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ABSTRACT Polymers are playing an important role in all branches of industry. Many remarkable advances in technology have followed exploitation of the properties offered by new polymeric materials like polymer blends, composites, etc. Miscibility studies of Styrene Ethylene Butylene Styrene dissolved in common solvent are carried out in different compositions. Ultrasonic studies provide a wealth of information in understanding the molecular behavior and intermolecular interaction of polymer solvent mixtures. Attempts are made to measure ultrasonic velocity, density and viscosity of Styrene-Ethylene-Butylenes-Styrene in various ratios at 303 K using ultrasonic interferometer (Modal F81, Mittal Enterprises, New Delhi) operating at 2 MHz and Ostwald viscometer. The acoustic parameters adiabatic compressibility (𝛽), intermolecular free path length (𝐿𝑓), acoustic impedance (𝑍), relative association (RA), and relaxation time (𝜏) have been calculated using experimental data in lower and higher concentrations. The variation of these acoustic parameters is explained in terms of solute-solvent molecular interaction in a polymer solution. The results have been interpreted in light of polymer– solvent and polymer–polymer interactions. The presence of hydrogen bonding in the blends has also been studied by FTIR studies. Variations in the compatibility of the blends caused by increases of SEBS and solvents are also ultrasonically studied. Structural changes have been found in the polymer blend systems.
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