Der Pharma Chemica
Journal for Medicinal Chemistry, Pharmaceutical Chemistry, Pharmaceutical Sciences and Computational Chemistry
ISSN: 0975-413X
Abstract
Spectroscopic Investigation and Molecular Interactions Studies on Styrene-Ethylene-Butylene-Styrene in Toluene and Tetrahydrofuran Solution in Different Concentrations at 303K by Ultrasonic Method
Author(s): Subramanian Ravichandran*, Gheetha and Thangavelu KrithigaUltrasonic velocities and densities have been measured for the Styrene-Ethylene-Butylene–Styrene (SEBS) in Toluene and Tetrahydrofuran (THF) in different concentration at 303 K. Ultrasonic velocity has been measured using single frequency interferometer at 2 MHz (Model F-81). Adiabatic compressibility, intermolecular free length, acoustic impedance, surface tension and other acoustical parameters have been calculated to assess the SEBS-solvent interaction. It is seen that the ultrasonic velocity increases initially with the increase with concentration of SEBS and it reaches minimum value a mole fraction of 0.89527. The increase in velocity with concentrations suggests the increase in cohesive forces due to molecular interactions. The ultrasonic velocity is maximum and molecular free length is minimum at a mole fraction 1.455 of SEBS shows the closer packing molecular structure. These data are discussed with respect to the concentration of styrene-ethylene-butylene–styrene. Non-linear variations of acoustical parameters with concentrations support the strong molecular interactions. This type of molecular interaction is very important in determining the viscous flow properties of dilute polymer solutions. Computation of nonlinearity parameter (B/A) of styrene-ethylene-butylene-styrene in toluene and tetrahydrofuran solution by Hartmann and Ballou relation solution at 303 K is also carried out. The abrupt change in ultrasonic velocity of polymer solutions at a particular concentration of SEBS is primarily due to the molecular interaction between polymeric-solvent molecules. FTIR analysis is also carried out and it confirms the vibrational characteristics of the sample. Some of the absorption peaks at around 3027.42 cm-1, 2924.34 cm-1, 2862.34 cm-1 are representing C-H stretch.
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