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Polymer blends are mixture of two structurally different polymers bonded together by secondary force. Study of polyblend solutions and multiphase polymer systems are useful for industrial development and solve technical problems and upgrade the products by working with existing materials. In order to utilize polymers to create new multi-component polymer systems the fundamental principles related with their microstructures, solubility, phase separation, thermodynamical properties and degradation must be studied. The molecular interactions study using low amplitude ultrasonic waves retain intrinsic state of polymer solution. The polymers under investigation are perturbed by such waves but no permanent changes are induced. The study of molecular interactions present in the polymer-solvent on one hand and polymer-polymer on the other hand is important as it throws light on the processes involving polymer production and their uses. The present paper deals with ultrasonic velocity, density, measurements performed on solution blends of Polybutadiene (PB) and Poly Methyl Methacrylate (PMMA) in various blend ratios using Tetrahydrofuran (THF) as solvent. Ultrasonic velocity, density measurements are done at 2 MHz frequency and for temperatures 293K, 298K, 303K, 308K and 313K. Thermo-acoustical parameters viz., acoustical impedance (Z), isothermal compressibility (βi), internal pressure (Pi),fractional free volume (f’), Moelwyn-Hughes parameter (C1), Observed absorption (α/f2)obs have been computed from the experimental data. Polybutadiene and Poly Methyl Methacrylate blends were characterized at the molecular level by FTIR spectroscopy. The variation of ultrasonic velocity and other thermo-acoustical parameters shows nonlinear increase or decrease with variation in blend ratio. The nature of polymer-polymer and polymer-solvent interactions and effect of blend ratio on molecular interactions have been studied.
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