Viscosity parameters and energy of activation of dilute aqueous polyvinyl alcohol (PVOH) solutions. | [Journal of Chemical Society of Pakistan • 1988]

Author(s):

1. Noor Ahmad: National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan

2. Inayatullah Khan: National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan

3. Akhtar Saeed: National Centre of Excellence in Physical Chemistry, University of Peshawar, Pakistan

4. Sher Akber: Chemistry Department, University of Baluchistan, Quetta, Pakistan

Abstract:

The viscometric behaviour of aqueous dilute solutions of polyvinyl alcohol (PVOH) of varying polymer concentration (0.1g/dL-1.0g/dL) and temperature (10 780*C) has been studied. Rapid increase in solution viscosity with increase in PVOH concentration are obviously related to polymer nonsphericity and the tendency of molecules to experience extensive nonhydrodynamic interaction. The intrinsic viscosities were obtained by using Huggins equation By applying the Mark-Houwink expression the "viscosity average molecular weight" was determined. Curves were obtained when values of reduced viscosity vs. temperature were plotted except for 0.1 and 0.2g/dL solution where straight lines with negative slopes were attained. The values of pre-exponential factor A and the apparent activation energy of viscous flow Ea were obtained by plotting 1n vs. 1/T.

Page(s): 43-48

DOI: DOI not available

Published: Journal: Journal of Chemical Society of Pakistan, Volume: 10, Issue: 1, Year: 1988

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