha First Grade College, Tumkur-572105, India.
Department of Chemistry, S.D.M. College of Engineering and Technology, Dharwad-580002, India.
Smt. M. Annapurna
Department of Chemical Engineering, M. S Ramaiah Institute of Technology, Bangalore, India.
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