MOLECULAR INTERACTION OF AQUEOUS DEXTRAN AT DIFFERENT TEMPERATURES AND FREQUENCIES

Abstract

The propagation of ultrasonic waves in aqueous solution of dextran polymers depends on their viscoelastic
behavior and density, which affected significantly with temperature and frequency changes. In this paper, the
density (?) and viscosity (?) of the aqueous dextrane systems were measured at 303K, 3308K, 313K, 318K
and 323 K. Ultrasonic speed was measured at five temperatures ranging from 303 K to 323 K and at
frequencies at 1MHz, 5MHz, 9MHz, and 12MHz, using ultrasonic interferometer. The acoustic parameters
such as free volume, internal pressure, attenuation coefficient, Raos constant and Wadas constant are
determined using the experimental parameters density (?) viscosity (?) and ultrasonic speed (U). The variance
of these parameters with different temperatures and frequencies contributes to the study of inter-molecular
interaction and its constituent power between the solute (dextran 1 percent) and the solvent (distilled water).The
findings in the aqueous dextran solution were viewed in light of structural rearrangement occurring.