eng Oriental Scientific Publishing Company Material Science Research India 0973-3469 2010-02-19 7 2 443 448 2400 article Viscosity Studies of Polyvinyl Alcohol (PVA, Mw = 1,25,000) in Solvent Distilled Water and Aqueous Solution of Urea S. Panda 1 G.C. Mohanty 2 R.N. Samal 3 G.S. Roy 4 Department of Physics, S.B. Woman's College, Cuttack - 753 001, India. Department of Physics, G.M. (Auto) College, Sambalpur - 768 004, India. Department of Physics, Ravenshaw University, Cuttack - 753 003, India. Plot No. 6, Budheswari Colony, Bhuneswar - 751 006, India.

Reduced viscosity (ηsp/C) and inherent viscosity ln (ηrel/C) of PVA (Mw = 1,25,000) has been calculated by measuring the flow time of polymer solution in solvents like distilled water and 4M Urea at six different tempratures 25° C, 30° C, 35° C, 40° C, 45° C, and 50° C. From exptrapolation of curve (/C) versus C and (ln /C) versus C, thermoviscosity parameters like Huggins’ Constrant (KHl), Kraemer's constant (KHll) and viscosity concentration co-efficient (a2) have been estimated. In aqueous solution (PVA in distilled water), Huggins' relation does not hold good. So a2 = .201[h]2.28 is used; but in aqueous Urea (PVA in 4M Urea), Huggins' relation holds good. Also η =KMα and value of a more for 4M Urea i.e aqueous Urea is better solvent for PVA than distilled water.

 https://www.materialsciencejournal.org/vol7no2/viscosity-studies-of-polyvinyl-alcohol-pva-mw-125000-in-solvent-distilled-water-and-aqueous-solution-of-urea/ Polyvinyl alcohol Distilled water Urea