Acoustical parameters of poly(vinyl pyrrolidone) in N,N-dimethyl formamide solutions

✍ Scribed by K. Chowdoji Rao; S. Venkata Naidu; A. Varada Rajulu

• Publisher: Elsevier Science
• Year: 1990
• Tongue: English
• Weight: 173 KB
• Volume: 26
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(90)90224-r

✦ Synopsis

Ultrasonic velocity, viscosity, density and refractive index measurements have been made for solutions for poly(vinyl pyrrolidone) (PVP; viscosity average molecular weight --40,000) in N,N-dimethyl formamide (DMF) at various concentrations and temperatures. The molar compressibility (ill specific acoustic impedance (Z), Rao number (R), Van der Waals constant (b) and the relaxation strength (r) have been computed. The variations of fl, Z, R and b with concentration at several temperatures have been studied; the solute-solvent interaction for PVP in DMF is confirmed.