58 research outputs found
Miscibility studies of HPMC/PVA blends in water by viscosity, density, refractive index and ultrasonic velocity method
Hydroxy propyl methyl cellulose (HPMC)/polyvinyl alcohol (PVA) blends are edible polymer films used for food packing and directly in foodstuffs. However they are water-soluble in ordinary temperature and have good mechanical properties. The miscibility of HPMC/PVA blend in water was studied by viscosity, ultrasonic velocity, density and refractive index techniques at 30 and 50°C. Using viscosity data, the interaction parameters μ and α were calculated. These values revealed that HPMC/PVA blend is miscible when the HPMC content is more than 60 in the blend at 30 and 50°C. And also the result revealed that the change in temperature has no significant effect on the miscibility of HPMC/PVA polymer blend
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